GS Paper: GS3-17.Awareness in the fields of IT, Space, Computers, Robotics, Nano-technology, Bio-technology and issues relating to Intellectual Property Rights.

Why in the News?

In an alarming move, the Guillain-Barre Syndrome (GBS) cases rise to 110 in Pune.

What is Guillain-Barré Syndrome (GBS)?

• GBS is an autoimmune disorder where the immune system attacks peripheral nerves, causing muscle weakness and, in severe cases, paralysis.
• It is rare, affecting 1–2 per 100,000 people annually.
• It is more common in adults and males.
• It is often triggered by viral or bacterial infections, especially Campylobacter jejuni (a cause of gastroenteritis), influenza, Epstein-Barr virus, Zika virus, or, in rare cases, vaccinations.
• Its Symptoms: 
  • Early signs: Tingling, weakness in legs spreading to the upper body, pins-and-needles sensation, back pain.
  • Severe cases: Paralysis, breathing difficulties, loss of speech, vision problems.
  • Complications: Can affect the autonomic nervous system, leading to irregular heartbeat, blood pressure fluctuations, and potential respiratory failure.

Treatment and Recovery:

• No definitive cure, but treatments include:
  • Plasma Exchange (Plasmapheresis): Removes harmful antibodies attacking nerves.
  • Intravenous Immunoglobulin (IVIG) Therapy: Injects healthy antibodies to counteract immune attacks.
• Supportive care: Some patients require ventilator support, physical therapy, and months to years of rehabilitation.

Why in the News?

Researchers have created a gene-editing tool to fix ABCA4 gene mutations, offering hope for treating Stargardt disease, a rare condition that causes progressive vision loss.

What is Stargardt Disease?

• Stargardt Disease is a rare inherited eye disorder that causes progressive vision loss, primarily affecting the central part of the retina, called the macula.
• It is typically caused by mutations in the ABCA4 gene, which disrupts the body’s ability to use Vitamin A, leading to an excessive buildup of lipofuscin (yellowish-brown pigment) in retinal cells.
• The disease commonly begins in childhood or early adulthood and is usually bilateral, involving both eyes.
• Currently, there is no cure for Stargardt Disease.

Symptoms of Stargardt Disease

• Progressive vision loss, particularly affecting central vision.
• Difficulty seeing in low light (night blindness).
• Blurred or distorted vision, with colors appearing less vivid.
• Appearance of dark spots or areas of vision loss in the central visual field.
• Gradual deterioration of visual acuity, leading to potential legal blindness.

Present Scenario in India

• According to a 2023 study by L.V. Prasad Eye Institute, Hyderabad:
  • The disease predominantly affects males and typically manifests during the second decade of life.
  • Estimated prevalence: 1 in 8,000 to 10,000 individuals.
  • 10.79% of patients had a family history of Stargardt disease, while 10.69% were from consanguineous marriages.
• In India, Stargardt disease is a not uncommon hereditary condition, with limited treatment options available.

Why in the News?

Researchers at Columbia University found that cells can selectively switch off one parent’s copy of a gene. This may explain why some people with harmful mutations remain symptom-free, and it could lead to new diagnostic and therapeutic approaches for genetic disorders.

About the Selective Silencing Mechanism:

• Selective gene silencing refers to the process where cells inactivate one parent’s copy of a gene (either maternal or paternal), resulting in an unequal contribution of the two gene copies to cellular function.
• Previously thought to be rare, recent research reveals that this phenomenon is relatively common and plays a significant role in genetic variability, disease progression, and individual health outcomes.
• Key Features:
  • Inactivation can vary between different cell types (e.g., immune cells and kidney cells).
  • The process is dynamic and may change over time, adding complexity to how genes function in the body.
  • Approximately 1 in 20 active genes in some immune cells exhibit this selective bias.
• Implications for Health:
  • This mechanism helps explain why individuals carrying the same disease-causing mutation can have vastly different symptom severities.
  • It shifts the understanding of genetic diseases, emphasizing the importance of dynamic gene activity patterns alongside static genetic codes.
  • The discovery opens up opportunities for novel diagnostic and therapeutic approaches by focusing on gene expression rather than genetic sequences.

What are its significant applications?

• Selective Gene Manipulation: Therapies could be developed to activate healthy gene copies while suppressing diseased ones, offering a less invasive alternative to traditional genetic editing.
• Improved Understanding of Diseases: Selective gene silencing explains variability in conditions like lupus and cancer, revealing why some individuals remain symptom-free.
• Precision Medicine: By identifying individual patterns of gene expression, personalized treatment options become possible, reducing the need for one-size-fits-all approaches.
• Early Interventions: Recognizing at-risk but asymptomatic individuals allows healthcare providers to implement preventive measures and potentially delay disease onset.
• Protein-Based Therapies: Focusing on selective gene activity aids in detecting and differentiating disease-related proteins from healthy ones, paving the way for targeted, protein-specific drugs.

Why in the News?

Researchers at the University of California, have developed a nanopore-based diagnostic tool capable of detecting illnesses more quickly and accurately by analyzing signals from individual molecules.

What is the Nanopore-Based Tool?

• The Nanopore-Based Tool is a groundbreaking innovation developed by UC Riverside scientists for disease diagnostics.
• It leverages nanopores, which are tiny openings capable of detecting individual molecules like DNA and proteins.
• By measuring electrical signals generated as molecules pass through the nanopore, the tool enables ultra-sensitive and precise detection of illnesses.

How does it Work?

• Biological samples mixed with salts are introduced into the system.
• Salts dissociate into ions, creating a flow through the nanopore.
• As a DNA or protein molecule passes through the nanopore, it blocks the flow of ions.
• This blockage reduces the flow, creating electrical signals.
• The system measures the reduction in ion flow to identify the molecule.
• Advanced circuitry accounts for missed signals, ensuring precise detection.
• Nanopores filter out background noise, unlike traditional systems that require external filters, preserving critical data for accurate diagnostics.

Significance and Features of Nanopore Technology

• It helps detect infections within 24 to 48 hours, much faster than traditional methods.
• It is crucial for fast-spreading diseases, enabling timely intervention.
• It captures signals from single molecules, eliminating the need for large biological samples.
• It could revolutionize home testing and clinic-based diagnostics.
• It helps Identify subtle differences in proteins, aiding in personalized treatment plans.
• It promotes deeper understanding of how proteins impact health and disease.
• It paves the way for single-molecule protein sequencing, offering insights beyond DNA sequencing.