A complex and cryptic intrachromosomal rearrangement generating the fip1l1-pdgfra fusion gene in adult acute myeloid leukemia

Publication date: Available online 21 August 2019Source: Cancer GeneticsAuthor(s): Nicoletta Coccaro, Luisa Anelli, Paola Orsini, Antonella Zagaria, Angela Minervini, Luciana Impera, Giuseppina Tota, Crescenzio Francesco Minervini, Cosimo Cumbo, Elisa Parciante, Maria Rosa Coserva, Immacolata Attolico, Giorgina Specchia, Francesco AlbanoAbstractMyeloid neoplasms with eosinophilia and abnormalities of the PDGFRA gene can benefit from therapy with tyrosine kinase inhibitors, therefore revealing the PDGFRA rearrangement is essential to ensure the best choice of treatment. The most common PDGFRA partner is the FIP1L1 gene, generating the oncoprotein FIP1L1/PDGFRA (F/P). In the majority of cases the F/P fusion gene originates from intrachromosomal rearrangement at band 4q12, and occasionally from chromosomal translocations. In both cases, the interstitial chromosomal deletion of a region involving the CHIC2 gene has been reported, which is cryptic by conventional karyotyping but detectable by Fluorescence In Situ Hybridization (FISH) analyses. Herein, we report an acute myeloid leukemia (AML) case presenting with eosinophilia; the F/P fusion gene originated from a new, cryptic and complex intrachromosomal rearrangement of 4q12. Classical FISH assay revealed abnormal hybridization signals, but the presence of the F/P chimaeric gene was demonstrated by molecular analysis. We performed molecular characterization of the chromosomal rearrangement and targeted Next-Generation Sequencing...
Source: Cancer Genetics - Category: Cancer & Oncology Source Type: research