Retinal Diseases

Source: TH

Context: Retinal diseases, particularly Inherited Retinal Diseases (IRDs), are gaining attention due to advancements in RNA-based therapeutics that offer hope for treating genetic causes of blindness.

About Retinal Diseases:

• What are Retinal Diseases? Retinal diseases are disorders that affect the retina, the light-sensitive tissue at the back of the eye. These diseases can lead to progressive vision lossand, in severe cases, blindness. They can be caused by genetic mutations, aging, or other underlying health conditions. • Retinal diseases are disorders that affect the retina, the light-sensitive tissue at the back of the eye. • These diseases can lead to progressive vision lossand, in severe cases, blindness. They can be caused by genetic mutations, aging, or other underlying health conditions. • Role of the Retina in Vision: • The retina is responsible for converting light into neural signals, which are sent to the brain via the optic nerve. It contains specialized cells called photoreceptors (rods and cones) that detect light and colour, enabling us to see. Damage to the retina disrupts this process, leading to vision impairment or blindness. • The retina is responsible for converting light into neural signals, which are sent to the brain via the optic nerve. • It contains specialized cells called photoreceptors (rods and cones) that detect light and colour, enabling us to see. • Damage to the retina disrupts this process, leading to vision impairment or blindness. • Types of Retinal Diseases: • Inherited Retinal Diseases (IRDs): Caused by genetic mutations in over 300 genes. • Inherited Retinal Diseases (IRDs): Caused by genetic mutations in over 300 genes. Examples: Retinitis Pigmentosa, Leber Congenital Amaurosis, Stargardt Disease.

• Age-Related Macular Degeneration (AMD): Affects the central part of the retina (macula), leading to loss of central vision. Diabetic Retinopathy: Caused by damage to blood vessels in the retina due to diabetes. Retinal Detachment: Occurs when the retina pulls away from its normal position. Retinoblastoma: A rare cancer of the retina, primarily affecting children. • Age-Related Macular Degeneration (AMD): Affects the central part of the retina (macula), leading to loss of central vision. • Diabetic Retinopathy: Caused by damage to blood vessels in the retina due to diabetes. • Retinal Detachment: Occurs when the retina pulls away from its normal position. • Retinoblastoma: A rare cancer of the retina, primarily affecting children. RNA-based therapeutics can cure retinal diseases:

• What is RNA Therapy? RNA-based therapies involve using ribonucleic acid (RNA**)to correct genetic defects or modulate gene expression. Unlike DNA-based therapies, RNA therapies are temporary and do not alter the patient’s genome, reducing the risk of long-term side effects. • RNA-based therapies involve using ribonucleic acid (RNA)**to correct genetic defects or modulate gene expression. Unlike DNA-based therapies, RNA therapies are temporary and do not alter the patient’s genome, reducing the risk of long-term side effects. • Types of RNA Therapies for Retinal Diseases: • Antisense Oligonucleotides (ASOs): Small RNA molecules that bind to specific RNA sequences to correct genetic errors. Used to treat conditions like spinal muscular atrophy and being explored for Stargardt Disease and Retinitis Pigmentosa. RNA Editing with ADAR Enzymes: Corrects specific mutations at the RNA level without altering DNA. Promising for treating IRDs caused by single-point mutations. Suppressor tRNAs: Bypass stop-codon mutations that prematurely halt protein synthesis, restoring full-length protein production in retinal cells. Small Molecule RNA Therapies (e.g., PTC124/Ataluren): Used to treat cystic fibrosis and Duchenne muscular dystrophy, now being tested for rare eye diseases like aniridia. • Antisense Oligonucleotides (ASOs): Small RNA molecules that bind to specific RNA sequences to correct genetic errors. Used to treat conditions like spinal muscular atrophy and being explored for Stargardt Disease and Retinitis Pigmentosa. • Small RNA molecules that bind to specific RNA sequences to correct genetic errors. • Used to treat conditions like spinal muscular atrophy and being explored for Stargardt Disease and Retinitis Pigmentosa. • RNA Editing with ADAR Enzymes: Corrects specific mutations at the RNA level without altering DNA. Promising for treating IRDs caused by single-point mutations. • Corrects specific mutations at the RNA level without altering DNA. • Promising for treating IRDs caused by single-point mutations. • Suppressor tRNAs: Bypass stop-codon mutations that prematurely halt protein synthesis, restoring full-length protein production in retinal cells. • Bypass stop-codon mutations that prematurely halt protein synthesis, restoring full-length protein production in retinal cells. • Small Molecule RNA Therapies (e.g., PTC124/Ataluren): Used to treat cystic fibrosis and Duchenne muscular dystrophy, now being tested for rare eye diseases like aniridia. • Used to treat cystic fibrosis and Duchenne muscular dystrophy, now being tested for rare eye diseases like aniridia. • Advantages of RNA Therapies: • Precision: Targets specific genetic mutations. Safety: Temporary changes reduce the risk of unintended effects. Versatility: Can address a wide range of genetic defects. • Precision: Targets specific genetic mutations. • Safety: Temporary changes reduce the risk of unintended effects. • Versatility: Can address a wide range of genetic defects. Insta links:

• Ribonucleic-acid-RNA