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Phenotypes Associated with This Genotype
Genotype
MGI:2654457
Allelic
Composition
Ube2btm1Jhjh/Ube2btm1Jhjh
Genetic
Background
involves: 129P2/OlaHsd * FVB/NJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ube2btm1Jhjh mutation (0 available); any Ube2b mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
N
• females are fertile
• 4-fold increase in the number of apoptotic cells in the seminiferous tubules at 6 weeks of age
• apoptotic cells are clustered and primarily localized in germ cell layers that contain primary spermatocytes
• spermatozoa appear almost immotile, with a few displaying sluggish progressive or nonprogressive motility
• marked but variable reduction in testis weight
• defect in the elongation and nuclear condensation stage of spermiogenesis with the shedding of immature germ cells
• epididymal sperm counts are less than 10% of the numbers found in control mice
• more than 90% of spermatozoa are morphologically abnormal
• deformation of the sperm midpiece
• at least 70% of spermatozoa exhibit an aberrant head morphology, in most cases combined with middle piece deformation
• increased apoptosis of primary spermatocytes

endocrine/exocrine glands
• marked but variable reduction in testis weight

cellular
• epididymal sperm counts are less than 10% of the numbers found in control mice
• more than 90% of spermatozoa are morphologically abnormal
• deformation of the sperm midpiece
• at least 70% of spermatozoa exhibit an aberrant head morphology, in most cases combined with middle piece deformation
• increased apoptosis of primary spermatocytes
• 4-fold increase in the number of apoptotic cells in the seminiferous tubules at 6 weeks of age
• apoptotic cells are clustered and primarily localized in germ cell layers that contain primary spermatocytes
• spermatozoa appear almost immotile, with a few displaying sluggish progressive or nonprogressive motility


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
03/25/2025
MGI 6.24
The Jackson Laboratory