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Evolution of protamine P1 genes in primates.

Abstract：

:Protamine P1 genes have been sequenced by PCR amplification and direct DNA sequencing from 9 primates representing 5 major families, Cebidae (new world monkeys), Cercopithecidae (old world monkeys), Hylobatidae (gibbons), Pongidae (gorilla, orangutan, and chimpanzee), and Hominidae (human). In this recently diverged group of primates these genes are clearly orthologous but very variable, both at the DNA level and in their expressed amino acid sequences. The rate of variation amongst the protamine P1s indicates that they are amongst the most rapidly diverging polypeptides studied. However, some regions are conserved both in primates and generally in other placental mammals. These are the 13 N-terminal residues (including a region of alternating serine and arginine residues (the motif SRSR, res. 10-13) susceptible to Ser phosphorylation), a tract of six Arg residues (res. 24-29) in the center of the molecule, and a six-residue region (RCCRRR, res. 39-44), consisting of a pair of cysteines flanked by arginines. Detailed consideration of nearest-neighbor matrices and trees based on maximum parsimony indicates that P1 genes from humans, gorillas, and chimpanzees are very similar. The amino acid and nucleotide differences between humans and gorillas are fewer than those between humans and chimpanzees. This finding is at variance with data from DNA-DNA hybridization and extensive globin and mitochondrial DNA sequences which place human and chimpanzee as closest relatives in the super family, Hominoidea. This may be related to the fact that protamine P1s are expressed in germ line rather than somatic cells.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Mol Evol

journal_title

Journal of molecular evolution

authors

Retief JD,Winkfein RJ,Dixon GH,Adroer R,Queralt R,Ballabriga J,Oliva R

doi

10.1007/BF00178872

subject

Has Abstract

pub_date

1993-10-01 00:00:00

pages

426-34

issue

4

eissn

0022-2844

issn

1432-1432

journal_volume

37

pub_type

杂志文章

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