Remodeling of the involucrin gene during primate evolution

Area of Science:

• Evolutionary biology
• Molecular genetics
• Primate genomics

Background:

• Involucrin is a key protein in epidermal terminal differentiation.
• Primate involucrin gene evolution is not well understood.
• Comparative genomics can reveal evolutionary mechanisms.

Purpose of the Study:

• To investigate the evolutionary divergence of the primate involucrin gene.
• To compare the nucleotide sequences of lemur and human involucrin genes.
• To understand the formation of species-specific repeat structures.

Main Methods:

• Comparative nucleotide sequence analysis of lemur and human involucrin genes.
• Identification and comparison of ancestral and species-specific coding segments.
• Analysis of repeat structures within the gene.

Main Results:

• The involucrin gene shows unusual evolutionary patterns in primates.
• Both lemur and human genes share an ancestral coding segment.
• Lemur and human genes possess distinct species-specific repeat segments derived from the ancestral sequence.
• Lemur repeats originate from a different ancestral location than human repeats.

Conclusions:

• The primate involucrin gene has evolved through the development of species-specific repeat segments.
• These distinct repeat structures suggest alternative evolutionary strategies for the involucrin molecule.
• The human repeat segment likely evolved after the divergence of higher primates from prosimians.