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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID 		Tubb4bem1Visu
endonuclease-mediated mutation 1, Visvanathan Ramamurthy
MGI:8319140
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
ht1
 		Tubb4bem1Visu/Tubb4b+ C57BL/6J-Tubb4bem1Visu MGI:8319151


Genotype
MGI:8319151
ht1
Allelic
Composition		 Tubb4bem1Visu/Tubb4b+
Genetic
Background		 C57BL/6J-Tubb4bem1Visu
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tubb4bem1Visu mutation (0 available); any Tubb4b mutation (15 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
cellular
azoospermia ( J:354352 )
• no sperm cells in seminiferous tubules
abnormal spermatocyte morphology ( J:354352 )
• no spermatocytes beyond pachytene stage in testis

endocrine/exocrine glands

reproductive system
azoospermia ( J:354352 )
• no sperm cells in seminiferous tubules
abnormal spermatocyte morphology ( J:354352 )
• no spermatocytes beyond pachytene stage in testis




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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Send questions and comments to User Support. 		last database update
04/14/2026
MGI 6.24 		The Jackson Laboratory