Biochemical Genetics

, Volume 27, Issue 9–10, pp 571–589 | Cite as

Biochemical characterization of genotypes at the phosphoglucomutase-2 locus in the pacific oyster,Crassostrea gigas

  • Grant H. Pogson


The four most common allozymes at thePgm-2 locus inCrassostrea gigas were purified and characterized over physiological ranges of temperature andpH. Significant differences were observed between genotypes in their apparent Michaelis constants for glucose-1-phosphate and glucose-1,6-diphosphate,Vmax/K m ratios,pH-dependent activities, and temperature stabilities. These functional differences were caused almost exclusively by the divergent properties of thePgm-292 allozyme; limited differentiation existed among thePgm-296,Pgm-2100, andPgm-2104 variants. Heterozygotes displayed strict intermediacy for all kinetic and structural properties examined. The results are discussed in light of their ability to account for the overdominant body weights ofPgm-2 heterozygotes reported by Fujio (1982). It is concluded that overdominance is unlikely to arise at this locus as a consequence of these biochemical differences because of their limited magnitude and incompatibility with allelic frequencies in natural populations.

Key words

phosphoglucomutase allozymes enzyme kinetics heterozygosity Crassostrea gigas 


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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • Grant H. Pogson
    • 1
  1. 1.Department of ZoologyUniversity of British ColumbiaVancouverCanada

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