Mice homozygous mice for the waved 2 spontaneous mutation (Egfrwa2) are recognizable at 2 to 3 days by curly whiskers. The first coat is waved but later coats are not; vibrissae usually remain curled and the guard hairs curved. Some homozygotes have eyelids open at birth. Fertile mutant females have impaired lactation.
In 1933, or shortly thereafter, the waved 2 mutation arose spontaneously in the "abnormal Corpus callosum stock" held by Dr. Clyde Keeler at The Bussey Institute of Harvard Medical School. In 1935 waved 2 (Egfrwa2) was received from Dr. Reed by Dr. G.D. Snell at the Jackson Laboratory. It was crossed to shaker 2 (Myo15sh2) mice of Dr. C.C. Little at The Jackson Laboratory and waved 2 shaker 2 (Egfrwa2 Myo15sh2) mice were crossed to flexed-tail (f) mice received from the Bussey Institute in 1936. All three mutations were maintained in this stock. In 1947 this stock was returned after the fire to Dr. Snell from Dr. Walter Heston. The stock was maintained by non-sibling within-stock matings until 1960 when one outcross was made to C3H/HeJ. The stock was then sibling mated for 13 generations before 3 crosses were made to C57BL/6J, via backcross-intercross, and the stock was then non-sibling within-stock mated and in 1969 two lines were selected, Myo15sh2 and Egfrwa2 and flexed was dropped from these lines. In the Egfrwa2 line a cross was made to B6.Cg-bc, a congenic strain then at N5, and the resulting stock, carrying a and Egfrwa2 but not bc, was sibling mated to maintain Egfrwa2 by forced heterozygosis. It was cryopreserved in 1986 with the common parent at F53.
|Gene Symbol and Name||a, nonagouti|
|Strain of Origin||old mutant of the mouse fancy|
|General Note||Insertion of the LV30 retrotransposon without the beta4 retrovirus sequence does not cause the nonagouti phenotype. J:278039|
|Molecular Note||Characterization of this allele shows an insertion of DNA comprised of a 5.5kb virus-like element, VL30, into the first intron of the agouti gene. The VL30 element itself contains an additional 5.5 kb sequence, flanked by 526 bp of direct repeats (beta4 retroviral sequence). The host integration site is the same as for at-2Gso and Aw-38J and includes a duplication of four nucleotides of host DNA and a deletion of 2 bp from the end of each repeat. Northern analysis of mRNA from skin of homozygotes shows a smaller agouti message and levels 8 fold lower than found in wild-type.|
|Allele Name||waved 2|
|Allele Synonym(s)||wa2; wa-2; waved2|
|Gene Symbol and Name||Egfr, epidermal growth factor receptor|
|Strain of Origin||STOCK ac|
|General Note||Found by Keeler in an ``abnormal corpus callosum'' stock at the Bussey Institution. |
|Molecular Note||A T-to-G transversion mutation in the sequences encoding the tyrosine kinase domain results in a substitution of a highly conserved valine with glycine at position 767 (P.V767G) in the third kinase subdomain.|