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Nucleic Acids Res. Dec 25, 1990; 18(24): 7293–7298.
PMCID: PMC332865

Conserved cysteine to serine mutation in tyrosinase is responsible for the classical albino mutation in laboratory mice.

Abstract

Albinism, due to a lack of melanin pigment, is one of the oldest known mutations in mice. Tyrosinase (monophenol oxygenase, EC 1.14.18.1) is the first enzyme in the pathway for melanin synthesis, and the gene encoding this enzyme has been mapped to the mouse albino (c) locus. We have used mouse tyrosinase cDNA clones and genomic sequencing to study the albino mutation in laboratory mice. Within the tyrosinase gene coding sequences, a G to C transversion at nucleotide 308, causing a cysteine to serine mutation at amino acid 103, is sufficient to abrogate pigment production in transgenic mice. This same base pair change is fully conserved in classical albino strains of laboratory mice. These results indicate that a conserved mutation in the tyrosinase coding sequences is responsible for the classical albino mutation in laboratory mice, and also that most albino laboratory mouse strains have been derived from a common ancestor.

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Selected References

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