- Gene therapy and newer therapeutic options have significantly changed the landscape for inherited retinal diseases (IRDs) over the last decade. Previously considered untreatable, IRDs now have testing and treatment options available.
- Advances include widespread availability of low-cost genetic testing to identify causal mutations, numerous clinical trials exploring gene therapy and cell therapy, and the first FDA-approved gene therapy treatment.
- While challenges remain, such as high costs and limited treatment for advanced disease, the future is promising with prospects for personalized medicine using gene editing and stem cells. Pursuing a career in IRDs offers exciting opportunities as the field continues to rapidly progress.
This document discusses Retinitis Pigmentosa (RP), a group of inherited retinal disorders characterized by progressive dysfunction of rod photoreceptors and subsequent degeneration of cone photoreceptors. It causes night blindness and visual field loss. RP has several subtypes and can be inherited in autosomal dominant, recessive or X-linked patterns. Diagnosis involves visual field testing, electroretinography and fundus examination. There is no cure but vitamin supplements and low vision aids can help manage symptoms.
This document discusses retinoblastoma, a rare eye cancer that affects children. It is the most common intraocular malignancy in childhood. If untreated, children typically die within 2-4 years of symptoms starting. The document covers epidemiology, genetics, clinical presentation, diagnosis, and management options like chemotherapy, radiation therapy, cryotherapy, laser therapy, and enucleation. Early detection and a multidisciplinary approach can help save the child's life and possibly preserve vision. Prognosis depends on factors like tumor size and extent of spread.
Retinal dystrophies are a group of degenerative retinal disorders with genetic and clinical heterogeneity. They can affect rods, cones, or both photoreceptors. Retinitis pigmentosa is the most common form of inherited retinal dystrophy and is characterized by rod degeneration followed by cone loss. It presents with night blindness, progressive peripheral vision loss, attenuation of retinal vessels, waxy pallor of the optic disc, and bone spicule pigmentation. Electroretinography shows a rod-cone pattern of dysfunction. Genetic testing can identify mutations in over 270 associated genes.
This document provides an overview of retinopathy of prematurity (ROP), including:
1) ROP is a proliferative retinopathy affecting premature infants that can cause lifelong visual impairment.
2) The development of the retinal vasculature is disrupted in premature infants due to their early exposure to a hyperoxic extra-uterine environment.
3) Laser photocoagulation treatment is recommended for high-risk pre-threshold and threshold ROP to ablate the peripheral avascular retina and prevent retinal detachment and blindness.
This document provides an overview of proliferative vitreoretinopathy (PVR). It defines PVR as a fibrotic wound healing response involving proliferation of cells that can cause retinal traction and detachment. The pathophysiology involves epithelial-mesenchymal transition of retinal pigment epithelium cells and proliferation of glial cells, which secrete extracellular matrix proteins. Growth factors and cytokines promote proliferation and contraction of fibrocellular membranes. Risk factors include retinal detachment, inflammation, and previous vitreoretinal surgery. Early diagnosis and timely surgery aiming to relieve traction and reattach the retina are important for treatment.
This document summarizes Advanced Cell Technology's (ACT) business, including its patented stem cell technologies, therapeutic programs, clinical trials, intellectual property, management team, and financial information. ACT is developing stem cell-based therapies for retinal diseases like Stargardt's Macular Dystrophy and dry age-related macular degeneration. It has patented technologies for producing human embryonic stem cells without embryo destruction and differentiating them into retinal pigment epithelium cells. ACT has FDA approval to conduct Phase I/II clinical trials in the US and plans to initiate trials in Europe to treat these retinal diseases using stem cell-derived RPE cells.
Retinoblastoma is a rare form of eye cancer that affects young children. It occurs when nerve cells in the retina develop genetic mutations causing uncontrolled growth. In about 40% of cases it is inherited from a parent with a faulty gene. Symptoms include a white pupil, eye misalignment, poor vision, and eye swelling/redness. Treatment aims to preserve the child's life, then vision, and minimize side effects. Options include thermotherapy, laser photocoagulation, and cryotherapy. Children also face risks of cancer recurrence or developing other cancers.
