This document provides an overview of molecular pathology and various molecular techniques. It discusses the use of nucleic acid testing for clinical purposes such as diagnosis, prognosis, and pharmacogenetics/pharmacogenomics. It describes several molecular techniques including DNA sequencing, PCR, real-time PCR, FISH, microarrays, and their applications. It also discusses DNA/RNA structure, gene expression, mutations, molecular pathology specimen handling, and instrumentation.
Immunohistochemistry (IHC) is a highly sensitive method that allows the localization of antigen within a cell or a tissue with high resolution. The method is based on the use of a primary antibody that specifically binds to its complementary antigen. The bound antibody may then be visualized by a variety of methods such as colorimetric end points.
Molecular diagnostics is a collection of techniques used to analyse biological markers in the genome and proteome—the individual's genetic code and how their cells express their genes as proteins—by applying molecular biology to medical testing.
It contains information about- DNA Sequencing; History and Era sequencing; Next Generation Sequencing- Introduction, Workflow, Illumina/Solexa sequencing, Roche/454 sequencing, Ion Torrent sequencing, ABI-SOLiD sequencing; Comparison between NGS & Sangers and NGS Platforms; Advantages and Applications of NGS; Future Applications of NGS.
Deciphering DNA sequences is essential for virtually all branches of biological research. With the
advent of capillary electrophoresis (CE)-based Sanger sequencing, scientists gained the ability to
elucidate genetic information from any given biological system. This technology has become widely
adopted in laboratories around the world, yet has always been hampered by inherent limitations in
throughput, scalability, speed, and resolution that often preclude scientists from obtaining the essential
information they need for their course of study. To overcome these barriers, an entirely new technology
was required—Next-Generation Sequencing (NGS), a fundamentally different approach to sequencing
that triggered numerous ground-breaking discoveries and ignited a revolution in genomic science.
Immunohistochemistry (IHC) is a highly sensitive method that allows the localization of antigen within a cell or a tissue with high resolution. The method is based on the use of a primary antibody that specifically binds to its complementary antigen. The bound antibody may then be visualized by a variety of methods such as colorimetric end points.
Molecular diagnostics is a collection of techniques used to analyse biological markers in the genome and proteome—the individual's genetic code and how their cells express their genes as proteins—by applying molecular biology to medical testing.
It contains information about- DNA Sequencing; History and Era sequencing; Next Generation Sequencing- Introduction, Workflow, Illumina/Solexa sequencing, Roche/454 sequencing, Ion Torrent sequencing, ABI-SOLiD sequencing; Comparison between NGS & Sangers and NGS Platforms; Advantages and Applications of NGS; Future Applications of NGS.
Deciphering DNA sequences is essential for virtually all branches of biological research. With the
advent of capillary electrophoresis (CE)-based Sanger sequencing, scientists gained the ability to
elucidate genetic information from any given biological system. This technology has become widely
adopted in laboratories around the world, yet has always been hampered by inherent limitations in
throughput, scalability, speed, and resolution that often preclude scientists from obtaining the essential
information they need for their course of study. To overcome these barriers, an entirely new technology
was required—Next-Generation Sequencing (NGS), a fundamentally different approach to sequencing
that triggered numerous ground-breaking discoveries and ignited a revolution in genomic science.
An oncogene is a gene that has the potential to cause cancer. In tumor cells, they are mutated or expressed at high levels. Most normal cells undergo a programmed form of rapid cell death (apoptosis) when critical functions are altered.
Presentation on nested pcr . contain types of pcr, protocol of nested pcr, advantages of nested pcr, disadvantages of nested pcr, application of nested pcr ,pictorial representation of pcr.
Principle of DNA Microarray Technique
The principle of DNA microarrays lies on the hybridization between the nucleic acid strands.
The property of complementary nucleic acid sequences is to specifically pair with each other by forming hydrogen bonds between complementary nucleotide base pairs.
cytology of urine tract - this slide contains the specimen collection method, preparation of specimen, types of fixatives, other preparation techniques, urinary tract histology, normal urinary tract cytology,
Immunofluorescence : Immunofluorescence is a powerful technique that utilizes fluorescent-labeled antibodies to detect specific target antigens..
Fluorescein is a dye which emits greenish fluorescence under UV light. It can be tagged to immunoglobulin molecules.
This technique is sometimes used to make viral plaques more readily visible to the human eye.
Immunofluorescent labeled tissue sections are studied using a fluorescence microscope.
An oncogene is a gene that has the potential to cause cancer. In tumor cells, they are mutated or expressed at high levels. Most normal cells undergo a programmed form of rapid cell death (apoptosis) when critical functions are altered.
Presentation on nested pcr . contain types of pcr, protocol of nested pcr, advantages of nested pcr, disadvantages of nested pcr, application of nested pcr ,pictorial representation of pcr.
