bcr-abl阴性骨髓增生性疾病患者JAK2V617F点突变检测的临床意义

目的 探索Janus Kinase 2V617F基因突变(JAK2V617F)在bcr-abl阴性骨髓增生性疾病(MPD)的发生率和临床意义.方法 基因组DNA从患者骨髓或外周血粒细胞中提取.采用等位基因特异性PCR(AS-PCR)、限制性内切酶消化和PCR产物测序的方法检测JAK2V617F突变.共检测患者110例,其中bcr-abl阴性MPD 41例、bcr-abl阳性慢性粒细胞白血病(CML)25例和急性白血病44例.结果 JAK2V617F阳性结果分别为真性红细胞增多症(PV)11例(91.7%)、原发性血小板增多症(ET)8例(53.3%)、特发性骨髓纤维化(IMF)4例(57.1%),而高嗜酸粒细胞增多症(HES)7例、bcr-abl阳性CML 25例和急性白血病44例[包括急性髓细胞白血病(AML)24例、急性淋巴细胞白血病(ALL)18例、急性混合细胞白血病2例1均未检测到JAK2V617F基因突变.在所有JAK2V617F阳性的标本和10份阴性标本中,AS-PCR和限制性内切酶消化方法的测定结果都可经测序进一步证实.结论 90%以上的PV、50%以上的ET和IMF可检测到JAK2V617F基因突变;JAK2V617F基因突变在PV、ET和IMF的诊断和鉴别诊断中有重要意义,可以作为诊断的分子标志,也可能是治疗的新靶点.

Evaluating and detection of JAK2V617F point mutation in bcr-abl-negative myeloproliferative disorders

Objective To study the Janus Kinase 2 V617F (JAK2V617F) point mutation in bcr-abl-negative myeloproliferative disorders (MPD) and explore its clinical significances. Methods Genomic DNA was isolated from bone marrow or peripheral-blood granulocytes. Allelespecific-polymerase chain reactions (AS-PCR), restriction enzyme digestion in combination with PCR product sequencing were performed to detect the mutation in genomic DNA. 110 patients were detected, including 41 with bcr-ablnegative MPD, 25 with bcr-abl-positive chronic myelogenous leukemia (CML), and 44 with acute leukemia.Results JAK2V617F was presented in 11 cases(91.7 %) of 12 polycythemia vera (PV), 8 cases(53.3 %) of 15 essential thrombocythemia(ET), 4 cases (57.1%) of 7 idiopathic myelofibrosis (IMF), while in other patients including 7 hypereosinophilic syndrome (HES), 25 bcr-abl-positive CML, 24 acute myelocytic leukemia (AML), 18 acute lymphoblastic leukemia(ALL), and 2 acute mixed lineage leukemia, JAK2V617F can not be detected. All positive samples and 10 negative samples identified by AS-PCR and restriction enzyme digestion were confirmed further by DNA sequencing. Conclusion The frequency of JAK2V617F mutation was more than 90 % among patients with PV, more than 50 % among patients with ET and IMF. The detection of JAK2V617F mutation will be of great significanees in the diagnosis and differential diagnosis of MPD. This mutation can be a molecular marker of MPD and might be a treatment target in the future.