A leucine aminopeptidase gene of the pacific oyster Crassostrea gigas exhibits an unusually high level of sequence variation, predicted to affect structure, and hence activity, of the enzyme

Susan D. Wharam, Trevor J. Wardill, Victoria Goddard, Kirsten M. Donald, Helen Parry, Philip Pascoe, Paul Pickerill, Gary Smerdon, Anthony J.S. Hawkins

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Leucine aminopeptidase (LAP) belongs to a family of ubiquitous peptidases, with roles in growth and development, stress responses and adaptation to changing environmental conditions. The LAP gene was sequenced from a commercially important marine bivalve: the Pacific oyster Crassostrea gigas, and sequence polymorphisms were identified. This study identified 21 single nucleotide polymorphisms (SNPs), which would alter the encoded amino acid sequence, one 3 base deletion, one single base deletion, which would create a truncated protein (predicted to be nonfunctional), and a further 50 silent SNPs. The 23 polymorphisms altering protein sequence were found to occur in 34 different combinations, which we designated as 34 alleles: many more than the 6 alleles predicted previously by allozyme analysis. Predictions of protein structure and stability were used to identify which of the changes in the protein sequence are most likely to affect enzyme function. The sequence of the LAP gene noncoding regions was also analyzed and simple sequence repeats (microsatellites) were found in introns 1 and 9. The intron 1 microsatellite region was also found in another species of oyster: Crassostrea hongkongensis. We have demonstrated that the LAP gene region of the Pacific oyster, C. gigas is highly variable, and have identified new, potentially useful, genetic markers.

Original languageEnglish (US)
Pages (from-to)1143-1154
Number of pages12
JournalJournal of Shellfish Research
Volume27
Issue number5
DOIs
StatePublished - Dec 2008
Externally publishedYes

Keywords

  • Crassostrea gigas
  • Genetic markers
  • Leucine aminopeptidase
  • Pacific oyster
  • Protein structure
  • Simple sequence repeats (microsatellites)
  • Single nucleotide polymorphisms

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