Adaptive evolution of ASPM, a major determinant of cerebral cortical size in humans.

Bibliographic Collection: 
MOCA Reference, APE
Publication Type: Journal Article
Authors: Evans, Patrick D; Anderson, Jeffrey R; Vallender, Eric J; Gilbert, Sandra L; Malcom, Christine M; Dorus, Steve; Lahn, Bruce T
Year of Publication: 2004
Journal: Hum Mol Genet
Volume: 13
Issue: 5
Pagination: 489-94
Date Published: 2004 Mar 1
Publication Language: eng
ISSN: 0964-6906
Keywords: Adaptation, Biological, Animals, Base Sequence, Cerebral Cortex, Evolution, Molecular, Hominidae, Humans, Molecular Sequence Data, Mutation, Nerve Tissue Proteins, Phylogeny, Polymorphism, Genetic, Selection, Genetic, Sequence Analysis, DNA

A prominent trend in the evolution of humans is the progressive enlargement of the cerebral cortex. The ASPM (Abnormal spindle-like microcephaly associated) gene has the potential to play a role in this evolutionary process, because mutations in this gene cause severe reductions in the cerebral cortical size of affected humans. Here, we show that the evolution of ASPM is significantly accelerated in great apes, especially along the ape lineages leading to humans. Additionally, the lineage from the last human/chimpanzee ancestor to humans shows an excess of non-synonymous over synonymous substitutions, which is a signature of positive Darwinian selection. A comparison of polymorphism and divergence using the McDonald-Kreitman test confirms that ASPM has indeed experienced intense positive selection during recent human evolution. This test also reveals that, on average, ASPM fixed one advantageous amino acid change in every 300,000-400,000 years since the human lineage diverged from chimpanzees some 5-6 million years ago. We therefore conclude that ASPM underwent strong adaptive evolution in the descent of Homo sapiens, which is consistent with its putative role in the evolutionary enlargement of the human brain.

DOI: 10.1093/hmg/ddh055
Alternate Journal: Hum. Mol. Genet.