Mouse silver mutation is caused by a single base insertion in the putative cytoplasmic domain of Pmel 17


This laboratory has established in previous studies that Pmel 17, a gene expressed specifically in melanocytes, maps near the silver coat color locus (si/si) on mouse chromosome 10. In the current study, we have focused on determining whether or not the si allele carries a mutation in Pmel 17. Pmel 17 cDNA clones, isolated from wild-type and si/si murine melanocyte cDNA libraries, were sequenced and compared. A single nucleotide (A) insertion was found in the putative cytoplasmic tail of the si/si Pmel 17 cDNA clone. This insertion is predicted to alter the last 24 amino acids at the C-terminus. Also predicted is the extension of the Pmel 17 protein by 12 residues because a new termination signal created downstream from the wild-type reading frame. The mutation was confirmed by the sequence of the PCR-amplified genomic region flanking and including the mutation site. The fact that si/si Pmel 17 was not recognized by antibodies directed toward the C-terminal 15 amino acids of wild-type Pmel 17, indicated a defect in this region. We conclude from these results that silver pmel 17 protein has a major defect at the carboxyl terminus. The chromosomal location and the identification of a potentially pathologic mutation in si-Pmel 17 support our conclusion that Pmel 17 is encoded at the silver locus.

DOI: 10.1093/nar/23.1.154
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@article{Kwon1995MouseSM, title={Mouse silver mutation is caused by a single base insertion in the putative cytoplasmic domain of Pmel 17}, author={Byoung S. Kwon and Ruth Halaban and Selvarangan Ponnazhagan and Kack Kim and Chaya Chintamaneni and Dorothy Bennett and Richard T. Pickard}, journal={Nucleic acids research}, year={1995}, volume={23 1}, pages={154-8} }