Identification and localization of two genes on the chicken Z chromosome: implication of evolutionary conservation of the Z chromosome among avian species |
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Authors: | Yasushi Saitoh Akira Ogawa Tetsuya Hori Ryota Kunita Shigeki Mizuno |
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Institution: | (1) the Laboratory of Molecular Biology, Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, 981 Sendai, Japan;(2) Present address: the Department of Molecular Biology and Biochemistry, Geneva University, 1211 Geneva 4, Switzerland |
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Abstract: | A cDNA clone containing an insert of about 3.4 kb, pCIREBP, was isolated from the chicken liver cDNA library and identified as a clone for the chicken homologue of iron-responsive element-binding protein (IREBP). The deduced amino acid sequence showed 88% identity with that of the mouse IREBP and 17 out of the 20 active site residues of the pig heart mitochondrial aconitase were conserved. Another cDNA clone, pZOV3, containing an insert of about 4.5 kb was isolated from the chicken ovary cDNA library. This cDNA contained an open reading frame for 327 amino acid residues, whose sequence had partial similarity to two immunoglobulin superfamily proteins; mouse GP-70 and chicken HT7. Fluorescencein situ hybridization using corresponding genomic clones revealed that both genes are localized on the Z chromosome; the ZOV3 gene at the middle of the short arm and the IREBP gene at the boundary of heterochromatin on the long arm. Southern blot hybridization to male and female genomic DNA preparations from six species representing five avian genera suggested that these two genes are Z-linked in all the species tested. |
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Keywords: | Gallus gallus domesticus Z chromosome IREBP gene ZOV3 gene immunoglobulin superfamily protein |
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