This document discusses Retinitis Pigmentosa (RP), a group of inherited retinal disorders characterized by progressive dysfunction of rod photoreceptors and subsequent degeneration of cone photoreceptors. It causes night blindness and visual field loss. RP has several subtypes and can be inherited in autosomal dominant, recessive or X-linked patterns. Diagnosis involves visual field testing, electroretinography and fundus examination. There is no cure but vitamin supplements and low vision aids can help manage symptoms.
This document discusses retinoblastoma, a rare eye cancer that affects children. It is the most common intraocular malignancy in childhood. If untreated, children typically die within 2-4 years of symptoms starting. The document covers epidemiology, genetics, clinical presentation, diagnosis, and management options like chemotherapy, radiation therapy, cryotherapy, laser therapy, and enucleation. Early detection and a multidisciplinary approach can help save the child's life and possibly preserve vision. Prognosis depends on factors like tumor size and extent of spread.
Retinal dystrophies are a group of degenerative retinal disorders with genetic and clinical heterogeneity. They can affect rods, cones, or both photoreceptors. Retinitis pigmentosa is the most common form of inherited retinal dystrophy and is characterized by rod degeneration followed by cone loss. It presents with night blindness, progressive peripheral vision loss, attenuation of retinal vessels, waxy pallor of the optic disc, and bone spicule pigmentation. Electroretinography shows a rod-cone pattern of dysfunction. Genetic testing can identify mutations in over 270 associated genes.
This document provides an overview of retinopathy of prematurity (ROP), including:
1) ROP is a proliferative retinopathy affecting premature infants that can cause lifelong visual impairment.
2) The development of the retinal vasculature is disrupted in premature infants due to their early exposure to a hyperoxic extra-uterine environment.
3) Laser photocoagulation treatment is recommended for high-risk pre-threshold and threshold ROP to ablate the peripheral avascular retina and prevent retinal detachment and blindness.
This document provides an overview of proliferative vitreoretinopathy (PVR). It defines PVR as a fibrotic wound healing response involving proliferation of cells that can cause retinal traction and detachment. The pathophysiology involves epithelial-mesenchymal transition of retinal pigment epithelium cells and proliferation of glial cells, which secrete extracellular matrix proteins. Growth factors and cytokines promote proliferation and contraction of fibrocellular membranes. Risk factors include retinal detachment, inflammation, and previous vitreoretinal surgery. Early diagnosis and timely surgery aiming to relieve traction and reattach the retina are important for treatment.
This document summarizes Advanced Cell Technology's (ACT) business, including its patented stem cell technologies, therapeutic programs, clinical trials, intellectual property, management team, and financial information. ACT is developing stem cell-based therapies for retinal diseases like Stargardt's Macular Dystrophy and dry age-related macular degeneration. It has patented technologies for producing human embryonic stem cells without embryo destruction and differentiating them into retinal pigment epithelium cells. ACT has FDA approval to conduct Phase I/II clinical trials in the US and plans to initiate trials in Europe to treat these retinal diseases using stem cell-derived RPE cells.
Retinoblastoma is a rare form of eye cancer that affects young children. It occurs when nerve cells in the retina develop genetic mutations causing uncontrolled growth. In about 40% of cases it is inherited from a parent with a faulty gene. Symptoms include a white pupil, eye misalignment, poor vision, and eye swelling/redness. Treatment aims to preserve the child's life, then vision, and minimize side effects. Options include thermotherapy, laser photocoagulation, and cryotherapy. Children also face risks of cancer recurrence or developing other cancers.
Retinoblastoma is a cancer of the retina that develops from mutations in the RB1 gene. It is the most common eye cancer in children. Treatment involves various modalities like chemotherapy, thermotherapy, cryotherapy, brachytherapy, or external beam radiotherapy to preserve vision and the eye if possible. Enucleation is recommended if over 50% of the eye is involved or there is suspicion of extraocular extension. Retinoblastoma management aims to preserve life first, then the eye, and vision.
This document provides an overview of recent updates to the WHO classification of central nervous system tumors based on the 2016 guidelines. Key points include:
- Incorporation of molecular parameters like IDH, ATRX, and 1p/19q status into tumor classifications to improve diagnostic accuracy.
- Diffuse gliomas are now classified based on shared genetic drivers rather than histology alone. Entities like oligoastrocytoma are discouraged.
