BMC Microbiology (Sep 2011)

Clonal diversity of the glutamate dehydrogenase gene in <it>Giardia duodenalis </it>from Thai Isolates: evidence of genetic exchange or Mixed Infections?

  • Saksirisampant Wilai,
  • Boontanom Parima,
  • Thompson RC Andrew,
  • Mungthin Mathirut,
  • Leelayoova Saovanee,
  • Siripattanapipong Suradej,
  • Tan-ariya Peerapan

DOI
https://doi.org/10.1186/1471-2180-11-206
Journal volume & issue
Vol. 11, no. 1
p. 206

Abstract

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Abstract Background The glutamate dehydrogenase gene (gdh) is one of the most popular and useful genetic markers for the genotypic analysis of Giardia duodenalis (syn. G. lamblia, G. intestinalis), the protozoan that widely causes enteric disease in humans. To determine the distribution of genotypes of G. duodenalis in Thai populations and to investigate the extent of sequence variation at this locus, 42 fecal samples were collected from 3 regions of Thailand i.e., Central, Northern, and Eastern regions. All specimens were analyzed using PCR-based genotyping and recombinant subcloning methods. Results The results showed that the prevalence of assemblages A and B among these populations was approximately equal, 20 (47.6%) and 22 (52.4%), respectively. Sequence analysis revealed that the nucleotide diversity of assemblage B was significantly greater than that in assemblage A. Among all assemblage B positive specimens, the allelic sequence divergence within isolates was detected. Nine isolates showed mixed alleles, ranged from three to nine distinct alleles per isolate. Statistical analysis demonstrated the occurrence of genetic recombination within subassemblages BIII and BIV was likely. Conclusion This study supports increasing evidence that G. duodenalis has the potential for genetic exchange.

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