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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Pes1tm1Sad
targeted mutation 1, Stephen A Duncan
MGI:2445464
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Pes1tm1Sad/Pes1tm1Sad involves: 129S1/Sv * 129X1/SvJ MGI:2677137


Genotype
MGI:2677137
hm1
Allelic
Composition
Pes1tm1Sad/Pes1tm1Sad
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Pes1tm1Sad mutation (0 available); any Pes1 mutation (38 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• blastomeres in homozygous null embryos arrested at preimplantation (morula) stages of development
• morulae were recovered at non-Mendelian frequencies: approximately 50% of homozygous null embryos arrested at an even earlier developmental stage

embryo
N
• overall, homozygous null morulae appeared similar to wild-type embryos with evenly sized blastomeres and well-defined cell-cell borders
• mutant blastomeres failed to proliferate past morula stages of development, and appeared disorganized and unevenly sized
• at 3.5 dpc, electron microscopy revealed that blastomeres of homozygous null embryos failed to form well-differentiated nucleoli, although electron dense material (presumably remnants of the nucleolus precursor body) and electron dense spheres located near the nuclear periphery were readily identifiable
• high magnification revealed the presence of ribosomes in control embryos but not in homozygous null embryos: mutant embryos displayed a striking 23-fold reduction in the number of ribosomes relative to wild-type
• all homozygous null embryos examined at 3.5 dpc contained only 8-16 cells (i.e. the number of cells normally observed in wild-type morulae at 2.5 dpc), and none of the homozygous null embryos had formed blastocysts





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last database update
10/22/2024
MGI 6.24
The Jackson Laboratory