- Newly recognized entities include epithelioid glioblastoma and glioblastoma with a primitive neuronal component showing MYC/MYCN amplification.
- The diagnosis of oligodendroglioma now requires both IDH mutation and 1p/
The document summarizes Advanced Cell Technology's (ACT's) regenerative medicine programs focused on treating ocular diseases. ACT is conducting clinical trials using human embryonic stem cell-derived retinal pigment epithelial cells to treat dry age-related macular degeneration and Stargardt's disease. The company is also developing stem cell-based therapies for corneal diseases and ischemic retinopathies using hemangioblast cells and retinal neural progenitors. ACT has a strong intellectual property portfolio and balance sheet to support its clinical trials and product development programs.
Exudative retinal detachment develops when fluid collects in the subretinal space.
The subretinal space between the photoreceptors and the retinal pigment epithelium is the remnant of the embryonic optic vesicle.
In the developed eye the subretinal space is of minimal size, but it can reopen under pathological conditions that disrupt the integrity of blood-retinal barrier.
Inflammatory, infectious, infiltrative, neoplastic, vascular, and degenerative conditions may be associated with blood-retinal barrier breakdown and the sequential development of exudative retinal detachment.
This elaborate on the pathogenesis and the differential diagnosis of exudative retinal detachment and specifically discuss the spectrum of diseases associated with exudative retinal detachment in uveitis clinics.
This document discusses pediatric cataract and leucocoria (white pupil). It defines leucocoria as a white reflection seen in the pupil that could indicate an underlying condition like cataract, retinoblastoma, or persistent hyperplastic primary vitreous. The document outlines the causes, presentations, classifications, management, and visual prognosis of pediatric cataracts. It emphasizes the importance of early referral for any detected leucocoria to rule out retinoblastoma or other serious conditions and prevent amblyopia. Overall management of pediatric cataracts aims to restore vision through early surgery and amblyopia treatment for the best possible visual outcomes.
This document provides information on macular dystrophies. It begins with the anatomical landmarks of the macula including the fovea and foveola. It then discusses various hereditary macular dystrophies including X-linked juvenile retinoschisis, Stargardt's disease, Best's disease, dominant familial drusen, and pattern dystrophy. For each condition, it provides information on genetics, symptoms, signs, imaging findings, and management. The document uses images to illustrate many of the clinical features described.
This document provides an overview of Advanced Cell Technology's (ACT) regenerative medicine programs and pipeline. ACT is developing cell therapy products for ophthalmology using retinal pigment epithelial (RPE) cells and retinal neural progenitor cells derived from pluripotent stem cells. ACT has completed Phase I clinical trials of RPE cells for dry age-related macular degeneration and Stargardt's macular dystrophy with no adverse events reported and signs of visual improvement. The company is also developing mesenchymal stem cells for treating autoimmune and inflammatory diseases. ACT has a robust intellectual property portfolio and is led by an experienced management team and board of directors.
Gene therapy is a type of treatment that inserts healthy genes into cells to replace mutated genes causing disease. Several gene therapies have been approved to treat various cancers, viral infections, and inherited disorders. Approved therapies work by using viruses to insert healthy genes, interfering with faulty genes, or modifying cells before reintroducing them. Currently, viral vectors provide higher gene delivery efficiency but are more toxic and immunogenic than non-viral systems, which are being improved through novel design strategies.
All you need to know about amd and the oct but were afraid to askTheEyeExpert
1. The document discusses optical coherence tomography (OCT) and age-related macular degeneration (AMD), including OCT principles, anatomy, and pathology seen in AMD.
2. OCT provides high-resolution cross-sectional images of the retina, allowing evaluation of layer-specific pathology. Changes seen on OCT can help predict visual function in conditions like AMD.
3. Wet AMD is characterized by abnormal blood vessel growth, which OCT can detect as fluid, hemorrhage, or scar tissue within retinal layers. Dry AMD appears on OCT as deposits under the retinal pigment epithelium or geographic atrophy of this layer.
Macular degeneration treatments - an update for orthoptists TheEyeExpert
This document summarizes treatment options for macular degeneration. It begins with an overview of retinal anatomy and causes of macular degeneration related to light damage and age-related impaired recycling in the retina. It then discusses current treatments for wet macular degeneration which involve injections of anti-VEGF drugs like Lucentis or Eylea every 1-3 months on average. Future developments may reduce injection frequency through radiation treatments or more potent drugs. Dry macular degeneration has fewer treatment options and focuses on low vision aids and nutritional supplements. The document reviews imaging techniques, costs of treatment, injection procedures, and other macular conditions.
