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 Definiton: an experimental technique for
correcting defective genes that are
responsible for disease development
 The most common form of gene therapy
involves inserting a normal gene to replace an
abnormal gene
 Other approaches used:
 Replacing a mutated gene that causes
disease with a healthy copy of the gene.
 Inactivating, or “knocking out,” a mutated
gene that is functioning improperly.
 Introducing a new gene into the body to
 Result in permanent changes.
 Potential for offering a permanent therapeutic effect
for all who inherit the target gene.
 Possibility of eliminating some diseases from a
particular family.
 Also raises controversy:
 Some people view this type of therapy as
unnatural, and liken it to "playing God”.
 Others have concerns about the technical
aspects.
 Affects only the targeted cells in the patient, and
is not passed to future generations.
 Short-lived because the cells of most tissues
ultimately die and are replaced by new cells.
 Transporting the gene to the target cells or
tissue is also problematic.
 Appropriate and acceptable for many disorders,
including cystic fibrosis, muscular dystrophy,
cancer, and certain infectious diseases.
Ex
vivo
• cells are modified
outside the body and
then transplanted back
in again
• called ex vivo because
the cells are treated
outside the body
In
vivo
• genes are changed in
cells when the cells are
still in the body
• called in vivo because
the gene is transferred
to cells inside the
patient’s body
The two major classes of methods :
recombinant viruses – VIRAL VECTOR
naked DNA or DNA complexes – NONVIRAL VECTOR
 Virus bind to their hosts and introduce their genetic
material into the host cell.
 Plausible strategy for gene therapy, by removing the
viral DNA and using the virus as a vehicle to deliver the
therapeutic DNA.
 The viruses used are altered to make them safe,
although some risks still exist with gene therapy.
 adeno-associated viruses, lentiviruses, pox viruses,
alphaviruses, and herpes viruses.
 Delivery of genes by a virus is termed transduction and
the infected cells are described as transduced.
physical
• Physical approaches, including
• Needle injection
• Electroporation
• Gene gun
• Ultrasound
• Hydrodynamic delivery
• employ a physical force that permeates the
cell membrane and facilitates intracellular
gene transfer
Chemical
THAT ENHANCE THE
DELIVERY OF GENE
THERAPY
-lipoplexes & polyplexes-
LIPOPLEXES • 3 types of lipids:
• anionic (negatively
charged)
• neutral
• cationic (positively
charged)
• In gene transfer into
cancer cells, where
the supplied genes
have activated tumor
suppressor control
genes in the cell
• decrease the activity
of oncogenes.
POLYPLEXES
• Complexes of
polymers
with DNA are called
polyplexes
• consist of cationic
polymers and their
production is
regulated by ionic
interactions.
• large difference
compared to
lipoplexes is that
polyp lexes cannot
release their DNA
load into
the cytoplasm,
 Researchers are studying gene therapy for a
number of diseases, such as
 Severe combined immuno-deficiencies
(SCID)
 Haemophilia
 Parkinson's disease
 Cancer
 HIV
Retinal disease
Color blindness
Adrenoleukodystrophy
 Give a chance of a normal life to baby
born with genetic disease.
 Give hope of healthy life to cancer
patient.
 For certain disease that do not have any
cure except gene therapy, it could save
many lives
ADVANTAGES OF GENE
THERAPY
 The genetic testing, screening and research in finding
the availability of certain gene is very controversy.
 May increase rate of abortion if prenatal test
regarding baby with genetic disease is done.
 The cost is very high.
 Cosmetic industry may monopolized this gene
therapy if it is used in enhancing beauty and in
vanishing the aging effect, rather than used for
treatment of a disease.
Gene therapy

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Gene therapy

  • 1.
  • 2.  Definiton: an experimental technique for correcting defective genes that are responsible for disease development  The most common form of gene therapy involves inserting a normal gene to replace an abnormal gene  Other approaches used:  Replacing a mutated gene that causes disease with a healthy copy of the gene.  Inactivating, or “knocking out,” a mutated gene that is functioning improperly.  Introducing a new gene into the body to
  • 3.
  • 4.  Result in permanent changes.  Potential for offering a permanent therapeutic effect for all who inherit the target gene.  Possibility of eliminating some diseases from a particular family.  Also raises controversy:  Some people view this type of therapy as unnatural, and liken it to "playing God”.  Others have concerns about the technical aspects.
  • 5.  Affects only the targeted cells in the patient, and is not passed to future generations.  Short-lived because the cells of most tissues ultimately die and are replaced by new cells.  Transporting the gene to the target cells or tissue is also problematic.  Appropriate and acceptable for many disorders, including cystic fibrosis, muscular dystrophy, cancer, and certain infectious diseases.
  • 6. Ex vivo • cells are modified outside the body and then transplanted back in again • called ex vivo because the cells are treated outside the body In vivo • genes are changed in cells when the cells are still in the body • called in vivo because the gene is transferred to cells inside the patient’s body
  • 7.
  • 8.
  • 9. The two major classes of methods : recombinant viruses – VIRAL VECTOR naked DNA or DNA complexes – NONVIRAL VECTOR
  • 10.  Virus bind to their hosts and introduce their genetic material into the host cell.  Plausible strategy for gene therapy, by removing the viral DNA and using the virus as a vehicle to deliver the therapeutic DNA.  The viruses used are altered to make them safe, although some risks still exist with gene therapy.  adeno-associated viruses, lentiviruses, pox viruses, alphaviruses, and herpes viruses.  Delivery of genes by a virus is termed transduction and the infected cells are described as transduced.
  • 11.
  • 12.
  • 13. physical • Physical approaches, including • Needle injection • Electroporation • Gene gun • Ultrasound • Hydrodynamic delivery • employ a physical force that permeates the cell membrane and facilitates intracellular gene transfer Chemical THAT ENHANCE THE DELIVERY OF GENE THERAPY -lipoplexes & polyplexes-
  • 14. LIPOPLEXES • 3 types of lipids: • anionic (negatively charged) • neutral • cationic (positively charged) • In gene transfer into cancer cells, where the supplied genes have activated tumor suppressor control genes in the cell • decrease the activity of oncogenes. POLYPLEXES • Complexes of polymers with DNA are called polyplexes • consist of cationic polymers and their production is regulated by ionic interactions. • large difference compared to lipoplexes is that polyp lexes cannot release their DNA load into the cytoplasm,
  • 15.  Researchers are studying gene therapy for a number of diseases, such as  Severe combined immuno-deficiencies (SCID)  Haemophilia  Parkinson's disease  Cancer  HIV
  • 17.  Give a chance of a normal life to baby born with genetic disease.  Give hope of healthy life to cancer patient.  For certain disease that do not have any cure except gene therapy, it could save many lives ADVANTAGES OF GENE THERAPY
  • 18.  The genetic testing, screening and research in finding the availability of certain gene is very controversy.  May increase rate of abortion if prenatal test regarding baby with genetic disease is done.  The cost is very high.  Cosmetic industry may monopolized this gene therapy if it is used in enhancing beauty and in vanishing the aging effect, rather than used for treatment of a disease.