Jumbled spine and ribs (Jsr) is an autosomal dominant mutation that results in malformation of the axial skeleton. The vertebrae of mutant mice (Jsr/+) are all shorter than those of normal mice (+/+) in the inbred line and show various abnormalities. In addition, several ribs are fused at their proximal region because of fusion of thoracic vertebrae. In this study, we localized the Jsr mutation on distal Chromosome (Chr) 5 and constructed a high-resolution map. Chromosomal mapping was performed with an inter-subspecific backcross of (CKH-Jsr/+× MOG) F1 carrying the Jsr allele and CKH-+/+. The predicted gene order around Jsr was determined to be cen–(Epo, Pdgfa, D5Mit31, D5Mit374)–(Jsr, Nfe2u, D5Mit99, D5Mit247, D5Mit284, D5Mit292, D5Mit327)–D5Mit328–tel. Subsequently, high-resolution mapping concluded the Jsr localization to be cen–Nfe2u–1.0cM–Jsr–0.2cM–D5Mit247,292–tel. Jsr/Jsr homozygotes are alive, as the mutation is not lethal. Based on histological analysis of mutant embryos, Jsr is hypothesized to be caused by abnormal development of primordial cells in the axial skeleton.
Mammalian Genome – Springer Journals
Published: Mar 1, 1999
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