About   Help   FAQ
Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Mostm1Ev
targeted mutation 1, Martin L Evans
MGI:1857218
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Mostm1Ev/Mostm1Ev involves: 129S/SvEv MGI:2183304


Genotype
MGI:2183304
hm1
Allelic
Composition
Mostm1Ev/Mostm1Ev
Genetic
Background
involves: 129S/SvEv
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mostm1Ev mutation (3 available); any Mos mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
endocrine/exocrine glands
• ovarian cysts are found in 5 mutant females but not in wild-type (0/19) or heterozygous animals (0/10); incidence is high (4/7) in females older than 6 months
• cysts are serous, bilateral, multilocular in older mice and sometimes infiltrated with blood; smaller cysts are predominantly composed of epithelial tissue, while larger cysts (2/5) contain tissue types typical of a teratoma

reproductive system
N
• normal sperm count and spermatogenesis
• eggs isolated 18 hours after human chorionic gonadotropin treatment display 2 polar bodies and no pronuclei while egg from wild-type littermates have only one polar body
• eggs failed to arrest during meiosis, leading to spontaneous parthenogenetic activation (progress through meiosis II, germinal vesicle breakdown, extrusion of polar bodies, and cleavage)
• eggs isolated 18 hours after human chorionic gonadotropin treatment display 2 polar bodies and no pronuclei while egg from wild-type littermates have only one polar body (J:19118)
• ~40% of mutant eggs maintained in culture develop a pronucleus indicating parthenogenetic development; 30% of these cleave into 2 nucleated cells and occasionally to 4 cells (J:19118)
• mutant eggs that fail to cleave undergo cytoplasmic fragmentation which is not seen in wild-type eggs (J:19118)
• in Mos-deficient oocytes the meiotic spindle does not migrate in contrast to wild-type; rather, it elongates dramatically followed by cortical polarization (J:110272)
• ovarian cysts are found in 5 mutant females but not in wild-type (0/19) or heterozygous animals (0/10); incidence is high (4/7) in females older than 6 months
• cysts are serous, bilateral, multilocular in older mice and sometimes infiltrated with blood; smaller cysts are predominantly composed of epithelial tissue, while larger cysts (2/5) contain tissue types typical of a teratoma
• females but not males have reduced fertility
• females have litters with average size of 2 pups, compared to wild-type and heterozygous females which have ~7 pups/litter

cellular
• eggs isolated 18 hours after human chorionic gonadotropin treatment display 2 polar bodies and no pronuclei while egg from wild-type littermates have only one polar body
• eggs failed to arrest during meiosis, leading to spontaneous parthenogenetic activation (progress through meiosis II, germinal vesicle breakdown, extrusion of polar bodies, and cleavage)
• eggs isolated 18 hours after human chorionic gonadotropin treatment display 2 polar bodies and no pronuclei while egg from wild-type littermates have only one polar body (J:19118)
• ~40% of mutant eggs maintained in culture develop a pronucleus indicating parthenogenetic development; 30% of these cleave into 2 nucleated cells and occasionally to 4 cells (J:19118)
• mutant eggs that fail to cleave undergo cytoplasmic fragmentation which is not seen in wild-type eggs (J:19118)
• in Mos-deficient oocytes the meiotic spindle does not migrate in contrast to wild-type; rather, it elongates dramatically followed by cortical polarization (J:110272)

growth/size/body
• ovarian cysts are found in 5 mutant females but not in wild-type (0/19) or heterozygous animals (0/10); incidence is high (4/7) in females older than 6 months
• cysts are serous, bilateral, multilocular in older mice and sometimes infiltrated with blood; smaller cysts are predominantly composed of epithelial tissue, while larger cysts (2/5) contain tissue types typical of a teratoma





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
11/12/2024
MGI 6.24
The Jackson Laboratory