​Which one of the following options is a correct match between terms of Columns X and Y?

Correct option is A

​The correct associations are:

• Anchoring junction (A) → Desmoglein (iii): Anchoring junctions include desmosomes and adherens junctions, which use proteins like desmoglein (a cadherin protein) for cell-cell adhesion.
• Occluding junction (B) → Claudins (i): Tight junctions, which occlude passage between cells, rely on claudins and occludins for their function.
• Channel-forming junction (C) → Connexin (iv): Gap junctions are formed by connexin proteins, enabling intercellular communication via channels.
• Signal-relaying junction (D) → Delta-Notch (ii): Signal-relaying junctions involve signaling proteins like Delta and Notch in intercellular communication.

Information Booster:

1. Anchoring junctions provide mechanical stability and include desmosomes and adherens junctions.
2. Occluding junctions form barriers between cells, regulating paracellular transport.
3. Channel-forming junctions allow direct communication between cells via gap junctions.
4. Signal-relaying junctions are critical in developmental and intercellular signaling, including Delta-Notch signaling.
5. Junction-specific proteins include desmoglein (anchoring), claudins (tight junctions), connexins (gap junctions), and Delta-Notch (signal-relaying).

Additional Knowledge:

• Anchoring Junctions (A-iii):
  Desmoglein is a cadherin family protein found in desmosomes, anchoring adjacent cells together. These junctions are important in tissues subjected to mechanical stress, such as skin and heart.
• Occluding Junctions (B-i):
  Tight junctions are formed by claudins and occludins, creating a barrier to prevent the passage of molecules between cells. They are critical in epithelial and endothelial cells.
• Channel-forming Junctions (C-iv):
  Connexins assemble to form gap junctions, which create intercellular channels for the exchange of ions, nutrients, and signaling molecules.
• Signal-relaying Junctions (D-ii):
  Delta-Notch signaling is crucial in developmental pathways and cell differentiation. These junctions transmit signals between adjacent cells.