The Molecular Basis of brown, an Old Mouse Mutation, and of an Induced Revertant to Wild Type

• Published in: Genetics (Austin) Vol. 126; no. 2; pp. 443 - 449
• Main Authors: Zdarsky, E, Favor, J, Jackson, I. J
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Genetics Soc America 01.10.1990; Genetics Society of America
• Subjects: Amino Acid Sequence; Animals; Base Sequence; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Genes. Genome; Hair Color - genetics; Investigations; Melanocytes - metabolism; Membrane Glycoproteins; Mice; Molecular and cellular biology; Molecular genetics; Molecular Sequence Data; Mutation; Open Reading Frames; Oxidoreductases; Phenotype; Polymerase Chain Reaction; Proteins - genetics; RNA, Messenger - biosynthesis; α-Tyrosinase; Nucleotide sequence; Enzyme; Rodentia; Gene expression; Pigmentation; Polymerase chain reaction; Vertebrata; Reversion; Mammalia; Messenger RNA; Mouse; Analog; DNA; Mutation; Molecular cloning
• ISSN: 0016-6731; 1943-2631; 1943-2631
• DOI: 10.1093/genetics/126.2.443

The murine b locus encodes the tyrosinase related protein, TRP-1, a putative membrane-bound, copper-containing enzyme having about 40% amino acid identity with tyrosinase. The protein is essential for production of black rather than brown hair pigment. We show that skin of mutant brown mice contains the same amount of TRP-1 mRNA as wild type. On sequencing the coding region of the mutant mRNA we find four nucleotide differences from the wild-type (Black) sequence. Two of these differences result in different amino acid residues encoded by the brown allele. By sequencing the TRP-1 gene from a mouse in which a reversion from brown to Black has been induced by ethylnitrosourea we are able to show that only one of these amino acid changes, which substitutes a tyrosine for a conserved cysteine, is the cause of the brown phenotype. This mutation is adjacent to another cysteine at which, in the analogous position in tyrosinase a mutation results in the albino phenotype. The sequence of the revertant is the first report of DNA sequence of an ethylnitrosourea-induced genetic change in mouse.