PMID: 8587135Dec 1, 1995Paper

A reassessment of mammalian alpha A-crystallin sequences using DNA sequencing: implications for anthropoid affinities of tarsier

Journal of Molecular Evolution
C J Jaworski

Abstract

alpha A-crystallin, a major structural protein in the ocular lenses of all vertebrates, has been a valuable tool for molecular phylogenetic studies. This paper presents the complete sequence for human alpha A-crystallin derived from cDNA and genomic clones. The deduced amino acid sequence differs at two phylogenetically informative positions from that previously inferred from peptide composition. This led us to examine the same region of the alpha A-crystallin gene in 12 other mammalian species using direct sequencing of PCR-amplified genomic DNA. New sequences were added to the database, and corrections were made to all anthropoid sequences, defining clear synapomorphies for anthropoids as a clade distinct from prosimians. Within the anthropoids there are further synapomorphies delineating hominoids, Old World monkeys, and New World monkeys. Significantly, sequence revisions and the addition of new sequence for a prosimian, the sifaka, eliminate the previous support for the proposed anthropoid affinities of the tarsier inferred from alpha A-crystallin protein sequences. In addition, DNA sequences provide greater resolution of certain relationships. For example, although they are identical in protein sequence, comparison of DNA...Continue Reading

Citations

Aug 26, 1998·Animal Biotechnology·N E BurkM F Rothschild
Oct 29, 2009·BMC Evolutionary Biology·Helen J ChatterjeeColin Groves
Aug 10, 2000·The Journal of Comparative Neurology·A HendricksonD Sajuthi
May 31, 2011·Journal of Human Evolution·Natalie M JamesonDerek E Wildman

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