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The germ cell deficient locus maps to mouse chromosome 11A2-3
M K Duncan1, J Lieman, K K Chada
1National Eye Institute, Laboratory of Molecular and Developmental Biology, Bethesda, Maryland 20892-2730, USA.
Summary
The germ cell deficient (gcd) mouse mutation causes infertility due to defective primordial germ cell development. This study mapped the gcd locus to mouse Chromosome 11A2-3, aiding future research into related human reproductive disorders.
Area of Science:
- Genetics
- Developmental Biology
- Reproductive Biology
Background:
- The autosomal recessive germ cell deficient (gcd) mutation in mice leads to infertility in both sexes.
- This infertility is linked to improper migration and/or proliferation of primordial germ cells during embryonic development.
- Mice with the gcd mutation are potential models for human premature ovarian failure and Sertoli cell only syndrome.
Purpose of the Study:
- To determine the chromosomal position of the gcd locus.
- To utilize this information for positional cloning and identification of candidate genes.
Main Methods:
- Fluorescent in situ hybridization (FISH) using the transgene as a probe.
- DAPI chromosomal banding.
- Double labeling with the alpha 1(I) collagen gene probe.
- Southern blot hybridization analysis.
Main Results:
- The gcd locus was mapped to mouse Chromosome (Chr) 11A2-3.
- Two candidate genes, Lif and Oncostatin M, were identified near the gcd locus.
- Southern blot analysis showed no gross rearrangements in Lif or Oncostatin M in gcd mice.
Conclusions:
- The precise chromosomal location of the gcd locus on Chr 11A2-3 has been established.
- This mapping provides a crucial landmark for positional cloning efforts.
- Further research can now focus on identifying other candidate genes in this region to understand the genetic basis of gcd-related infertility.