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Translocations of 14q32 and deletions of 13q14 are common chromosomal abnormalities in systemic amyloidosis (AL)

Lookup NU author(s): Professor Christine Harrison FRCPath FMedSci


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Summary. Systemic monoclonal immunoglobulin light chain amyloidosis (AL) is associated with clonal plasma cell dyscrasias that are often subtle and non-proliferating. AL shares numerical chromosomal changes with multiple myeloma (MM) and monoclonal gammopathy of undetermined significance (MGUS). Illegitimate translocations involving the immunoglobulin heavy chain gene (IGH) at 14q32 and deletions of the long arm of chromosome 13, [del(13q)], commonly occur in MM, MGUS and plasma cell leukaemia. In AL IGH rearrangements have been identified but, to date, there are no reports of del(13q). In this study of 32 patients with AL, 24 with systemic and eight with localized disease, translocations involving IGH and del(13q) were found using dual-colour interphase fluorescence in situ hybridization (FISH). IGH translocations were observed in 11 patients (37% overall and in 46% with systemic disease), of which nine had the IGH/CCND1 fusion from t(11;14)(q13;q32). Two showed IGH translocations other than the t(11;14) or t(4;14)(p16;q32). In one of these patients a breakpoint within the constant region of IGH between Cα1 and Cα2 was indicated. In the second a deletion covering Cα1 and Cα2 accompanied the translocation. Ten patients (27% overall and 33% of those with systemic disease) showed del(13q). The gain or loss of IGH and CCND1 signals provided evidence of numerical chromosomal changes in three patients.

Publication metadata

Author(s): Harrison CJ, Mazzullo H, Ross FM, Cheung KL, Gerrard G, Harewood L, Mehta A, Lachmann HJ, Hawkins PN, Orchard KH

Publication type: Article

Publication status: Published

Journal: British Journal of Haematology

Year: 2002

Volume: 117

Issue: 2

Pages: 427-435

ISSN (print): 0007-1048

ISSN (electronic): 1365-2141

Publisher: Wiley-Blackwell Publishing Ltd.


DOI: 10.1046/j.1365-2141.2002.03438.x


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