Richard Trevino presented four cases involving posterior segment pathology:
1) A case of torpedo maculopathy with its characteristic appearance and no treatment required.
2) Multiple CHRPE-like lesions in a child, which can signal familial adenomatous polyposis requiring colonoscopy.
3) Recurrent branch retinal artery occlusions in a young woman, which may indicate Susac's syndrome and require hearing and MRI evaluation.
4) An isolated cotton wool spot in a woman on birth control pills, which led to discontinuing the pills and testing for conditions like diabetes, lupus, and Lyme disease that can cause vascular occlusions.
This document discusses retinoblastoma, a rare form of eye cancer that affects children. It is caused by mutations in the RB1 gene and can be hereditary or non-hereditary. Symptoms include white pupil reflex and strabismus. Diagnosis involves examinations like indirect ophthalmoscopy and imaging like ultrasound, CT, and MRI. Treatment depends on tumor staging and may include focal therapies like thermotherapy, chemotherapy, radiation, or enucleation. Prognosis is generally good if caught early but risks include secondary cancers and recurrence so lifelong follow-up is important. Genetic counseling is also critical given hereditary risks for family members.
This document summarizes ACT's ocular programs, which include developing treatments for retinal diseases using stem cell-derived retinal pigment epithelial (RPE) cells, corneal endothelial cells, hemangioblasts, and retinal neural progenitor cells. The programs are at various stages, with RPE cell therapy in clinical trials for dry age-related macular degeneration and Stargardt's disease. Preliminary results show RPE cells attaching and persisting with no signs of rejection. ACT aims to advance these programs to address major causes of blindness.
Gene therapy is an experimental technique that uses genes to treat or prevent disease. It works by inserting a normal gene to replace a defective gene that is causing disease. Researchers are studying gene therapy for diseases like cancer, HIV, hemophilia, blindness, and Parkinson's disease. There are two main types - germline gene therapy, which results in permanent changes that can be inherited, and somatic gene therapy, which only affects the patient. Gene delivery methods include viral vectors like retroviruses and adenoviruses, as well as non-viral methods using physical approaches or chemical carriers like liposomes and polymers. Some successful applications of gene therapy include treating blindness and reducing Parkinson's disease symptoms.
Gene therapy involves genetically modifying cells to treat or alleviate disease. The first approved gene therapy in 1990 treated a child with ADA-SCID. Since then, research has focused on improving delivery methods and targeting different cell types and diseases. Recent successes include using gene therapy to cure blindness caused by a specific genetic condition and reduce Parkinson's disease symptoms. However, challenges remain regarding safety and achieving long-term effects.
- Retinoblastoma is a rare cancer of the retina that usually develops in young children. It can occur unilaterally or bilaterally.
- If left untreated, it is almost always fatal. Early diagnosis and treatment are important to save the child's life and preserve vision.
- Retinoblastoma is caused by a mutation in the RB1 tumor suppressor gene. It can be inherited or sporadic. Inherited retinoblastoma tends to be bilateral and occur at an earlier age.
- Treatment involves chemotherapy, focal therapies like cryotherapy or photocoagulation, and enucleation depending on severity and chance of vision preservation. The goal is to cure the cancer while minimizing side
This particular slides consist of- what is Pneumothorax,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is a summary of Pneumothorax:
Pneumothorax, also known as a collapsed lung, is a condition that occurs when air leaks into the space between the lung and chest wall. This air buildup puts pressure on the lung, preventing it from expanding fully when you breathe. A pneumothorax can cause a complete or partial collapse of the lung.
Retinoblastoma is a cancer of the retina that develops from mutations in the RB1 gene. It is the most common eye cancer in children. Treatment involves various modalities like chemotherapy, thermotherapy, cryotherapy, brachytherapy, or external beam radiotherapy to preserve vision and the eye if possible. Enucleation is recommended if over 50% of the eye is involved or there is suspicion of extraocular extension. Retinoblastoma management aims to preserve life first, then the eye, and vision.
