Genetic variation in sympatric Ascaris populations from humans and pigs in China

Weidong Peng, T. J.C. Anderson, Xianmin Zhou, M. W. Kennedy

    Research output: Contribution to journalArticle

    62 Scopus citations

    Abstract

    It has recently been shown using genetic markers that Ascaris in humans and pigs in Central America comprise reproductively isolated populations. We present a similar analysis for a region of China in which close association between pigs and humans has been the norm for thousands of years, and agricultural practices will result in frequent exposure to eggs from both sources. DNA fragments from selected regions of mitochondrial and ribosomal DNA were amplified by PCR and allelic forms identified following digestion with a panel of restriction enzymes, using DNA from a total of 115 individual worms from both people and pigs from 2 neighbouring villages. Significant frequency differences in both mtDNA haplotypes and the rDNA spacer were found between the 2 host-associated populations, indicating that they represented reproductively isolated populations. Mitochondrial haplotype frequencies were different from those observed in Guatemala and also from other Asian Ascaris populations, suggesting low levels of gene flow between populations. However, we found no evidence for significant heterogeneity in the genetic composition of Ascaris infrapopulations in either humans or pigs, possibly indicative of agricultural practices in China which have resulted in a random distribution of alleles within the parasite populations.

    Original languageEnglish (US)
    Pages (from-to)355-361
    Number of pages7
    JournalParasitology
    Volume117
    Issue number4
    DOIs
    StatePublished - Nov 2 1998

    Keywords

    • Ascaris lumbricoides
    • Ascaris suum
    • China
    • Mitochondrial DNA
    • Ribosomal DNA

    ASJC Scopus subject areas

    • Parasitology
    • Animal Science and Zoology
    • Infectious Diseases

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