Phylogenetic analysis of the complete genome of 11 BKV isolates obtained from allogenic stem cell transplant recipients in Ireland

Journal of Medical Virology
R J DrewBrendan Crowley

Abstract

BK polyomavirus (family Polyomaviridae) may cause hemorrhagic cystitis (BKV-HC) in hematopoietic stem cell transplant recipients. Eleven complete BKV genomes (GenBank accession numbers: JN192431-JN192441) were sequenced from urine samples of allogenic hematopoietic stem cell transplant recipients and compared to complete BKV genomes in the published literature. Of the 11 isolates, seven (64%) were subgroup Ib-1, three (27%) isolates belonged to subgroup Ib-2 and a single isolate belonged to subtype III. The analysis of single-nucleotide polymorphisms in this study showed that isolates could be subclassified into subtypes I-IV and subgroups Ib-1 and Ib-2 on the basis of VP1 of the first part of the Large T-antigen (LTag). The non-coding control region (NCCR) of the 11 isolates was also sequenced. These sequences showed that there was consistent sequence homology within subgroups Ib-1 and Ib-2. Two new mutations were described in the isolates, G→C at O(84) in isolate SJH-LG-310, and a deletion at R(2-7) in isolate SJH-LG-309. No known transcription factor is thought to be present at the site of either of these mutations. There were no rearrangements seen in isolates and this may be because the patients were not followed up over t...Continue Reading

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