Principle of DNA Microarray Technique
The principle of DNA microarrays lies on the hybridization between the nucleic acid strands.
The property of complementary nucleic acid sequences is to specifically pair with each other by forming hydrogen bonds between complementary nucleotide base pairs.
cytology of urine tract - this slide contains the specimen collection method, preparation of specimen, types of fixatives, other preparation techniques, urinary tract histology, normal urinary tract cytology,
Immunofluorescence : Immunofluorescence is a powerful technique that utilizes fluorescent-labeled antibodies to detect specific target antigens..
Fluorescein is a dye which emits greenish fluorescence under UV light. It can be tagged to immunoglobulin molecules.
This technique is sometimes used to make viral plaques more readily visible to the human eye.
Immunofluorescent labeled tissue sections are studied using a fluorescence microscope.
Presentation format4 posttranslational modification in cell adhesion and migr...Birgit Kastberger
Posttranslational modifications (PTMs) of proteins are influencing cell adhesion and migration. This is an overview of the most common PTMs like phosporylation, acetylation and methylation and their impact on cell signalling.
Primera presentación realizada por el equipo de TeamStudy en la asignatura ISPP de la universidad de Sevilla, podréis ver la presentación en nuestro canal de YouTuBe:
https://www.youtube.com/watch?v=c4CEreOaKmg&feature=youtu.be
An honest effort to present molecular marker in easiest way both informative and conceptual. Hybridization based (non-PCR) and PCR based markers are discussed to the point with suitable diagram.
DNA Fingerprinting & its techniques by Shiv Kalia (M.Pharma in Analytical Che...Shiv Kalia
DNA fingerprinting and below mention content widely cover in this presentation
History & Introduction of DNA fingerprinting
How was the first DNA fingerprint produced?
Types of DNA Based Markers
Polymerase Chain Reaction (PCR)
PCR based Methodology of DNA fingerprinting
Electrophoresis
Utility of DNA Based Markers
Various DNA Fingerprinting Techniques Advantages & Disadvantages
Authentication of Various Ayurvedic Herbs by DNA Fingerprinting
Advantages of DNA fingerprinting in Plants
Disadvantages of DNA fingerprinting in Plants
CONCLUSION
Origin of life in universe is most debating and interesting topic for all scientist .which divided in 3 parts chemosynthesis theory ,RNA world hypothesis and some evidence about extraterrestrial life.
India is not that country of religions its country of unity ,love and purity where peoples live with big heart . but still India is different than world . just watch it and it will be use full for Indians to know where we are
Epidermodysplasia verruciformis which is from papiloma virus and cause Very Dangerous diseases which called as Tree Man Illness in this description some molecular markers are use to detection of this virus
Topic from Molecular ecology in which its possible to sexual selection According to color Polymorphism In small animals Like fish,butterfly,birds In laboratory scale by applying Molecular makrers
there are s many methods are used in diagnosis of human gene mutation which occur disorders ,here u get information about the diagnostic method for genetic mutation detection
Understanding of Models use for biomedical research who have similar physiological function like humans ,and the how to generate and which models are useful
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
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These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
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The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
2. Molecular Pathology
Testing of nucleic acids within a clinical context
Helpful
Hereditary disorders
Oncology
Infectious diseases
•Specific purposes
•Diagnosis
•Prognosis
•Prenatal testing
•Pharmacotherapy
•Pharmacogenetics
•Pharmacogenomics
Molecular pathology employs an ever-expanding array of special techniques to study
nucleic acids, genes, gene products, receptors, signaling pathways, the cell cycle, and
mutations.
3.
4. Watson and Crick
The structure of DNA was described by British
Scientists Watson and Crick as long double helix
shaped with its sugar phosphate backbone on the
outside and its bases on inside; the two strand of
helix run in opposite direction and are anti-
parallel to each other. The DNA double helix is
stabilized by hydrogen bonds between the bases
Doctortvrao’s ‘e’ learning series
5. DNA
A molecule contains two polynucleotide strands that
form an an antiparallel double helix.
Nucleotides:
Nitrogenous base (AT GC,U)
Deoxyribose
Phosphate
6. DNA makes a Copy of Self
Replication is the process
where DNA makes a copy
of itself. Why does DNA
need to copy? Simple: Cells
divide for an organism to
grow or reproduce, every
new cell needs a copy of
the DNA or instructions to
know how to be a cell.
DNA replicates right
before a cell divides.
7. DNA – RNA – DNA
a never ending cycle
RNA has the job of taking
the message from the DNA
to the nucleus to the
ribosome's.
