Understanding Transgenes and Their Uses

This question asks us to match specific transgenes (genes introduced into an organism to change a trait) with their applications or the products they help create. To solve this, we need to know the common uses of these listed transgenes in biotechnology.

Analyzing the Matching Pairs

Let's examine each transgene from List-I and find its correct match from List-II based on scientific knowledge:

• (A) \(\alpha\)-1-antitrypsin: \(\alpha\)-1-antitrypsin is a protein that protects the lungs from damage. Deficiency of this protein can lead to emphysema. Transgenic animals (like sheep) have been developed to produce human \(\alpha\)-1-antitrypsin in their milk, which can then be used to treat individuals with this deficiency. Therefore, \(\alpha\)-1-antitrypsin is used to treat emphysema. This matches with (III) Treat emphysema.
• (B) cryIAc: cryIAc is a gene isolated from the bacterium Bacillus thuringiensis (Bt). This gene produces a protein (Bt toxin) that is toxic to certain insect pests, particularly lepidopterans like the cotton bollworm. Transgenic cotton plants expressing the cryIAc gene are resistant to cotton bollworms. This matches with (IV) Cotton bollworms.
• (C) Antisense RNA: Antisense RNA technology is a method used to inhibit gene expression. An antisense RNA molecule is complementary to a messenger RNA (mRNA) molecule. When the antisense RNA binds to the mRNA, it prevents the mRNA from being translated into a protein, effectively silencing the gene. This technology has been used to develop transgenic plants resistant to pests like nematodes, such as Meloidogyne incognita (root-knot nematode), by silencing genes essential for the nematode's survival in the plant. This matches with (I) Meloidogyne incognita.
• (D) cryIAb: cryIAb is another gene from Bacillus thuringiensis that produces a Bt toxin. This specific toxin is effective against certain insect pests, including the European corn borer, which is a major pest of corn crops. Transgenic corn plants expressing the cryIAb gene are resistant to the corn borer. This matches with (II) Corn borer.

Summary Table of Transgene Matches

Based on our analysis, the correct matching is: (A) - (III), (B) - (IV), (C) - (I), (D) - (II).

Identifying the Correct Option

Comparing this matching with the given options, we find that the sequence (A) - (III), (B) - (IV), (C) - (I), (D) - (II) corresponds to one of the provided choices.

Revision Table: Key Transgenes and Applications

Additional Information on Transgenic Organisms and Gene Technology

Transgenic organisms are organisms that have had foreign DNA (transgenes) introduced into their genome. This technology has revolutionized various fields, including medicine and agriculture.

• Biopharming: Producing pharmaceutical proteins, like \(\alpha\)-1-antitrypsin, in transgenic plants or animals is known as biopharming. This offers a potentially cost-effective way to produce therapeutic proteins on a large scale.
• Bt Crops: Transgenic crops expressing Bt toxin genes (like cryIAc and cryIAb) are widely used to reduce damage caused by insect pests, leading to increased yield and reduced reliance on chemical pesticides. The Bt toxin is specific to certain insect groups and is considered safe for humans and other non-target organisms because the activated toxin requires alkaline gut conditions, which are found in susceptible insects but not in humans or most other animals.
• RNA Interference (RNAi) / Antisense Technology: Antisense RNA technology is a form of RNA interference. In plants, this technology has been used to create resistance against viruses and nematodes by interfering with the expression of genes essential for the pest's survival or the disease's development. For example, silencing nematode-specific genes using antisense RNA prevents the nematode from establishing a successful infection in the transgenic plant.

These examples highlight how genetic engineering allows for the targeted modification of organisms for specific beneficial purposes, ranging from producing life-saving proteins to developing pest-resistant crops.