Abstract
The GH gene cluster in marmoset, Callithrix jacchus, comprises eight GH-like genes and pseudogenes and appears to have arisen as a consequence of gene duplications occurring independently of those leading to the human GH gene cluster. We report here the complete sequence of the marmoset GH gene locus, including the intergenic regions and 5′ and 3′ flanking sequence, and a study of the multiple GH-like genes of an additional New World monkey (NWM), the white-fronted capuchin, Cebus albifrons. The marmoset sequence includes 945 nucleotides (nt) of 5′ flanking sequence and 1596 nt of 3′ flanking sequence that are “unique”; between these are eight repeat units, including the eight GH genes/pseudogenes. The breakpoints between these repeats are very similar, indicating a regular pattern of gene duplication. These breakpoints do not correspond to those found in the much less regular human GH gene cluster. This and phylogenetic analysis of the repeat units within the marmoset gene cluster strongly support the independent origin of these gene clusters, and the idea that the episode of rapid evolution that occurred during GH evolution in primates preceded the gene duplications. The marmoset GH gene cluster also differs from that of human in having fewer and more evenly distributed Alu sequences (a single pair in each repeat unit) and a “P-element” upstream of every gene/pseudogene. In human there is no P-element upstream of the gene encoding pituitary GH, and these elements have been implicated in placental expression of the other genes of the cluster. The GH gene clusters in marmoset and capuchin appear to have arisen as the consequence of a single-gene duplication event, but in capuchin there was then a remarkable expansion of the GH locus, giving at least 40 GH-like genes and pseudogenes. Thus even among NWMs the GH gene cluster is very variable.
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We thank Drs. Jeremy Slightom, Nick Mundy, Joseph Martial, and David Hunt for gifts of genomic libraries and DNA.
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[Reviewing Editor: Nicolas Galtier]
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Wallis, O.C., Wallis, M. Evolution of Growth Hormone in Primates: The GH Gene Clusters of the New World Monkeys Marmoset (Callithrix jacchus) and White-Fronted Capuchin (Cebus albifrons). J Mol Evol 63, 591–601 (2006). https://doi.org/10.1007/s00239-006-0039-5
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DOI: https://doi.org/10.1007/s00239-006-0039-5