Molecular studies of marsupial X chromosomes reveal limited sequence homology of mammalian X-linked genes

David C. Kaslow, Barbara R. Migeon, M. G. Persico, Massimo Zollo, John L. VandeBerg, Paul B. Samollow

    Research output: Contribution to journalArticle

    20 Scopus citations

    Abstract

    To explore the extent to which the X chromosome has been conserved during mammalian evolution, we compared six loci that are X-linked in the human genome with the corresponding genes of the North American marsupial, the Virginia opossum (Didelphis virginiana). Our analysis shows that in the opossum genome there are sequences highly homologous to those of human cDNAs for housekeeping genes, glucose-6-phosphate dehydrogenase (G6PD), hypoxanthine phosophoribosyltransferase (HPRT), phosphoglycerate kinase A (PGK1), and α-galactosidase A (GLA). However, ornithine transcarbamylase and blood clotting Factor IX-tissue-specific genes that are X-linked in eutherians mammals-have no highly conserved homologs in the marsupial genome. By cloning opossum G6PD and HPRT, we found that these genes are X-linked in the opossum and that homologous sequences are limited to coding regions. As all genomic fragments hybridizing with the human GLA probe show dosage effects, it is likely that the opossum counterpart is X-linked. Finally, the pattern of hybridization suggests that the autosomal pseudogenes of HPRT and PGK1 in the opossum have remained mained highly homologous to the human X-linked genes.

    Original languageEnglish (US)
    Pages (from-to)19-28
    Number of pages10
    JournalGenomics
    Volume1
    Issue number1
    DOIs
    StatePublished - Sep 1987

    ASJC Scopus subject areas

    • Genetics

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    Kaslow, D. C., Migeon, B. R., Persico, M. G., Zollo, M., VandeBerg, J. L., & Samollow, P. B. (1987). Molecular studies of marsupial X chromosomes reveal limited sequence homology of mammalian X-linked genes. Genomics, 1(1), 19-28. https://doi.org/10.1016/0888-7543(87)90100-5