Correct Option (a)
RNA interference (RNAi) is a natural cellular mechanism that silences specific genes by degrading messenger RNA (mRNA) before it can be translated into protein, or by inhibiting its translation. This mechanism has gained popularity due to its diverse applications in biotechnology and medicine.
- Statement 1: RNAi is fundamentally a gene silencing mechanism. This property is being harnessed to develop targeted therapies for various genetic and infectious diseases by selectively turning off disease-causing genes.
- Statement 2: RNAi-based approaches are under investigation for cancer treatment. These therapies aim to silence oncogenes (genes that promote cancer) or genes critical for tumor growth and proliferation, offering a targeted therapeutic strategy.
- Statement 4: RNAi technology is employed in agriculture to develop crop plants resistant to pathogens, including viruses. By introducing RNA sequences that trigger an RNAi response against viral genes, plants can be engineered to inhibit viral replication and enhance disease resistance.
Incorrect Options
- Statement 3: Hormone replacement therapies (HRT) involve supplementing the body with hormones that are deficient, such as estrogen or insulin. This therapeutic approach does not utilize gene silencing mechanisms or RNA interference. RNAi is not involved in the direct supplementation of hormones.
- Option (b) (2 and 3), Option (c) (1 and 3), and Option (d) (1 and 4 only) are incorrect because they either include the incorrect statement 3 or exclude valid applications of RNAi technology as described in statements 1, 2, and 4.