Jan 2009 Leukemia

Genome profiling of acute myelomonocytic leukemia: alteration of the MYB locus in MYST3-linked cases.

Auteurs

Murati A, Gervais C, Carbuccia N, Finetti P, Cervera N, Adélaïde J, Struski S, Lippert E, Mugneret F, Tigaud I, Penther D, Bastard C, Poppe B, Speleman F, Baranger L, Luquet I, Cornillet-Lefebvre P, Nadal N, Nguyen-Khac F, Pérot C, Olschwang S, Bertucci F, Chaffanet M, Lessard M, Mozziconacci MJ, Birnbaum D

Résumé

The t(8;16)(p11;p13) is a rare translocation involved in de novo and therapy-related myelomonocytic and monocytic acute leukemia. It fuses two genes encoding histone acetyltransferases (HATs), MYST3 located at 8p11 to CREBBP located at 16p13. Variant translocations involve other HAT-encoding genes such as EP300, MYST4, NCOA2 or NCOA3. MYST3-linked acute myeloid leukemias (AMLs) share specific clinical and biological features and a poor prognosis. Because of its rarity, the molecular biology of MYST3-linked AMLs remains poorly understood. We have established the genome and gene expression profiles of a multicentric series of 61 M4/M5 AMLs including 18 MYST3-linked AMLs by using array comparative genome hybridization (aCGH) (n=52) and DNA microarrays (n=44), respectively. We show that M4/5 AMLs have a variety of rare genomic alterations. One alteration, a gain of the MYB locus, was found recurrently and only in the MYST3-linked AMLs (7/18 vs 0/34). MYST3-AMLs have also a specific a gene expression profile, which includes overexpression of MYB, CD4 and HOXA genes. These features, reminiscent of T-cell acute lymphoid leukemia (ALL), suggest the targeting of a common T-myeloid progenitor.

Lire l‘article