Sphsr2^C57BL/6NSlc
QTL Variant Detail

Summary

• QTL variant: Sphsr2^C57BL/6NSlc
• Name: spermatocyte heat stress resistance 2; C57BL/6NSlc
• MGI ID: MGI:3579347
• QTL: Sphsr2 Location: unknown Genetic Position: Chr11, cM position of peak correlated region/allele: 40.59 cM
• QTL Note: genome coordinates based on the marker associated with the peak LOD score

Variant origin

• Strain of Specimen: C57BL/6NSlc

Variant description

• Allele Type: QTL

Notes

Mapping and Phenotype information for this QTL, its variants and associated markers

J:97669

Male animals from inbred strain MRL/MpJSlc exhibit heat stress-resistant spermatocytes. To map genetic loci associated with this phenotype, linkage analysis was performed on 140 male animals from a (C57BL/6CrSlc x MRL/MpJSlc)F2 intercross. 98 microsatellite markers at an average spacing of 10-20 cM were used for the genome scan. To expose spermatocytes to abdominal heat, unilateral experimental cryptorchidism was induced in male animals by surgery. Three weeks after surgery parental strain C57BL/6CrSlc displayed germ cell loss and reduced Sertoli cell index compared to MRL/MpJSlc males.

A locus on mouse Chromosome 1 near D1Mit403 (100 cM) showed significant linkage to testis weight ratio (LOD=13.08) and Sertoli cell index (LOD=8.3). This locus is namedSphsr1 (spermatocyte heat stress resistance 1). A strong candidate gene for Sphsr1 is Exo1 at 97 cM. A mutation in Exo1 in MRL/MpJ animals has previously been shown to be involved in spermatocyte heat stress resistance.

A locus on mouse Chromosome 11 near D11Mit5 (37 cM) showed significant linkage to testis weight ratio (LOD=2.8). This locus is named Sphsr2 (spermatocyte heat stress resistance 2).

Suggestive linkage to testis weight ratio mapped to mouse Chromosomes 2 (D2Mit107; 75.6 cM), 4 (D4Mit235; 1.9 cM), 7 (D7Mit178; 0.5 cM), 9 (D9Mit181; 48 cM), 11 (D11Mit212; 50 cM), and 15 (D15Mit245; 58.9 cM). Suggestive linkage to Sertoli cell index mapped to mouse Chromosomes 4 (D4Mit235; 1.9 cM) and 8 (D8Mit50; 41 cM).

References

• Original: J:97669 Namiki Y, et al., Quantitative trait loci analysis of heat stress resistance of spermatocytes in the MRL/MpJ mouse. Mamm Genome. 2005 Feb;16(2):96-102
• All: 1 reference(s)