Mapping Data

Experiment

• Experiment
  TEXT-QTL
• Chromosome
  X
• Reference
  J:94029 Elliott RW, et al., Loci affecting male fertility in hybrids between Mus macedonicus and C57BL/6. Mamm Genome. 2004 Sep;15(9):704-10
• ID
  MGI:3512250

Genes

Gene	Assay Type
Mhstq2	visible phenotype
Hprt1	reported elsewhere
DXMit55	PCR amplified length variant
DXMit63	PCR amplified length variant
Xydsq	visible phenotype
DXMit31	PCR amplified length variant
Bywq	visible phenotype
DXMit128	PCR amplified length variant

Notes

• Experiment
  Hybrid sterility occurs in F1 males of M. macedonius mated to inbred strains. The testes weight of parental strain C57BL/6J is 0.23 g and the testes weight of parental strain M. macedonius is 0.22 g. The testes weight of F1 males is 0.06 g. Linkage analysis was performed on 140 male animals from a (C57BL/6J x M. macedonius)F1 x C57BL/10J backcross. 92 SSLP markers were used in the genome scan; at least 3 loci were typed for each chromosome. Testes from 8-20 week old backcross animals were weighed and analyzed cytologically.
  
  Linkage to testes weight mapped to proximal mouse Chromosome X near Hprt1 at 17 cM (LOD=7.9). This locus is named Mhstq2. The QTL range of Mhstq2 is broad and spans approximately 1.4 cM - 43.2 cM. This locus accounts for 22% of the phenotypic variation. Mhstq2 was confirmed using congenic animals. (C57BL/6J x M. macedonius)F1 x C57BL/10J females were backcrossed to C57BL/6J for 6 generations while selecting for M. macedonius alleles at DXMit55 (1.4 cM), DXMit23 (17 cM), and DXMit63 (38 cM). The resulting congenic line carries M. macedonius DNA from 1.4 cM - 38 cM on a C57BL/6J background and is designated B.MAC-X(1-38) by the authors. Congenic males are sterile and the average testes weight is 0.052. Cytological analysis of the testes show that most congenic males do not undergo meiotic metaphase I. In most congenic males no sperm heads are present. In rare cases abnormal sperm heads are observed.
  
  The distal end of chromosome X shows linkage to X/Y dissociation of the pseudoautosomal region (PAR). This locus is named Xydsq (X/Y dissociation QTL). Peak linkage to X/Y dissociation occurs at 72 cM near DXMit31 (LOD=4.6). This locus accounts for 42% of the variation of X/Y dissociation.
  
  Linkage to body weight was detected at 34.7 cM near DXMit128 (LOD=4.2) and is named Bywq (body weight QTL). This locus accounts for 12% of the variation in body weight. A previously identified body weight QTL, Bw2 (34 cM), maps near Bywq.