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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





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last database update
10/29/2024
MGI 6.24
The Jackson Laboratory