Cytogenetic localization of 24 BACs containing type I (genes and ESTs) and type II (microsatellites) markers were used to construct cytogenetic maps of caprine (CHI) and bovine (BTA) X chromosomes. Comparison of these two maps revealed that the distal region of the goat X long arm (CHI Xq38→q42) was located inside the bovine X chromosome, between PGK1 (BTA Xq25) and DVEPC137 (BTA Xq12). The marker order was globally conserved without any pericentric inversion, as previously postulated in the literature. The caprine centromere was found between DVEPC053 and DVEPC102 (belonging to the same band in the bovine X: BTA Xq41), whereas the bovine centromere was between DVEPC076 and DVEPC132, belonging to the same region of the caprine X chromosome (CHI Xq31→q33). The pseudoautosomal region was situated at the tip of the bovine X long arm and on the tiny short arm of the caprine X chromosome. In the non-pseudoautosomal (NPA) region, the synteny of coding sequences was well conserved between the human species and the two ruminant species, but the gene order was dramatically divergent. It is suggested that the 24 BACs of this study could constitute a new tool to measure phylogenetic distances between different mammalian species by comparing chromosome rearrangements inside the NPA region of the X.

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