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COMMENT
JOURNAL ARTICLE
Sézary Syndrome: Translating Genetic Diversity into Personalized Medicine.
Journal of Investigative Dermatology 2016 July
Sézary syndrome is probably the most studied cutaneous T-cell lymphoma subtype. Beyond the consensus criteria for Sézary syndrome diagnosis, Sézary cells display heterogeneous phenotypes and differentiation profiles. In the face of SS diversity, the great hope is to develop targeted therapies based on next-generation sequencing to define the genetic landscape of Sézary syndrome. Prasad et al. report on the use of exome sequencing and RNA sequencing to study selected CD4(+) blood cells from 15 patients with erythroderma Sézary syndrome, 14 of whom fulfilled the conventional criteria for diagnosis. The most common genetic abnormality, TP53 gene deletion on chromosome arm 17p and/or mutation, was observed in 58% of patients. However, mutations affecting PLCG1, STAT5B, GLI3, and CARD11 each were detected in only one individual. Nevertheless, Prasad et al. report single point mutations or copy number alterations in several new genes and in new fusion genes, with predicted biological relevance. This information underscores the diversity of genetic alterations and of the mechanisms of alterations of single genes. At the individual level, Sézary cells may combine alterations of genes involved in T-cell signaling, NF-kB and JAK-signal transducer and activator of transcription pathways, apoptosis control, chromatin remodeling, and DNA damage response. The therapeutic relevance of these potential targets needs to be evaluated with tests of function.
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