A detailed linkage map of subtelomeric murine chromosome 12 region including the situs inversus mutation locus IV.
A mouse model is an invaluable tool to tackle genesis of human congenital diseases that have so far eluded human studies. Homozygote for the i.v. mutation, the murine Si/Col strain presents a left-right lateralization defect of thoracic and abdominal organs and heart defects very similar to human ones. This i.v. mutation has been mapped to the region between the Aat and Igh-C loci, suggesting the presence of an equivalent human gene in the human syntenic 14q3 region. A precise linkage map of the region is, therefore, of great interest since it will contribute to the genetic approach of the i.v. gene. Analysis of 242 back-cross progeny from Mus musculus (MAI) or spretus strains of mice and SI/Col mice has allowed mapping of the i.v. gene to a linkage group of eight markers. It includes four genes: Aat (alpha 1-antitrypsin), Ckb (creatine kinase, brain form), Crip (cysteine-rich intestinal protein), and Igh-C (immunoglobulin heavy chain constant region complex); three murine microsatellites: D12Mit6, D12Mit7, and D12Mit8; and one new marker, D12Mtp1, defined by a minisatellite human probe, pYNZ2. After analysis of the data by the LINKAGE program, the following multilocus map has been constructed: centromere-D12Mit6-6.9 cM-D12Mit7-1.7 cM-D12Mtp1-2.6 cM-Aat-5.0 cM-(Ckb, Igh-C)-0.4 cM-D12Mit8-0.4 cM-Crip-11.2 cM-i.v.-telomere. This map differs from the previous map in placing i.v. locus telomeric to Igh-C. D12Mit6 and D12Mit7 are now precisely mapped centromeric to the locus Aat. In addition, a new locus D12Mtp1 is located between Aat and D12Mit7.
Centre de Recherche de Biochimie Macromoléculaire, CNRS UPR-9008 et INSERM U249, Montpellier, France.
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A
de Meeus
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S
Alonso
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J
Demaille
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P
Bouvagnet
D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D004247:DNA; D005260:Female; D008040:Genetic Linkage; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D009115:Muridae; D009154:Mutation; D010641:Phenotype; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012857:Situs Inversus / Q000235:genetics*; D016615:Telomere
D004247:DNA