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Blood, 15 December 2008, Vol. 112, No. 13, pp. 5111-5121. Prepublished online as a Blood First Edition Paper on September 24, 2008; DOI 10.1182/blood-2008-02-141770.
Submitted February 28, 2008
Department of Oncology, University of Alberta and Cross Cancer Institute, Edmonton, AB, Canada * Corresponding author; email: lpilarsk{at}ualberta.ca.
To characterize genetic contributions towards aberrant splicing of the hyaluronan synthase 1 (HAS1) gene in multiple myeloma (MM) and Waldenstrom's macroglobulinemia (WM), we sequenced 3616 bp in HAS1 exons and introns involved in aberrant splicing, from 17 patients. We identified a total of 197 HAS1 genetic variations (GVs), a range of 3-24 GVs/patient, including 87 somatic GVs acquired in splicing regions of HAS1. Nearly all newly identified inherited and somatic GVs in MM and/or WM were absent from B-CLL, non-malignant disease and healthy donors. Somatic HAS1 GVs recurred in all hematopoietic cells tested, including normal CD34+ hematopoietic progenitor cells and T cells, or as tumor-specific GVs restricted to malignant B and plasma cells. An in vitro splicing assay confirmed that HAS1 GVs direct aberrant HAS1 intronic splicing. Recurrent somatic GVs may be enriched by strong mutational selection leading to MM and/or WM.
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