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Spontaneous Allele Detail
Symbol: Pou1f1dw
Name: POU domain, class 1, transcription factor 1; dwarf
MGI ID: MGI:1856024
Synonyms: dw, dwarf, Pit1dw, Pit1dwSn, Snell-Bagg pituitary dwarf, Snell's dwarf
Gene: Pou1f1  Location: Chr16:65520511-65535005 bp, + strand  Genetic Position: Chr16, 37.25 cM

Show the 1 phenotype image(s) involving this allele.

Strain of Origin:  STOCK Pmelsi
Allele Type:    Spontaneous
Mutation:    Single point mutation
Mutation detailsA G-to-T transversion mutation in codon 261 is predicted to convert a tryptophan residue in the homeodomain to a cysteine in the encoded protein. (J:10774, J:10998)
Inheritance:    Recessive
View phenotypes and curated references for all genotypes (concatenated display).
In Mice Carrying this Mutation: 26 assay results
In Structures Affected by this Mutation: 9 anatomical structures
Find Mice (IMSR)
Mouse strains and cell lines available from the International Mouse Strain Resource (IMSR)
Carrying this Mutation:  Mouse Strains: 2 strains available      Cell Lines: 0 lines available
Carrying any Pou1f1 Mutation:  7 strains or lines available
Phenotypic Similarity to Human Syndrome: Secondary Hypothyroidism J:144823

This mutation arose in a stock of silver mice obtained from an English fancier (J:13120). Homozygous mutant mice are about one-fourth to one-third normal size and are sterile. The small size is due to a defective anterior pituitary in which there is a great deficiency of GH-producing, PRL-producing, and TSH-producing cells (J:6754, J:7211, J:12161). The anterior pituitary of the Pit1dw homozygote is already abnormal at birth with no identifiable GH or PRL cells (J:6684). GH and PRL synthesis is not detectable at any stages from birth to 6 weeks of age (J:6589), and there is probably also a deficiency of TSH and corticotropin (J:19241). Adult dwarf mouse pituitaries retain an embryonic, incompletely differentiated form of corticotrophs (J:13323). The defects in growth and fertility may be corrected by pituitary implants (J:13139) or by administration of pituitary hormones (J:30695, J:5085).

Two populations of cells give rise to thyrotrophs in the anterior pituitary in developing mouse embryos. The first population arises at day 12 in the rostral tip of the gland. This population is independent of Pit1, as it appears in Pit1dw mice, but it disappears by birth. The second population, which arises in the caudomedial portion of the gland at embryonic day 15.5, is Pit1-dependent, and is absent in Snell dwarf mice(J:17223).

Pit1dw mice have been reported to have a defective immune response that primarily affects the T cell system (J:19990), but other authors (J:6241, J:5638) have been unable to confirm these findings and attribute the previous results to secondary effects of dwarfing on overall vigor and nutritional status. Cross (J:2020) has shown that Pit1dw homozygous mice do develop normal immunocompetence, but that this development is delayed relative to that in normal littermates. Dwarf homozygotes have a severe deficiency of dopamine in the median eminence (J:6652).

Original:  J:13120 Snell GD, DWARF, A NEW MENDELIAN RECESSIVE CHARACTER OF THE HOUSE MOUSE. Proc Natl Acad Sci U S A. 1929 Sep 15;15(9):733-4
All:  94 reference(s)

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)
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