The Structure, Complexity, and Evolution of Intermediate Filament Genes
The foregoing chapters in this book have directly or indirectly posed many fundamental questions pertaining to the mechanisms by which the expression of intermediate filament (IF) genes is regulated during development and differentiation. A consensual hypothesis established repeatedly in this book suggests that the morphological similarity of IF resides in the highly conserved secondary structure of the rod domains of all IF chains. The end domains, which vary widely in size and amino acid sequence among IF chains (Table I), are thought to occupy peripheral positions on intact IF where they are intimately involved in the functions of the IF in cells (Steinert et. al., 1985a; Steinert and Roop, 1988). Accordingly, the fundamental role of IF gene expression is to generate a particular set of exposed end domains, coupled to specific rod domains, that admit the functions of the IF required by the cell in which they occur.
KeywordsArthritis Albumin Codon Tyrosine Recombination
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