About   Help   FAQ
Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Chek2em4Gpt
endonuclease-mediated mutation 4, GemPharmatech Co., Ltd
MGI:7296917
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
cx1
Chek2em4Gpt/Chek2em4Gpt
Spidrem1Jzc/Spidrem1Jzc
involves: C57BL/6 * C57BL/6JGpt * DBA/2 MGI:8286391


Genotype
MGI:8286391
cx1
Allelic
Composition
Chek2em4Gpt/Chek2em4Gpt
Spidrem1Jzc/Spidrem1Jzc
Genetic
Background
involves: C57BL/6 * C57BL/6JGpt * DBA/2
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Chek2em4Gpt mutation (0 available); any Chek2 mutation (52 available)
Spidrem1Jzc mutation (0 available); any Spidr mutation (93 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• no spermatozoa are seen in the epididymis
• males show rescue of spermatogenesis, with diplotene and metaphase I cells in testes and the presence of post-meiotic cells which can escape the checkpoint elimination and develop into round or elongating spermatids, but fewer post-meiotic cells are seen than in wild-type males
• partial rescue of the oogenesis defects seen in single homozygous Spidr mutant females such that ovaries have follicles at various stages of oocyte development unlike single homozygous Spidr mutant females and oocyte loss is partially rescued such that females are able to produce more offspring than single homozygous Spidr mutants but still less than in wild-type females
• oocyte loss is partially rescued in adults, and females are able to produce more offspring than single homozygous Spidr mutant females within 6 months but still less than in wild-type females
• females exhibit partial rescue of the subfertility seen in single homozygous Spidr mutants such that females are able to produce more offspring than single homozygous Spidr mutants but still lower fertility than in wild-type females
• males, but not females, are infertile

cellular
• no spermatozoa are seen in the epididymis
• males show rescue of spermatogenesis, with diplotene and metaphase I cells in testes and the presence of post-meiotic cells which can escape the checkpoint elimination and develop into round or elongating spermatids, but fewer post-meiotic cells are seen than in wild-type males
• partial rescue of the oogenesis defects seen in single homozygous Spidr mutant females such that ovaries have follicles at various stages of oocyte development unlike single homozygous Spidr mutant females and oocyte loss is partially rescued such that females are able to produce more offspring than single homozygous Spidr mutants but still less than in wild-type females
• oocyte loss is partially rescued in adults, and females are able to produce more offspring than single homozygous Spidr mutant females within 6 months but still less than in wild-type females





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)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support.
last database update
01/28/2026
MGI 6.24
The Jackson Laboratory