Caracul (Krt2-6gCa), keratin complex 2, basic, gene 6g, Chr. 15, 63.2 cM, Genome Coordinates: 102213867-102223026
Alleles of the caracul mutation arose spontaneously in the 1930s and many more have been identified subsequently. This semidominant mutation was mapped to Chromosome 15 and ultimately determined to be due to mutations in the keratin complex 2, basic, gene 6g. Mutant mice have curved vibrissae that grow in different directions in contrast to those of normal mice that are long, straight and grow in parallel to each other. As vibrissae are evident around the time of birth, this feature can be used to identify mutant mice as early as one day of age. The pelage hairs also have a wavy pattern. Variations occur in the different allelic mutations.
Limited histologic studies did not identify any structural abnormalities. Examination of plucked hairs revealed all hair types were present but each hair type varied in thickness along the length of the fibers and the fibers had multiple small bends unlike normal mouse hairs that were relatively uniform in thickness and straight except for specific areas that bend associated with specific hair types.
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