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• W2034379258 abstract "The JAK2 V617F mutation in exon 14 is the most common mutation in chronic myeloproliferative neoplasms (MPNs); deletion of the entire exon 14 is rarely detected. In our previous study of >10,000 samples from patients with suspected MPNs tested for JAK2 mutations by reverse transcription-PCR (RT-PCR) with direct sequencing, complete deletion of exon 14 (Deltaexon14) constituted <1% of JAK2 mutations. This appears to be an alternative splicing mutation, not detectable with DNA-based testing.We investigated the possibility that MPN patients may express the JAK2 Deltaexon14 at low levels (<15% of total transcript) not routinely detectable by RT-PCR with direct sequencing. Using a sensitive RT-PCR-based fluorescent fragment analysis method to quantify JAK2 Deltaexon14 mRNA expression relative to wild-type, we tested 61 patients with confirmed MPNs, 183 with suspected MPNs (93 V617F-positive, 90 V617F-negative), and 46 healthy control subjects. The Deltaexon14 variant was detected in 9 of the 61 (15%) confirmed MPN patients, accounting for 3.96% to 33.85% (mean = 12.04%) of total JAK2 transcript. This variant was also detected in 51 of the 183 patients with suspected MPNs (27%), including 20 of the 93 (22%) with V617F (mean [range] expression = 5.41% [2.13%-26.22%]) and 31 of the 90 (34%) without V617F (mean [range] expression = 3.88% [2.08%-12.22%]). Immunoprecipitation studies demonstrated that patients expressing Deltaexon14 mRNA expressed a corresponding truncated JAK2 protein. The Deltaexon14 variant was not detected in the 46 control subjects.These data suggest that expression of the JAK2 Deltaexon14 splice variant, leading to a truncated JAK2 protein, is common in patients with MPNs. This alternatively spliced transcript appears to be more frequent in MPN patients without V617F mutation, in whom it might contribute to leukemogenesis. This mutation is missed if DNA rather than RNA is used for testing." @default.
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• W2034379258 date "2010-08-13" @default.
• W2034379258 modified "2023-10-18" @default.
• W2034379258 title "JAK2 Exon 14 Deletion in Patients with Chronic Myeloproliferative Neoplasms" @default.
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• W2034379258 doi "https://doi.org/10.1371/journal.pone.0012165" @default.
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