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Sphsr1C57BL/6NSlc
QTL Variant Detail
Summary
QTL variant: Sphsr1C57BL/6NSlc
Name: spermatocyte heat stress resistance 1; C57BL/6NSlc
MGI ID: MGI:3579345
QTL: Sphsr1  Location: unknown  Genetic Position: Chr1, cM position of peak correlated region/allele: 81.63 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 named Sphsr1 (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)

Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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last database update
11/12/2024
MGI 6.24
The Jackson Laboratory