Concept explainers
To describe:
The two phenomena that give rise to the diversity of adhesion molecules and to mention the additional phenomenon that gives rise to the diversity of integrins.
Introduction:
Within a cell, there is an adhesion molecule which is known as cadherin. Integrins are the major proteins that help to bind and send signals between cells.
Explanation of Solution
Adhesion of cells occurs by certain molecules like Cadherins, which involves calcium-dependent adhesion. Cadherins also help out in identifying the neighbouring cells. The cadherins are found almost in all parts like in cytoplasm, ECM, and trans-membrane. Cadherins act as receptors and as ligands because they are synthesized as poly-peptides.
The diversity of Cadherins: E-cadherin (epithelial cadherin) gets expressed at the early development phase. During neurulation, where the neural plates are being developed in the embryo, the tissues residing near the cranial neural folds have increased N-cadherin expression and E-cadherin decreases. Cadherins are placed in the cytoplasmic region and help in imparting the speciality of each. Alternate splicing also plays an important role in N-CAM diversity.
The diversity of Integrins: Integrins have trans-membrane receptors in groups. They attach the cell to the ECM or to the adjacent cells. As trans-membrane receptors, they regulate cell cycle, organisation, and transportation. Integrin has ( sub-unit and ( sub-unit which are glycoproteins associated with non-covalent links. Adhesion occurs by attachment of cytosolic protein called Talin to ( sub-unit. F3 domain of Talin is connected to the membranes of the distal region of the cytosolic integrin tail, which thereby leads to disunion of sub-unit integrins.
Thus, the phenomenon which gives rise to diversity of cadherins and integrins depends on the embryonic development and expression of the genes.
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