Mutation

Mutation refers to a permanent change in DNA sequence that may occur spontaneously during replication or be induced by environmental factors such as radiation, chemicals, or viral integration. Mutations can involve single nucleotide substitutions, insertions, deletions, copy number changes, or chromosomal rearrangements, and they may occur in germline cells where they are heritable or in somatic cells contributing to acquired diseases. In cancer biology, accumulated somatic mutations drive malignant transformation by activating oncogenes or disabling tumour suppressor genes.

The biopharmaceutical industry places mutation analysis at the centre of precision medicine, particularly in oncology and rare genetic diseases. Targeted therapies are developed to inhibit proteins encoded by mutated genes, with companion diagnostics identifying eligible patients through mutation detection in tumour tissue or liquid biopsy. Mutation profiling guides treatment selection, predicts resistance mechanisms, and supports monitoring of disease evolution during therapy. In rare diseases, identifying causal mutations enables development of gene therapies, antisense oligonucleotides, or enzyme replacement strategies addressing underlying defects. Regulatory pathways increasingly incorporate mutation-based stratification in trial design and labelling, reflecting the growing importance of genetic information in clinical decision-making.