About   Help   FAQ
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





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)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support.
last database update
12/10/2024
MGI 6.24
The Jackson Laboratory