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The matrix (M) genes of Yamagata-1 strain subacute sclerosing panencephalitis virus passaged in African green monkey kidney cells and human neuroblastoma cells displayed strikingly nonrandom sequence divergence. The genes of both substrains shared a large number of uridine (U) to cytidine (C) transitions, but the latter contained numerous additional U to C changes in a localized region. Over 90% of the additional mutations were identical to the hypermutated nucleotides in the M gene found in a measles inclusion body encephalitis case. The nonrandom nature, the apparent host dependency, and the abrupt boundaries of these mutations suggest that these mutations might be caused by an extrinsic biased mutational activity rather than intrinsic polymerase errors. This mutational activity might account for the extraordinarily high C to U ratios in the non-protein-coding regions of both the M and fusion genes of wild-type measles virus.

Generalized and localized biased hypermutation affecting the matrix gene of a measles virus strain that causes subacute sclerosing panencephalitis