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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Rec8mei8
mei8, John Schimenti
MGI:3512754
Summary 4 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Rec8mei8/Rec8mei8 B6.Cg-Rec8mei8 MGI:5566678
hm2
Rec8mei8/Rec8mei8 involves: 129S4/SvJae * C57BL/6J MGI:3513298
cx3
Rec8mei8/Rec8mei8
Spo11tm1Mjn/Spo11tm1Mjn
involves: 129S4/SvJae * 129X1/SvJ * C57BL/6J MGI:5615728
cx4
Rad21ltm1Yow/Rad21ltm1Yow
Rec8mei8/Rec8mei8
involves: 129S4/SvJae * C57BL/6J * C57BL/6NCrlj * CBA/JNCrlj MGI:5615722


Genotype
MGI:5566678
hm1
Allelic
Composition
Rec8mei8/Rec8mei8
Genetic
Background
B6.Cg-Rec8mei8
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rec8mei8 mutation (1 available); any Rec8 mutation (25 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• defect in telomere-nuclear envelope attachment

cellular
• defect in telomere-nuclear envelope attachment




Genotype
MGI:3513298
hm2
Allelic
Composition
Rec8mei8/Rec8mei8
Genetic
Background
involves: 129S4/SvJae * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rec8mei8 mutation (1 available); any Rec8 mutation (25 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• despite an absence of synapsis between homologs in spermatocytes, 28%-35% of spermatocytes exhibit homolog pairing in the chromosome mid- and subtelomeric regions
• no spematocyte nuclei with 19 fully synapsed autosomes are detected (J:94208)
• regional splitting of axial elements is seen at the early zygotene stage but is suppressed in later stages when double-strand break markers accumulate in spermatocytes (J:209347)
• spermatogenesis arrests at meiotic prophase I with no postmeiotic spermatids seen in the seminiferous tubules (J:94208)
• spermatocytes form axial elements but they arrest at the leptotene/zygotene stage (J:209347)
• spermatocytes form axial elements but they arrest at the leptotene/zygotene stage with aberrant synaptonemal complex formation
• only residual ovaries are seen in 6 week old females
• at 5-6 weeks of age mutant testis are about 50% the size of wild-type
• both males and females are infertile

endocrine/exocrine glands
• only residual ovaries are seen in 6 week old females
• at 5-6 weeks of age mutant testis are about 50% the size of wild-type

cellular
• despite an absence of synapsis between homologs in spermatocytes, 28%-35% of spermatocytes exhibit homolog pairing in the chromosome mid- and subtelomeric regions
• no spematocyte nuclei with 19 fully synapsed autosomes are detected (J:94208)
• regional splitting of axial elements is seen at the early zygotene stage but is suppressed in later stages when double-strand break markers accumulate in spermatocytes (J:209347)
• spermatogenesis arrests at meiotic prophase I with no postmeiotic spermatids seen in the seminiferous tubules (J:94208)
• spermatocytes form axial elements but they arrest at the leptotene/zygotene stage (J:209347)
• spermatocytes form axial elements but they arrest at the leptotene/zygotene stage with aberrant synaptonemal complex formation




Genotype
MGI:5615728
cx3
Allelic
Composition
Rec8mei8/Rec8mei8
Spo11tm1Mjn/Spo11tm1Mjn
Genetic
Background
involves: 129S4/SvJae * 129X1/SvJ * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rec8mei8 mutation (1 available); any Rec8 mutation (25 available)
Spo11tm1Mjn mutation (2 available); any Spo11 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• spermatocytes exhibit axial element splitting in the zygotene-like stage
• synaptonemal complex formation is largely abolished in spermatocytes

cellular
• spermatocytes exhibit axial element splitting in the zygotene-like stage
• synaptonemal complex formation is largely abolished in spermatocytes




Genotype
MGI:5615722
cx4
Allelic
Composition
Rad21ltm1Yow/Rad21ltm1Yow
Rec8mei8/Rec8mei8
Genetic
Background
involves: 129S4/SvJae * C57BL/6J * C57BL/6NCrlj * CBA/JNCrlj
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rad21ltm1Yow mutation (1 available); any Rad21l mutation (34 available)
Rec8mei8 mutation (1 available); any Rec8 mutation (25 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
reproductive system
• males and females do not form either cohesion axes or chromosome axes
• spermatocytes exhibit enhanced bouquet arrest

cellular
• males and females do not form either cohesion axes or chromosome axes
• spermatocytes exhibit enhanced bouquet arrest





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last database update
08/02/2024
MGI 6.24
The Jackson Laboratory