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UPSC MainsGeneral Studies Paper IScience and TechnologyPractice question

Biotechnology in Disease Diagnosis and Treatment

What are the uses of biotechnology in disease diagnosis? How can biotechnology be used for curing life-threatening diseases?

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Introduce biotechnology in modern healthcare, shifting from symptom management to precision interventions. Detail specific applications in disease diagnosis using molecular biology and genomic sequencing. Elaborate on therapeutic interventions for life-threatening illnesses such as gene editing, cell therapies, and recombinant therapeutics, concluding with the need for accessibility and indigenous manufacturing.

Model answer

373 words

Introduction

Biotechnology leverages biological systems, cellular processes, and recombinant genetics to develop cutting-edge healthcare technologies. Recent breakthroughs have shifted modern clinical practice from merely managing pathological symptoms to providing molecular-level diagnostics and definitive, targeted cures for critical illnesses.

Uses of Biotechnology in Disease Diagnosis

Biotechnological techniques enable early, highly specific, and rapid detection of infectious agents and genetic abnormalities before clinical manifestations occur.

  • Molecular Diagnostics: Assays such as Reverse Transcription-Polymerase Chain Reaction (RT-PCR) and Enzyme-Linked Immunosorbent Assay (ELISA) enable the amplification and detection of viral and bacterial genetic material (e.g., SARS-CoV-2, HIV) with ultra-high sensitivity.
  • CRISPR-Based Diagnostics: Diagnostic tools leveraging Cas endonucleases (such as India's FELUDA test based on Cas9) offer rapid, low-cost, and point-of-care paper-strip detection of specific viral sequences and pathogenic mutations.
  • Next-Generation Genomic Sequencing (NGS): High-throughput whole-genome and exome sequencing identify inherited predispositions to life-threatening conditions, such as BRCA1 and BRCA2 mutations linked to hereditary breast and ovarian cancer.
  • Biosensors and Point-of-Care Biomarkers: Recombinant antibodies and microfluidic biochips facilitate rapid diagnostic platforms for vector-borne infections (e.g., dengue, malaria) and early detection of cardiac necrosis biomarkers.

Curing Life-Threatening Diseases

Biotechnology offers curative pathways by targeting disease etiologies at the cellular and genetic levels rather than providing symptomatic containment.

  • Targeted Gene Editing (CRISPR-Cas9): Gene scissors correct defective genetic mutations at the DNA level. Therapies like Casgevy provide a functional genetic cure for monogenic red blood cell disorders, including severe Sickle Cell Disease and Transfusion-Dependent Beta-Thalassemia.
  • Chimeric Antigen Receptor (CAR) T-Cell Therapy: Patient T-cells are genetically re-engineered ex vivo with chimeric antigen receptors to locate and eliminate malignant cells. Indigenous therapies like NexCAR19 provide advanced immunotherapy for refractory B-cell lymphomas and leukemias.
  • Monoclonal Antibodies (mAbs): Engineered cloned immunoglobulins bind selectively to specific oncogenic antigens or cell-surface receptors (e.g., Trastuzumab targeting HER2-positive breast cancer), neutralizing malignant proliferation without systemic cytotoxicity.
  • Stem Cell and Recombinant Therapeutics: Hematopoietic stem cell transplantation enables bone marrow regeneration in leukemias, while recombinant DNA technology synthesizes vital physiological molecules such as human insulin (Humulin) and recombinant clotting Factor VIII for hemophilia patients.

Conclusion

While biotechnology offers transformative therapeutic paradigms, high development costs and complex delivery mechanisms present significant affordability barriers. National initiatives such as the National Biopharma Mission are pivotal for scaling indigenous manufacturing, ensuring equitable clinical access to next-generation genomic medicine.

Key facts to remember

definition
CAR-T Cell Therapy

A form of immunotherapy where a patient's T-cells are genetically modified in a laboratory to express chimeric antigen receptors, directing them to recognize and kill cancer cells.

example
NexCAR19

India's first domestically developed CAR-T cell therapy, approved in 2023 for treating relapsed or refractory B-cell lymphomas and leukemia at significantly reduced costs compared to global alternatives.

example
Casgevy

The world's first approved CRISPR-Cas9-based gene editing therapy, developed to functionally cure sickle cell disease and transfusion-dependent beta-thalassemia.

scheme
National Biopharma Mission

An industry-academia collaborative mission by the Department of Biotechnology (DBT) and BIRAC to accelerate the discovery and manufacturing of affordable biopharmaceuticals in India.

Frequently asked questions

How does CRISPR-Cas9 aid in diagnosing infectious diseases?

CRISPR diagnostics use Cas enzymes programmed with guide RNAs to identify target pathogen DNA or RNA sequences. Upon recognition, the enzyme cleaves a reporter molecule, producing a rapid fluorescent or paper-strip visual signal, as seen in India's FELUDA test.

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