This document provides an overview of recent updates to the WHO classification of central nervous system tumors based on the 2016 guidelines. Key points include:
- Incorporation of molecular parameters like IDH, ATRX, and 1p/19q status into tumor classifications to improve diagnostic accuracy.
- Diffuse gliomas are now classified based on shared genetic drivers rather than histology alone. Entities like oligoastrocytoma are discouraged.
- Newly recognized entities include epithelioid glioblastoma and glioblastoma with a primitive neuronal component showing MYC/MYCN amplification.
- The diagnosis of oligodendroglioma now requires both IDH mutation and 1p/
The document summarizes Advanced Cell Technology's (ACT's) regenerative medicine programs focused on treating ocular diseases. ACT is conducting clinical trials using human embryonic stem cell-derived retinal pigment epithelial cells to treat dry age-related macular degeneration and Stargardt's disease. The company is also developing stem cell-based therapies for corneal diseases and ischemic retinopathies using hemangioblast cells and retinal neural progenitors. ACT has a strong intellectual property portfolio and balance sheet to support its clinical trials and product development programs.
Exudative retinal detachment develops when fluid collects in the subretinal space.
The subretinal space between the photoreceptors and the retinal pigment epithelium is the remnant of the embryonic optic vesicle.
In the developed eye the subretinal space is of minimal size, but it can reopen under pathological conditions that disrupt the integrity of blood-retinal barrier.
Inflammatory, infectious, infiltrative, neoplastic, vascular, and degenerative conditions may be associated with blood-retinal barrier breakdown and the sequential development of exudative retinal detachment.
This elaborate on the pathogenesis and the differential diagnosis of exudative retinal detachment and specifically discuss the spectrum of diseases associated with exudative retinal detachment in uveitis clinics.
This document discusses pediatric cataract and leucocoria (white pupil). It defines leucocoria as a white reflection seen in the pupil that could indicate an underlying condition like cataract, retinoblastoma, or persistent hyperplastic primary vitreous. The document outlines the causes, presentations, classifications, management, and visual prognosis of pediatric cataracts. It emphasizes the importance of early referral for any detected leucocoria to rule out retinoblastoma or other serious conditions and prevent amblyopia. Overall management of pediatric cataracts aims to restore vision through early surgery and amblyopia treatment for the best possible visual outcomes.
This document provides information on macular dystrophies. It begins with the anatomical landmarks of the macula including the fovea and foveola. It then discusses various hereditary macular dystrophies including X-linked juvenile retinoschisis, Stargardt's disease, Best's disease, dominant familial drusen, and pattern dystrophy. For each condition, it provides information on genetics, symptoms, signs, imaging findings, and management. The document uses images to illustrate many of the clinical features described.
This document provides an overview of Advanced Cell Technology's (ACT) regenerative medicine programs and pipeline. ACT is developing cell therapy products for ophthalmology using retinal pigment epithelial (RPE) cells and retinal neural progenitor cells derived from pluripotent stem cells. ACT has completed Phase I clinical trials of RPE cells for dry age-related macular degeneration and Stargardt's macular dystrophy with no adverse events reported and signs of visual improvement. The company is also developing mesenchymal stem cells for treating autoimmune and inflammatory diseases. ACT has a robust intellectual property portfolio and is led by an experienced management team and board of directors.
Gene therapy is a type of treatment that inserts healthy genes into cells to replace mutated genes causing disease. Several gene therapies have been approved to treat various cancers, viral infections, and inherited disorders. Approved therapies work by using viruses to insert healthy genes, interfering with faulty genes, or modifying cells before reintroducing them. Currently, viral vectors provide higher gene delivery efficiency but are more toxic and immunogenic than non-viral systems, which are being improved through novel design strategies.
All you need to know about amd and the oct but were afraid to askTheEyeExpert
1. The document discusses optical coherence tomography (OCT) and age-related macular degeneration (AMD), including OCT principles, anatomy, and pathology seen in AMD.
2. OCT provides high-resolution cross-sectional images of the retina, allowing evaluation of layer-specific pathology. Changes seen on OCT can help predict visual function in conditions like AMD.
3. Wet AMD is characterized by abnormal blood vessel growth, which OCT can detect as fluid, hemorrhage, or scar tissue within retinal layers. Dry AMD appears on OCT as deposits under the retinal pigment epithelium or geographic atrophy of this layer.
