Phenotypes associated with this allele
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Gopctm1.1Tno mutation
(1 available);
any
Gopc mutation
(25 available)
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reproductive system
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• spermatozoa tail coiling is abnormal, the mitochondrial sheath is stratified and outer dense fibers are absent
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cellular
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• spermatozoa tail coiling is abnormal, the mitochondrial sheath is stratified and outer dense fibers are absent
|
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Gopctm1.1Tno mutation
(1 available);
any
Gopc mutation
(25 available)
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Ultrastructural analysis of spermatogenic cells from wild type and Gopctm1.1Tno/Gopctm1.1Tno mice
reproductive system
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• at 20 weeks of age, sperm motility is significantly reduced (6.9% +/-4.4% compared to 59.3% +/-7.5% in control sperm)
• most motile sperm present display only sluggish movement
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• defects in spermatogenesis are noted as early as step 2-3 spermatids, when fragmentation of acrosomal caps is already observed
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• an abnormal arrangement of mitochondria in the mitochondrial sheath is observed
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• some mutant epididymidal spermatozoa have their tails coiled around their nuclei; also observed in mature testicular spermatids
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• early round spermatids exhibit fragmentation of the acrosomal cap and abnormal large vesicles caused by defective fusion of the Golgi-derived transport vesicles to the acrosome
• elongated spermatids and epididymal spermatozoa display prominent acrosome vacuolization, loss of adhesion to the nucleus, and total acrosome loss
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• all mutant epididymidal spermatozoa exhibit a round or ovoid head shape; also observed in mature testicular spermatids
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• in some cases, a complete loss of acrosomes is observed
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• loss of adhesion to the nucleus is often observed
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• all elongated spermatids and epididymal spermatozoa display malformed nuclei with a round or ovoid morphology
• occasional vacuolization or invagination give the nucleus a crescent-shaped structure
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• male homozygotes are sterile
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• intracytoplasmic sperm injection (ICSI) of abnormal mutant sperm into oocytes results in cleavage into blastocysts only when injected oocytes are stimulated electrically 30 min after ICSI
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cellular
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• an abnormal arrangement of mitochondria in the mitochondrial sheath is observed
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• some mutant epididymidal spermatozoa have their tails coiled around their nuclei; also observed in mature testicular spermatids
|
|
• early round spermatids exhibit fragmentation of the acrosomal cap and abnormal large vesicles caused by defective fusion of the Golgi-derived transport vesicles to the acrosome
• elongated spermatids and epididymal spermatozoa display prominent acrosome vacuolization, loss of adhesion to the nucleus, and total acrosome loss
|
|
• all mutant epididymidal spermatozoa exhibit a round or ovoid head shape; also observed in mature testicular spermatids
|
|
• in some cases, a complete loss of acrosomes is observed
|
|
• loss of adhesion to the nucleus is often observed
|
|
• all elongated spermatids and epididymal spermatozoa display malformed nuclei with a round or ovoid morphology
• occasional vacuolization or invagination give the nucleus a crescent-shaped structure
|
|
• at 20 weeks of age, sperm motility is significantly reduced (6.9% +/-4.4% compared to 59.3% +/-7.5% in control sperm)
• most motile sperm present display only sluggish movement
|