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Protein and amino acid composition of hair from mice carrying the naked (N) gene

Published online by Cambridge University Press:  14 April 2009

Kathryn A. Raphael ,
R. C. Marshall  and
Pamela R. Pennycuik
Kathryn A. Raphael
Affiliation:
CSIRO, Division of Animal Production, P.O. Box 239, Blacktown, N.S.W., 2148, Australia.
R. C. Marshall
Affiliation:
CSIRO, Division of Protein Chemistry, 343 Royal Parade, Parkville, Victoria, 3052, Australia.
Pamela R. Pennycuik
Affiliation:
CSIRO, Division of Animal Production, P.O. Box 239, Blacktown, N.S.W., 2148, Australia.

Summary

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The protein and amino acid compositions of hair from mice carrying the naked (N) gene were compared with those of wild-type (+ / +) mouse hair using two-dimensional polyacrylamide gel electrophoresis and amino acid analysis. In samples obtained from N /+ mice, the numbers of positions of the low-sulphur (LS), high-sulphur (HS) and high tyrosine (HT) protein spots were indistinguishable from those observed in + / + samples but the amount of HT protein was reduced in N / + hair. In samples obtained from N /N mice the protein spots were fewer than, and perhaps different from, those in samples from the other two genotypes; all protein classes were represented but the HS and HT protein content appeared to be less than that in + / + and N / + hair. Amino acid analyses of hair samples showed that the HS contents of + / + and N / + hair were approximately the same, whereas the HT protein content of N / + hair was about half that in + / + hair. N / N hair contained less half-cystine and tyrosine than + / + and N / + hairs, but because the contents of proline, threonine and glycine were unexpectedly high, it appears that protein components of unusual composition are present in N / N hair. It was concluded that the gene at the N locus is involved only indirectly in the synthesis of the structural proteins found in mouse hair.

Type
Research Article
Information
Genetics Research , Volume 44 , Issue 1 , August 1984 , pp. 29 - 38
Copyright
Copyright © Cambridge University Press 1984

References

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