Interspecific backcross mice show sex-specific differences in allelic inheritance.
Transmission distortion is identified as a difference in transmission frequency of two alleles from the normal 1:1 Mendelian segregation in diploid organisms. Transmission distortion can extend over part or all of a chromosome. The recent development of interspecific mouse backcrosses has provided a powerful method for multilocus mapping of entire chromosomes in a single cross, and consequently for identifying distortions in allelic inheritance. We used an interspecific backcross of [(C57BL/6J x Mus spretus)F1 x C57BL/6J] mice to map molecular loci to mouse chromosome 2 and had previously found that the distal region of the chromosome showed distortions in allelic inheritance. We now report the mapping of five loci (Actc-1, D2Hgu1, His-1, Hox-4.1 and Neb) to chromosome 2, which, in addition to the Abl, Ada, B2m, Bmp-2a, Hc, Emv-15, Fshb, Hck-1, Pax-1, Pck-1, Spna-2 and Vim loci previously mapped in our interspecific backcross, serve as markers to measure allelic inheritance along approximately 75% of mouse chromosome 2. Statistical analyses are used to identify and delimit chromosomal regions showing transmission distortion and to determine whether there are sex-specific differences in allelic inheritance. These studies provide evidence for sex-specific differences in allelic inheritance for chromosome 2 and suggest biological explanations for this form of transmission distortion.
Siracusa
L D
LD
Mammalian Genetics Laboratory, NCI-Frederick Cancer Research and Development Center, Maryland 21702.
Alvord
W G
WG
Bickmore
W A
WA
Jenkins
N A
NA
Copeland
N G
NG
D000483:Alleles; D000818:Animals; D015139:Blotting, Southern; D016009:Chi-Square Distribution; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005260:Female; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009115:Muridae / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics; D011995:Recombination, Genetic; D012044:Regression Analysis; D012727:Sex Characteristics; D013045:Species Specificity