Internal Transcribed Spacer 1 (ITS1) based sequence typing reveals phylogenetically distinct Ascaris population.


:Taxonomic differentiation among morphologically identical Ascaris species is a debatable scientific issue in the context of Ascariasis epidemiology. To explain the disease epidemiology and also the taxonomic position of different Ascaris species, genome information of infecting strains from endemic areas throughout the world is certainly crucial. Ascaris population from human has been genetically characterized based on the widely used genetic marker, internal transcribed spacer1 (ITS1). Along with previously reported and prevalent genotype G1, 8 new sequence variants of ITS1 have been identified. Genotype G1 was significantly present among female patients aged between 10 to 15 years. Intragenic linkage disequilibrium (LD) analysis at target locus within our study population has identified an incomplete LD value with potential recombination events. A separate cluster of Indian isolates with high bootstrap value indicate their distinct phylogenetic position in comparison to the global Ascaris population. Genetic shuffling through recombination could be a possible reason for high population diversity and frequent emergence of new sequence variants, identified in present and other previous studies. This study explores the genetic organization of Indian Ascaris population for the first time which certainly includes some fundamental information on the molecular epidemiology of Ascariasis.


Das K,Chowdhury P,Ganguly S




Has Abstract


2015-09-04 00:00:00










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