Transcription - RNA is
made from DNA
Translation - Proteins are
made from the message on
the RNA
Doctortvrao’s ‘e’ learning series
8. RNA = Ribonucleic acid.
RNA is similar to
DNA except:
It has one strand
instead of two
strands. Has uracil
instead of thymine
3.Has Ribose instead of
Deoxyribose
9. Gene Expression
DNA level expression control
Transcriptional
Post-Transcriptional
Epigenetics
DNA methylation
Histone modification
10. Gene Expression
DNA level expression control
Transcriptional
House keeping genes
Always on
Transcription factors
Usually lie upstream in the promoter region
Enhancer and silencer elements
11. Gene Expression
Post transcriptional
Export of mRNA out of nucleus
Alternative splicing
mRNA stabilization
mRNA degradation
RNA interference or silencing
miRNA and siRNA
12. What is Gene
The gene, the basic
units of inheritance;
it is a segment within
a very long strand of
DNA with specific
instruction for the
production of one
specific protein.
Genes located on
chromosome on it's
place or locus.
13. Mutations and Polymorphisms
Mutation: change in DNA sequence
Polymorphism: non disease causing change in DNA or
a change found at a frequency of ≥ 1% in population
When evaluating changes in DNA sequence use
neutral terms: sequence variant, sequence alteration or
allelic variant. There may be:
Missense, nonsense, deletions, insertions, frame shifts,
duplications, amplifications, trinucleatide repeats.
14. Single Nucleotide Polymorhisms
and Haplotypes
SNPs are single base differences in the DNA of
individuals
There are ~10 million SNPs in the human genome
IMPORTANCE: Pharmacogenetics
Ex. CYP (cP450)
Alleles of SNPs that are close together tend to be
inherited together.
Haplotype: a set of associated SNPs alleles in a region
of a chromosome
15. Overview of Molecular Techniques
and Instrumentation
Standard or usual specimen flow
Specimen collection (blood, tissue)
Nucelic acid isolation (DNA or RNA)
Nucleic acid quantification (optional)
Nucleic acid storage
Nucleic acid amplification (or other)
Test interpretation
Quality control
16. Nucleic acid isolation (DNA or RNA)
Manual vs. automated
Cell lysis
Dependent of specimen type, nucleic acid being isolated for,
desired purity and application to be used in
FFPE yields ~200 pairs
Purification
Organic: phenol-chloroform
Non organic: silica, anion exchange chromatography and
magnetic particles
DNA or RNA Isolation
RNA rapidly degrades…
17. Methods
DNA sequencing
Southern Blot
PCR
RT-PCR
Real Time PCR
Methylation-Specific PCR
In-situ PCR
Protein Truncation Test
Transcription-Mediated
Amplification
Strand Displacement
Amplification
Nucleic Acid Sequence-
Based Amplification
Signal amplification
Branching DNA
Hybrid Capture
Invader
FISH
DNA arrays and chips
18. Gene sequencing
Determining the exact sequence of the four bases in a
given DNA template
Two methods
Maxam-Gilbert
Chemical degradation
Sanger
Chain termination
Radiolabeled, Dye-prime or Dye-terminator (cycle
sequencing)
Pyrosequencing
Sequnces a short length of DNA (~30-60 bases)
19. Applications
of Direct DNA sequences
Clinical condition Gene
HIV drug resistance HIV-protease, RT
Cystic fibrosis CFTR gene
Beta thalassemia Beta globin
Cancer predisposition
• breast BRCA1
•Hereditary non polyposis colon
cancer
TP53
•MEN PTEN Ret proto-oncogene
Congenital hearing loss Connexin 26
HCV genotyping 5’UTR
20. Array-based Comparative Genomic
Hybridization
Comparative Genomic Hybridization is done in
metaphases in classical cytogenetics (M-CGH)
Resolution 5 Mb
Bacterial Artificial Chromosome (BAC) maps the
human genome therefore an Array based-CGH can be
created (A-CGH). Different resolutions up to 32,000
(45 kb)
cDNA-CGH
Oligonucleotide-CGH
Can detect Single Nucleotide Pleomorphisms (SNPs)
[Gene Chip]
21.
22. Methods
DNA sequencing
Southern Blot
PCR
RT-PCR
Real Time PCR
Methylation-Specific PCR
In-situ PCR
Protein Truncation Test
Transcription-Mediated
Amplification
Strand Displacement
Amplification
Nucleic Acid Sequence-
Based Amplification
Signal amplification
Branching DNA
Hybrid Capture
Invader
FISH
DNA arrays and chips
23. Southern Blot
Edwin M Southern, 1974
DNA extracted
DNA cut into pieces (Restriction Endonucleases)
Electrophoresis and size separated
Blot (transferred) to a membrane
Anealed with labeled (radioactive, fluorescence,
chemiluminescent) probe
25. Uses of Southern Blotting
Southern blots are used in gene discovery and mapping,
evolution and development studies, diagnostics and
forensics.
