Abstract
An assay modeled on a known polymorphism in the PE_PGRS9 gene of Mycobacterium tuberculosis was designed to assess the mutability of a sequence containing interspersed PGRS repeats. Application of the assay in Mycobacterium smegmatis revealed sequence plasticity: in addition to recapitulating the mutation on which it was based, other mutations likely mediated by replication slippage between PGRS repeats were detected. However, the mutation rates argued against marked hypermutability of such sequences in mycobacteria.
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