Structure and evolution of the human involucrin gene

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Involucrin is a protein found in keratinocytes.
• It is cross-linked to membrane proteins by transglutaminase.
• Involucrin plays a role in forming the cell envelope.

Purpose of the Study:

• To clone and sequence the human involucrin gene.
• To analyze the genetic structure of involucrin.
• To understand the evolutionary origins of involucrin.

Main Methods:

• Gene cloning and sequencing.
• Analysis of nucleotide and amino acid sequences.
• Identification of repetitive DNA sequences and their evolutionary relationships.

Main Results:

• The human involucrin gene was successfully cloned and sequenced.
• A central coding region with 39 repeats of a 30 nucleotide sequence was identified.
• Homology between the central and flanking segments suggests a process of repeated gene duplication and mutation.

Conclusions:

• The evolution of involucrin, a key component of the epidermal cell envelope, is attributed to gene duplication and mutation.
• The repetitive structure of the involucrin gene likely facilitated its adaptation as a transglutaminase substrate.
• Understanding involucrin's genetic basis provides insights into epidermal differentiation and barrier function.