In regards to genetically modified organisms, Southern
blotting is used as a definitive test to ensure that a
particular section of DNA of known genetic sequence has
been successfully incorporated into the genome of the host
organism.
Used in prognosis of cancer and in prenatal diagnosis of
genetic diseases
26. Methods
DNA sequencing
Southern Blot
PCR
RT-PCR
Real Time PCR
Methylation-Specific PCR
In-situ PCR
Protein Truncation Test
Transcription-Mediated
Amplification
Strand Displacement
Amplification
Nucleic Acid Sequence-
Based Amplification
Signal amplification
Branching DNA
Hybrid Capture
Invader
FISH
DNA arrays and chips
27. PCR
Kary B. Mullis 1983
Target amplification
Single oligonucletide
Multiplexed
Mimics the natural process of DNA replication, therefore,
requires:
DNA template, DNA polymerase, dNTPs, buffer, Mg++, two
primers to flag the target sequence
Thermal cycler
Denaturation ~95°C
Annealing ~45-60°C
Extension ~72°C
28. PCR
Denaturation
Breaks the hydrogen bonds between the ds-DNA
Anealing
Binding to oligonucleotide sequence (probe)
Extension
DNA polymerase (heat stable, Taq [Thermophilus
aquaticus]) replicates the selected DNA sequence
Xn = X0 × (1 + E)n E= 0 - 1
29. RT-PCR
To detect or quantify RNA transcripts or viral RNA
RNA is converted to DNA
Reverse transcriptase (Avian Myeloblastosis Virus and
Moloney Murine Leukemia virus)
Isothermal reaction with primers: oligo dT, random
hexamer primers, or target specific primers
One step vs. two steps
30.
31.
32. PCR or RT-PCR
Product analysis / detection
Real Time
Hybridization
Membrane bound
Reverse line blots
Liquid Bead Array with Flow Cytometry
Electrophoresis
Agarose
Capillary
Cycle sequencer
38. Real Time - PCR
Amplifies and detects PCR product fluorescently in
each well of PCR plate
Don’t have to run gel afterwards
Use for endpoint detection
Examples
Fast PCR screening without gels
Locate clone or mutant of interest
Genotyping SNPs
Genotype individuals using allele specific primers
39.
40. PCR
Advantages Disadvantages
Sensitivity
Specificity
Speed
Versatility
Automated
No need for intact DNA/RNA
Target sequence needs to be
known
Target needs to be conserved
among individuals
(polymorphisms)
Oligonucleotide length
Can fail in the detection of
chromosomal abnormalities like
translocations, inversions, large
addition or deletions
Contamination (F+)
41. Methods
DNA sequencing
Southern Blot
PCR
RT-PCR
Real Time PCR
Methylation-Specific PCR
In-situ PCR
Protein Truncation Test
Transcription-Mediated
Amplification
Strand Displacement
Amplification
Nucleic Acid Sequence-
Based Amplification
Signal amplification
Branching DNA
Hybrid Capture
Invader
FISH
DNA arrays and chips
42. Branched DNA applications
Detection HIV, HBV,
and HCV
Measures viral loads
Less sensitive than
PCR
Doctortvrao’s ‘e’ learning series
43. Hybrid Capture
Qiagen
Signal amplification technique
Denaturated DNA gets hybridized to complimentary
unlabeled RNA sequences (if DNA sequence is present)
Antibody bound to the well is attracted to RNA:DNA
hybrids
A second conjugated anti RNA:DNA hybrid antibody is
added
Chemiluminescent signal is generated in proportion of
target DNA present
44.
45.
46. Applications in Anatomic Pathology
1. Anatomic Pathology Testing to Detect or Characterize
Neoplasia.
2. Molecular Anatomic Testing for Targeted Therapies.
3. Anatomic Pathology Testing for Infectious Agents.
47. 1. P.T. Cagle, T.C. Alan (Eds.), Basic Concepts of Molecular Pathology. Molecular
Pathology Library, vol. 2, Springer Science and Business Media, 2009.
Editor's Notes
ONE STEP: RT + DNA polymerase OR rTth (Thermus themophilus) that works as an RT and DNA polymerase
Hybridization probe: Two separate, single-labeled probes anneal to target bringing donor and reporter into proximity
Dual-labeled hydrolysis probe: When the reporter and quencher fluorophores are in proximity on the probe – there is no signal. Once the 5’nuclease activity of the DNA polymerase hydrolyses the end nucleotides from the probe where the reporter is. The reporter emits a signal.
Minor groove binding probes (MGB): like hydrolysis probes, technique to stabilize shorter probes.
Molecular beacon probes: Annealing to the target after denaturation allows the reporter fluorophore to escape the quenching effect, therefore giving a signal