Journal Article

<i>EPHA7</i>, a new target gene for 6q deletion in T-cell lymphoblastic lymphomas

Pilar López-Nieva, Concepción Vaquero, Pablo Fernández-Navarro, Laura González-Sánchez, María Villa-Morales, Javier Santos, Manel Esteller and José Fernández-Piqueras

in Carcinogenesis

Volume 33, issue 2, pages 452-458
Published in print February 2012 | ISSN: 0143-3334
Published online November 2011 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgr271
EPHA7, a new target gene for 6q deletion in T-cell lymphoblastic lymphomas

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Cryptic deletions at chromosome 6q are common cytogenetic abnormalities in T-cell lymphoblastic leukemia/lymphoma (T-LBL), but the target genes have not been formally identified. Our results build on detection of specific chromosomal losses in a mouse model of γ-radiation-induced T-LBLs and provide interesting clues for new putative susceptibility genes in a region orthologous to human 6q15–6q16.3. Among these, Epha7 emerges as a bona fide candidate tumor suppressor gene because it is inactivated in practically all the T-LBLs analyzed (100% in mouse and 95.23% in human). We provide evidence showing that Epha7 downregulation may occur, at least in part, by loss of heterozygosity (19.35% in mouse and 12.5% in human) or promoter hypermethylation (51.61% in mouse and 43.75% in human) or a combination of both mechanisms (12.90% in mouse and 6.25% in human). These results indicate that EPHA7 might be considered a new tumor suppressor gene for 6q deletions in T-LBLs. Notably, this gene is located in 6q16.1 proximal to GRIK2 and CASP8AP2, other candidate genes identified in this region. Thus, del6q seems to be a complex region where inactivation of multiple genes may cooperatively contribute to the onset of T-cell lymphomas.

Journal Article.  4105 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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