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Phenotypes Associated with This Genotype
Genotype
MGI:5439284
Allelic
Composition
Spaca1tm1.1Osb/Spaca1tm1.1Osb
Tg(Acr-EGFP)1Osb/0
Genetic
Background
involves: 129S2/SvPas * C3H * C57BL * C57BL/6 * DBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Spaca1tm1.1Osb mutation (1 available); any Spaca1 mutation (22 available)
Tg(Acr-EGFP)1Osb mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• abnormalities in acrosome formation are detected in spermatids at around step 6
• all round-headed testicular and cauda epididymal spermatozoa have an acrosome of negligible size
• a few spermatozoa have small aberrantly shaped acrosomes
• as around step 6 nuclei are smaller and accumulation of GFP in the acrosomal granule is not apparent

cellular
• all round-headed testicular and cauda epididymal spermatozoa have an acrosome of negligible size
• a few spermatozoa have small aberrantly shaped acrosomes
• as around step 6 nuclei are smaller and accumulation of GFP in the acrosomal granule is not apparent


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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Funding Information
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last database update
01/28/2026
MGI 6.24
The Jackson Laboratory