Analysis of allele segregation distortion in a swine resource family.
Segregation distortion of alleles was found in several regions of the genome in allele type analyses of genetic markers for a swine resource family that had been constructed by crossing Göttingen miniature pig and Meishan breeds. From these regions, a region on chromosome 6 presented a distortion over several consecutive markers. This chromosome 6 region was subsequently further investigated to reveal that alleles of a chromosome 6 homologue of the Gottingen miniature pig were not found in a homozygous family member. The litter size of F1-crosses which were able to produce homozygotes in this region were 24% smaller, on average, than F1-crosses which were unable to produce homozygotes. This indicated that this region of the chromosome 6 homologue contained a recessive gene or genes which could terminate fetal development. An additional 10 markers were subsequently used to investigate the region more precisely. These studies revealed that this region spans 7 cM and is located between markers Sw855 and Sw122. Since current comparative maps show that this region corresponds to the human chromosome 19 q-arm, genes positioned on the human chromosome 19 q-arm were screened to select 20 candidate genes. These included the pregnancy-specific beta-1-glycoprotein gene.
Yasue
H
H
Department of Animal Breeding and Genetics, National Institute of Animal Industry, MAFF, Japan. hyasue@niai.affrc.go.jp
Mikawa
S
S
Uenishi
H
H
Wada
Y
Y
D000483:Alleles; D000818:Animals; D002874:Chromosome Mapping; D005314:Embryonic and Fetal Development / Q000235:genetics*; D005260:Female; D005819:Genetic Markers; D006801:Humans; D008297:Male; D009154:Mutation; D010375:Pedigree; D017385:Sequence Homology; D013552:Swine / Q000235:genetics*
D005819:Genetic Markers