Macular degeneration treatments - an update for orthoptists TheEyeExpert
This document summarizes treatment options for macular degeneration. It begins with an overview of retinal anatomy and causes of macular degeneration related to light damage and age-related impaired recycling in the retina. It then discusses current treatments for wet macular degeneration which involve injections of anti-VEGF drugs like Lucentis or Eylea every 1-3 months on average. Future developments may reduce injection frequency through radiation treatments or more potent drugs. Dry macular degeneration has fewer treatment options and focuses on low vision aids and nutritional supplements. The document reviews imaging techniques, costs of treatment, injection procedures, and other macular conditions.
Richard Trevino presented four cases involving posterior segment pathology:
1) A case of torpedo maculopathy with its characteristic appearance and no treatment required.
2) Multiple CHRPE-like lesions in a child, which can signal familial adenomatous polyposis requiring colonoscopy.
3) Recurrent branch retinal artery occlusions in a young woman, which may indicate Susac's syndrome and require hearing and MRI evaluation.
4) An isolated cotton wool spot in a woman on birth control pills, which led to discontinuing the pills and testing for conditions like diabetes, lupus, and Lyme disease that can cause vascular occlusions.
This document discusses retinoblastoma, a rare form of eye cancer that affects children. It is caused by mutations in the RB1 gene and can be hereditary or non-hereditary. Symptoms include white pupil reflex and strabismus. Diagnosis involves examinations like indirect ophthalmoscopy and imaging like ultrasound, CT, and MRI. Treatment depends on tumor staging and may include focal therapies like thermotherapy, chemotherapy, radiation, or enucleation. Prognosis is generally good if caught early but risks include secondary cancers and recurrence so lifelong follow-up is important. Genetic counseling is also critical given hereditary risks for family members.
This document summarizes ACT's ocular programs, which include developing treatments for retinal diseases using stem cell-derived retinal pigment epithelial (RPE) cells, corneal endothelial cells, hemangioblasts, and retinal neural progenitor cells. The programs are at various stages, with RPE cell therapy in clinical trials for dry age-related macular degeneration and Stargardt's disease. Preliminary results show RPE cells attaching and persisting with no signs of rejection. ACT aims to advance these programs to address major causes of blindness.
Gene therapy is an experimental technique that uses genes to treat or prevent disease. It works by inserting a normal gene to replace a defective gene that is causing disease. Researchers are studying gene therapy for diseases like cancer, HIV, hemophilia, blindness, and Parkinson's disease. There are two main types - germline gene therapy, which results in permanent changes that can be inherited, and somatic gene therapy, which only affects the patient. Gene delivery methods include viral vectors like retroviruses and adenoviruses, as well as non-viral methods using physical approaches or chemical carriers like liposomes and polymers. Some successful applications of gene therapy include treating blindness and reducing Parkinson's disease symptoms.
Gene therapy involves genetically modifying cells to treat or alleviate disease. The first approved gene therapy in 1990 treated a child with ADA-SCID. Since then, research has focused on improving delivery methods and targeting different cell types and diseases. Recent successes include using gene therapy to cure blindness caused by a specific genetic condition and reduce Parkinson's disease symptoms. However, challenges remain regarding safety and achieving long-term effects.
- Retinoblastoma is a rare cancer of the retina that usually develops in young children. It can occur unilaterally or bilaterally.
- If left untreated, it is almost always fatal. Early diagnosis and treatment are important to save the child's life and preserve vision.
- Retinoblastoma is caused by a mutation in the RB1 tumor suppressor gene. It can be inherited or sporadic. Inherited retinoblastoma tends to be bilateral and occur at an earlier age.
- Treatment involves chemotherapy, focal therapies like cryotherapy or photocoagulation, and enucleation depending on severity and chance of vision preservation. The goal is to cure the cancer while minimizing side
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This particular slides consist of- what is Pneumothorax,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is a summary of Pneumothorax:
Pneumothorax, also known as a collapsed lung, is a condition that occurs when air leaks into the space between the lung and chest wall. This air buildup puts pressure on the lung, preventing it from expanding fully when you breathe. A pneumothorax can cause a complete or partial collapse of the lung.
