Abstract
Objective To identify genotypes of Oesophagostmum venulosum (O. venulosum) prevailing in West Bengal, India by comparing variation of nucleotide sequences among 28S rRNA. Methods PCR amplification of partial segment of 28 S rRNA sequence and analysis of sequence amplified product by single strand conformation polymorphism (SSCP). Results Two distinct conformers among male and female parasites were identified by PCR-SSCP analysis. Sequence analysis among conformers revealed the presence of five single nucleotide polymorphisms (SNP) in codon 64, 66, 86, 125 and 146. Secondary RNA prediction structure showed that out of 5 SNPs, 4 occurred at interior loop of RNA which confirmed evolutionary changes among isolates prevailing in this region. Conclusions SNPs occured in different isolates of O. venulosum might influence critical changes in rRNA folding pattern which influence evolutionary changes among isolates.
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