Human Genetics

, Volume 89, Issue 2, pp 213–222

Variation in gene copy number and polymorphism of the human salivary amylase isoenzyme system in Caucasians

Authors

  • Ruud A. Bank
    • Institute of Human Genetics, Medical Faculty, Vrije Universiteit
  • Ewald H. Hettema
    • Institute of Human Genetics, Medical Faculty, Vrije Universiteit
  • Marian A. Muijs
    • Institute of Human Genetics, Medical Faculty, Vrije Universiteit
  • Gerard Pals
    • Institute of Human Genetics, Medical Faculty, Vrije Universiteit
  • Fré Arwert
    • Institute of Human Genetics, Medical Faculty, Vrije Universiteit
  • Dorret I. Boomsma
    • Department of PsychonomicsVrije Universiteit
  • Jan C. Pronk
    • Institute of Human Genetics, Medical Faculty, Vrije Universiteit
Original Investigations

DOI: 10.1007/BF00217126

Cite this article as:
Bank, R.A., Hettema, E.H., Muijs, M.A. et al. Hum Genet (1992) 89: 213. doi:10.1007/BF00217126
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Summary

The polymorphic patterns of human salivary amylase of a large number of individuals of Caucasian origin were determined by using isoelectric focusing and polyacrylamide gel electrophoresis. Nine different salivary amylase protein variants were found; three of them are recorded for the first time and their heredity is shown. Some of the variants are encoded by haplotypes expressing three allozymes. Most variants display low frequencies. Analysis of the relative intensities of variant-specific isozyme bands, combined with segregation analysis, show that extensive quantitative variation is present in the population. The numbers of salivary amylase genes in some families showing quantitative variation at the protein level have been estimated by the polymerase chain reaction. We present evidence that quantitative variations in amylase protein patterns do not always reflect variations in gene copy number but that other mechanisms are also involved.

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Copyright information

© Springer-Verlag 1992