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2. TOPICS FOR DISCUSSION
• Basics and Approach to IRDs
• Review of gene therapy in retinal diseases
• Newer therapeutic options for IRDs
• How the landscape of inherited retinal degeneration has shifted
3. BASICS OF IRDs
• Inherited retinal diseases:
• Phenotypically diverse – typically affect structure and function of outer retina
• Various genetic mutations
• Overall rare but an important class of diseases
• Most common cause of visual impairment in children and young adults
• 20-25% blindness in working age population due to IRDs
• Prevalence higher in India than the western world
• Prevalence higher in rural and tribal populations compared to urban (possibly due
to more consanguinity)
4. • Why are IRDs challenging?
• Vast heterogeneity
• Difficult to characterize
• Challenging to diagnose correctly by a clinician who is not an IRD expert
• Families are often bewildered by the progressive vision loss and are
concerned about whether and when blindness will develop.
• Patients are always anxious about progression and understandably always
have the same question in all annual visits.
BASICS OF IRDs
6. • Medical history is vital (as always)
• Age of onset
• Symptom complex at onset
• Progressive or stationary?
• If available: previous ophthalmological records: especially BCVA, VF
• Whether the vision loss is:
• Peripheral/ night blindness – rod predominant disease
• Central/ photophobia/ hemeralopia – cone predominant disease
APPROACH TO IRDs
7. APPROACH TO IRDs
• Family history, especially history of consanguinity
• Try to develop an inheritance pattern using a 3-generation-pedigree
chart
• Systemic disorders in family: e.g. DM in mother/ hearing loss in sister
can point to mitochondrial inheritance
• Consanguinity – associated with AR disorders
• VERY IMPORTANT to ask for associated systemic features– associated
syndromic conditions
• Usher syndrome – hearing loss
• Bardet-Biedl syndrome – obesity, polydactyly, mental retardation, nyctalopia
8. • Important to rule out acquired conditions that can mimic IRDs
clinically
• Vitamin A deficiency
• Toxicity to drugs such as phenothiazines, hydroxychloroquine, pentosan
polysulfate
• Autoimmune or carcinoma related retinopathy
• Diffuse uveitis/ infections/ arterial occlusions
APPROACH TO IRDs
9. • Importance of a good history and review of previous records cannot
be overemphasized.
APPROACH TO IRDs
A case of
deferoxamine toxicity
in a patient with
Sickle Cell on
transfusion therapy
10. ELECTROPHYSIOLOGY
• Identify site of damage
• Pin-point the cell type involved in the degenerative process
• Non-invasive, important when fundus image doesn’t correspond with vision
• Include:
• Full-field ERG
• Multi-focal ERG
• Pattern ERG
11.
12.
13.
14. Basics of ERG
• In Pattern ERG P50/ positive peak – indicates macular function
• N95/ negative deflection – indicates ganglion cell function
• However, PERG is affected by refractive errors and media opacities
• Spatial localization of defects is better with mfERG
20. GENETIC TESTING
• Foundation of the age of miracles
• Landscape has changed drastically in the last decade
• BEFORE: difficult to access, prohibitively expensive, only test a few genes at
a time using standard techniques, results did not affect clinical care
• NOW: Accessible, from free to inexpensive, option of whole-gene-
sequencing, results have a HUGE bearing on treatment options
• Free if patients undergo testing by the Province. Very inexpensive and
much faster if using private providers.
21.
22.
23.
24.
25.
26. • Important to know important aspects of the Visual Cycle
• E.g. RPE65 gene converts all-trans-retinyl ester into 11-cis-retinol
• So RPE65 deficiency causes retinyl esters to accumulate causing recessive
blinding disorder – LCA
• Mechanisms of gene therapy
• Augmentation – Recessive disease
• Suppression – Dominant disease
• Addition – Subretinal delivery of growth factors
• Optogenetics – Neuromodulation
• Why RPE is a favorable target?
