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Molecular Evolution of Prolactin in Primates

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Abstract

Pituitary prolactin, like growth hormone (GH) and several other protein hormones, shows an episodic pattern of molecular evolution in which sustained bursts of rapid change contrast with long periods of slow evolution. A period of rapid change occurred in the evolution of prolactin in primates, leading to marked sequence differences between human prolactin and that of nonprimate mammals. We have defined this burst more precisely by sequencing the coding regions of prolactin genes for a prosimian, the slow loris (Nycticebus pygmaeus), and a New World monkey, the marmoset (Callithrix jacchus). Slow loris prolactin is very similar in sequence to pig prolactin, so the episode of rapid change occurred during primate evolution, after the separation of lines leading to prosimians and higher primates. Marmoset prolactin is similar in sequence to human prolactin, so the accelerated evolution occurred before divergence of New World monkeys and Old World monkeys/apes. The burst of change was confined largely to coding sequence (nonsynonymous sites) for mature prolactin and is not marked in other components of the gene sequence. This and the observations that (1) there was no apparent loss of function during the episode of rapid evolution, (2) the rate of evolution slowed toward the basal rate after this burst, and (3) the distribution of substitutions in the prolactin molecule is very uneven support the idea that this episode of rapid change was due to positive adaptive selection. In the slow loris and marmoset there is no evidence for duplication of the prolactin gene, and evidence from another New World monkey (Cebus albifrons) and from the chimpanzee and human genome sequences, suggests that this is the general position in primates, contrasting with the situation for GH genes. The chimpanzee prolactin sequence differs from that of human at two residues and comparison of human and chimpanzee prolactin gene sequences suggests that noncoding regions associated with regulating expression may be evolving differently from other noncoding regions.

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Acknowledgments

We thank Dr. David Hunt, Dr. Ya-Ping Zhang, Dr. Jeremy Slightom, and Dr. Joseph Martial for providing DNA samples, genomic libraries, and plasmids.

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Author notes

  1. Akofa O. Mac-Kwashie

    Present address: Department of Clinical Microbiology, University Hospital, Uppsala, SE-751 85, Sweden

  2. Georgia Makri

    Present address: Hellenic Pasteur Institute, Vas. Sofias 127, Athens, 11521, Greece

Authors and Affiliations

  1. Biochemistry Department, School of Life Sciences, University of Sussex, Brighton, BN1 9QG, UK

    O. Caryl Wallis, Akofa O. Mac-Kwashie, Georgia Makri & Michael Wallis

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  1. O. Caryl Wallis
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Correspondence to O. Caryl Wallis.

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Wallis, O.C., Mac-Kwashie, A.O., Makri, G. et al. Molecular Evolution of Prolactin in Primates. J Mol Evol 60, 606–614 (2005). https://doi.org/10.1007/s00239-004-0239-9

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  • DOI: https://doi.org/10.1007/s00239-004-0239-9

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