39 public questions tagged with this topic.
Hemophilia is a sex-linked recessive disorder caused by a mutation in the X chromosome. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Mutations in PAX6 transcription factor cause aniridia, congenital absence or severe hypoplasia of iris, accompanied by corneal opacification, cataracts, foveal hypoplasia, and nystagmus. Pax6 continues expression in iris, cornea, retina throughout development maintaining ocular progenitor gene networks. Dominant haploinsufficiency reduces DNA binding to target promoters. Cataract alone typically results from crystallin mutations, retinal detachment from other causes, myopia polygenic. Aniridia represents classic dosage-sensitive phenotype of PAX6 linked to 11p13 deletion, demonstrating pleiotr
Ref: NCBI Bookshelf, Molecular Biology of Eye: PAX6 mutations causing aniridia and ocular anomalies.
ACA establishes positive feedback loop of cAMP signaling that organizes collective movement. Mutants lacking functional ACA fail to synthesize pulses, therefore no extracellular cAMP wave propagates, cells do not polarize, stream, or form mounds, and developmental program arrests early. Intracellular cAMP remains low, preventing induction of early genes like discoidin and contact site A. Phenotype includes lack of aggregation territory, no slug formation despite starvation. Normal aggregation patterns require ACA-mediated relay; excessive aggregation would require increased cyclase activity, w
Ref: Science, ACA null phenotype - failure to aggregate, cAMP pulse rescue and developmental arrest.
Adenosine deaminase deficiency autosomal recessive SCID became earliest successful gene therapy target due biological features favoring correction. Enzyme chromosome 20q13.12 deaminates adenosine to inosine and deoxyadenosine to deoxyinosine, deficiency leads accumulation deoxyadenosine converted deoxycytidine kinase to dATP elevated dATP allosterically inhibits ribonucleotide reductase essential dNTP synthesis DNA replication lymphocyte clonal expansion triggers apoptosis intrinsic pathway resulting absent T B NK cells. Lymphoid lineage provides selective advantage because corrected cells det
Ref: Lancet ADA First Gene Therapy NEJM 1990; NCBI SCID Gene Therapy History; NCERT Biotechnology Applications ADA Chapter 12.
Gene augmentation alias addition therapy provides supplemental functional copy gene compensating recessive loss-of-function mutation where endogenous loci produce truncated or misfolded protein rapidly degraded proteasome or nonsense-mediated decay. Delivered cDNA lacks introns and native regulatory elements codon-optimized enhancing translation and CpG depleted reducing TLR9 activation expressed under heterologous constitutive promoter chicken beta-actin with CMV enhancer or tissue-specific transthyretin promoter driving strong transcription independent defective locus that remains present bu
Ref: NIH Gene Augmentation Therapy Strategy; Watson Molecular Biology Gene Augmentation Chap 15; NCBI Bookshelf Gene Addition https://www.ncbi.nlm.nih.gov/books/NBK21981/.
Lysosomal storage disorders form a group of about seventy rare inherited metabolic diseases sharing unifying pathophysiology despite diverse enzyme defects. Mutations in genes encoding lysosomal acid hydrolases, accessory activator proteins GM2 activator and saposins, sulfatases requiring formylglycine modification by SUMF1, or lysosomal integral membrane transporters such as cystinosin and sialin impair specific catabolic steps. Because residual enzyme activity falls below threshold, typically less than ten percent of normal, undegraded macromolecular substrates such as sphingolipids, mucopol
Ref: Parenti et al., Nature Reviews Drug Discovery 2015: Lysosomal Storage Disorders – Substrate Accumulation.
PCR (Polymerase Chain Reaction) is used to amplify DNA, making it possible to detect genetic disorders_x000D_ early.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA
PCR (Polymerase Chain Reaction) is used for early detection of genetic disorders by amplifying specific_x000D_ DNA sequences.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Molecular Diagnosis - PCR ELISA
Gene therapy involves correcting genetic defects by introducing functional genes into cells.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Gene Therapy - ADA SCID
Gene therapy is a technique used to replace defective genes with functional ones to treat genetic_x000D_ disorders.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Gene Therapy - ADA SCID
Gene therapy is not limited to bacterial infections; it is primarily used to treat genetic disorders by_x000D_ correcting defective genes.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Gene Therapy - ADA SCID
Gene therapy is used to treat adenosine deaminase (ADA) deficiency by inserting a functional ADA gene.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Gene Therapy - ADA SCID
