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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Bltp2em1(IMPC)J
endonuclease-mediated mutation 1, Jackson
MGI:6203636
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Bltp2em1(IMPC)J/Bltp2em1(IMPC)J C57BL/6NJ-Bltp2em1(IMPC)J/Mmjax MGI:6394231
ht2
Bltp2em1(IMPC)J/Bltp2+ C57BL/6NJ-Bltp2em1(IMPC)J/Mmjax MGI:6461022


Genotype
MGI:6394231
hm1
Allelic
Composition
Bltp2em1(IMPC)J/Bltp2em1(IMPC)J
Genetic
Background
C57BL/6NJ-Bltp2em1(IMPC)J/Mmjax
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Bltp2em1(IMPC)J mutation (2 available); any Bltp2 mutation (79 available)
Data Sources
phenotype observed in females
phenotype observed in males
N normal phenotype

Bltp2em1(IMPC)J/Bltp2em1(IMPC)J embryos alive at E10.5 exhibit heart defects and some have abnormal head shape and blood pooling. All mutants recovered at E11.5 are smaller and most are abnormal although a few appear normal.

cardiovascular system
• at E10.5, most homozygous embryos that are alive exhibit heart defects
• at E10.5, some homozygous embryos exhibit abnormal blood pooling

craniofacial
• at E10.5, half of the homozygous embryos exhibit an abnormal head shape

embryo
• by E11.5, most homozygous embryos are abnormal
• however, germ layer development is normal at E9.5 and, surprisingly, a few embryos are still normal in appearance at E11.5
• at E9.5, homozygous embryos are generally smaller but indistinguishable from control littermates
• at E10.5 and E11.5, all recovered homozygous embryos are smaller than controls
• at E10.5, placentas exhibit moderate labyrinth zone defects with incomplete penetrance; severity of labyrinth zone defects correlates with that of the embryonic phenotype
• one of 4 placentas show normal labyrinth zone development at E10.5
• at E10.5, two of 4 placentas exhibit a markedly reduced Tfeb+ labyrinth trophoblast layer
• at E10.5, all (4 of 4) placentas show a consistently reduced Tpbpa+ spongiotrophoblast layer
• at E10.5, three of 4 placentas show impaired chorioallantoic branching, as indicated by reduced Gcm1 expression
• however, placentas are properly developed at E9.5

growth/size/body
• at E10.5, half of the homozygous embryos exhibit an abnormal head shape
• at E9.5, homozygous embryos are generally smaller but indistinguishable from control littermates
• at E10.5 and E11.5, all recovered homozygous embryos are smaller than controls

mortality/aging
• approximately 1/3 of homozygous embryos recovered at E10.5 are dying or resorbed while those that are still alive display a range of defects; two homozygous embryos recovered at E12.5 are dying/undergoing resorption




Genotype
MGI:6461022
ht2
Allelic
Composition
Bltp2em1(IMPC)J/Bltp2+
Genetic
Background
C57BL/6NJ-Bltp2em1(IMPC)J/Mmjax
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Bltp2em1(IMPC)J mutation (2 available); any Bltp2 mutation (79 available)
Data Sources
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological

cardiovascular system

growth/size/body

integument
IMPC - JAX

pigmentation

vision/eye





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Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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last database update
12/09/2025
MGI 6.24
The Jackson Laboratory