• RPE is a single cell layer
• So disorders where photoreceptors damage is secondary to genetic RPE problems
give better results with gene therapy
GENE THERAPY
27. • Viral vectors
• Ideally good transduction effects, low immunogenicity, no mutagenesis, cell specific tropism but
with ability to target both dividing and non-dividing cells, unlimited cloning capacity while having
low cytotoxicity
• Adeno, adeno-associated (AAVs), Retro, Lentiviruses
• AAVs most promising right now
• MAIN DISADVANTAGE – Low packaging capacity (e.g. ABCA4 for Stargadt is too large for AAV4)
• Non-Viral vectors
• Nanoparticles, Liposomes, naked DNA
• Many unresolved issues so not preferred
GENE DELIVERY SYSTEMS
28. VARIANTS OF GENE THERAPY
• Optogenetics
• “Conventional” gene therapy cannot overcome lack of photoreceptors which
is usually the case in advanced IRDs
• AAV vectors deliver Rhodopsin and Melanopsin to functional bipolar and
ganglion cells – activated by light – trigger nerve impulse
• Sounds incredible but opsins have very low efficiency in non native cells
• AON
• Antisense oligonucleotide (ASO) therapy
• Uses much smaller molecules so BIG ADVANTAGE: intravitreal route possible
• CRISPR/CAS-9 Therapy: gene editing
• Trying to overcome a major hurdle: Current therapies ARE USELESS IN
AUTOSOMAL DOMINANT DISORDERS
29.
30.
31. LUXTURNA
• Voretigene Neparvovec (VN)
• First USFDA gene therapy in 2017
• For Biallelic LCA (LCA type 2 – rarer, more severe)
• Supposed to be a one-time treatment
• Why? – Because RPE cells are non-dividing, so delivered genome remains
stable
34. CELL THERAPY
• Cell replacement therapy aims at replacing damaged host cells with transplanted
donor cells
• Mutation independent and can work even when the cells are completely lost
• Potential For RPE transplantation as a viable therapy came from studies noting
improvement in visual acuity following the transplantation of autologous RPE
• Again, why RPE is so attractive? - The RPE cells grow readily in laboratory
cultures and unlike other cell types within the retina, RPE cells do not require
synaptic connections for their functions
37. OUTLINE OF STUDY
• The optogenetic vector, AAV vector encoding the light-sensing channel
rhodopsin protein ChrimsonR fused to the red fluorescent protein
tdTomato, was administered by a single intravitreal injection into the
worse-seeing eye to target mainly foveal retinal ganglion cells.
• The fusion protein tdTomato was included to increase the expression of
ChrimsonR in the cell membrane.
• 58 y old male. LP vision. RP for 40 years
• 15 visits over 84 months
38.
39.
40. LOTS OF CHALLENGES
• Gene therapy requires viable PR cells and hence will not be effective in advanced
stages of IRDs with severe PR degeneration
• Gene therapy is gene specific and treatment for each gene has to go through all
the steps of drug development
• VERY expensive – 450,000 USD per injection at the US
• Limited cargo capacity
• Complications inherent to the method of delivery of the product
• Potential presence/ development of antibodies
• Cell therapy requires systemic immunosuppression for prolonged periods
41. IMPORTANT DATA TO BE COLLECTED
• 10 years ago – different landscape - patients counselled but not much
hope, plus expensive gene testing
• Now, important to counsel regarding inexpensive and timely nature of gene
testing
• Important to inform about ongoing trials
• Important to form/ add to a database and registry.
• Even general ophthalmologists and practitioners should be aware that IRDs
in 2023 are different than before and warrant testing and possible therapy.
42. FUTURE PROSPECTS/ CONCLUSION
• If the 20th century belonged to major surgical breakthroughs in anterior and
posterior segments, the 21st century belongs to breakthroughs in gene testing,
therapies and treatment of diseases previously considered untreatable.
• The landscape has changed vastly over the last decade
• Future will involve gene therapy at early stages to preserve function.
• Stem cells harvested from skin biopsies or blood will provide easier access
compared to embryonic stem cells
• Next era will be an era of personalized medicine: combination of gene editing
(e.g CRISPR) and stem cells. Maybe everyone gets a unique gene ID (like PHIN).
43. FOR OUR RESIDENTS
• Even within the niche of retina specialists, there is a growing demand
of IRD experts
• Very few IRD specialists globally, mostly in the US
• Exciting opportunities in the form of fellowships in IRD and a practice
that will become more and more rewarding as time goes on.
44. A famous quote (though overused) fits the
description of future opportunities in a
career dealing with IRDs very appropriately –
“I skate to where the puck is going to be, not
to where it has been”