Thursday, May 18, 2017

TB Study Finds Some Previously Reported Virulence Variants Were Sequencing Errors

A publication in BMC Genomics upends some of the conventional wisdom about variants that may cause virulence in Mycobacterium tuberculosis. Scientists at San Diego State University used SMRT Sequencing to produce a complete assembly of the pathogen, finding that earlier assemblies encountered problems due to GC bias and repetitive DNA. “SMRT genome assembly corrects reference errors, resolving the genetic basis of virulence in Mycobacterium tuberculosis” comes from Afif Elghraoui, Samuel Modlin, and Faramarz Valafar. The team used long-read PacBio sequencing on an attenuated strain of M. tuberculosis, which is often compared to a virulent strain to highlight sources of pathogenicity. The same strain was…

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