Incidence of the JAK2 V617F mutation among patients with splanchnic or cerebral venous thrombosis and without overt chronic myeloproliferative disorders

Background: Thrombosis of splanchnic or cerebral veins is a typical manifestation of polycythemia vera (PV) or essential thrombocythemia (ET). The recently identified Janus kinase 2 (JAK2) V617F somatic mutation is closely related to chronic myeloproliferative disorders (CMD). Objective: To assess the incidence of the JAK2 V617F mutation among patients with splanchnic or cerebral venous thrombosis with or without overt CMD. Patients and methods: We searched for the mutation in 139 adult patients (> 18 years old) with thrombosis of hepatic veins (HVT, n = 15), or extrahepatic portal vein (PVT) and/or mesenteric vein (MVT) (n = 79), or cerebral veins (CVT, n = 45). Only 19 patients fulfilled criteria for diagnosis of PV (n = 8) or ET (n = 11) at the time of thrombosis: four had HVT, 11 PVT and/or MVT, and four CVT. Results: The JAK2 V617F mutation was found in 94.7% [95% CI 75.3-99.0] of the patients with overt CMD at the time of thrombosis, in 21.5% (95% CI 13.8-31.7) of the patients with abdominal venous thrombosis and without overt CMD, and in 4.8% (95% CI 1.3-16.1) of the patients with CVT and without overt CMD. Among the patients without overt CMD or thrombophilia and with unprovoked thrombosis, 29.4% (95% CI 16.8-46.1) with splanchnic venous thrombosis and 42.8% (95% CI 24.4-63.4) with PVT had the JAK2 V617F mutation. Conclusions: A substantial proportion of patients with splanchnic venous thrombosis and a small, but significant, number of patients with CVT can be recognized as carriers of the JAK2 V617F mutation in the absence of overt signs of CMD. The clinical significance of such findings deserves further investigation.     

Uses and abuses of JAK2 and MPL mutation tests in myeloproliferative neoplasms a paper from the 2010 William Beaumont hospital symposium on molecular pathology

JAK2V617F is sufficiently prevalent in BCR-ABL1-negative myeloproliferative neoplasms (MPNs) to be useful as a clonal marker. JAK2V617F mutation screening is indicated for the evaluation of erythrocytosis, thrombocytosis, splanchnic vein thrombosis, and otherwise unexplained BCR-ABL1-negative granulocytosis. However, the mutation does not provide additional value in the presence of unequivocal morphologic diagnosis, and its presence does not necessarily distinguish one MPN from another or provide useful prognostic information. In general, quantitative cell-based JAK2V617F mutation assays are preferred because the additional information obtained on mutant allele burden enhances diagnostic certainty and facilitates monitoring of response to treatment. JAK2 exon 12 mutation screening is indicated only in the presence of JAK2V617F-negative erythrocytosis that is associated with a subnormal serum erythropoietin level. MPL mutations are neither frequent nor specific enough to warrant their routine use for MPN diagnosis, but they may be useful in resolving specific diagnostic problems. The practice of en bloc screening for JAK2V617F, JAK2 exon 12, and MPL mutations is scientifically irrational and economically irresponsible.     

骨髓增殖性肿瘤患者活化蛋白C抵抗和凝血功能异常研究

目的 研究骨髓增殖性肿瘤(MPN)患者活化的蛋白C抵抗(APC-R)、凝血、抗凝因子异常及与JAK2V617F突变负荷的相关性.方法 应用在有、无APC存在情况下的部分激活的凝血活酶时间(APTT)比值,即APC敏感比值(APCsr)评价APC-R的情况.检测43例真性红细胞增多症(PV)和32例原发性血小板增多症(ET)患者血浆蛋白C(PC)、蛋白S(PS)、凝血因子Ⅱ(FⅡ)、FV、FⅧ、中性粒细胞表面CD11b表达情况.应用实时定量PCR法检测PV患者JAK2V617F基因突变负荷情况并研究APCsr与凝血异常和JAK2V617F基因突变负荷的相关性.结果 与正常人相比,MPN患者中性粒细胞表面CD11b表达明显升高,APCsr、PS及FV明显减低.且APSsr在血栓栓塞和JAK2V617F基因突变负荷大于75%的PV患者中减低更为明显.MPN患者APCsr与PS表达水平呈正相关,与JAK2V617F突变负荷呈负相关.结论 MPN患者存在中性粒细胞活化增高,PS及FV表达水平减低.伴血栓栓塞的MPN患者存在APCsr减低,即一定程度的APC-R.MPN患者APCsr与PS及JAK2V617F突变负荷存在相关性.

Abstract：

Objective To study the correlation of activated proteinC ( APC ) resistance, coagulation factors and inhibitors abnormality and JAK2V617F mutation burden in patients with myeloproliferative neoplasms(MPN). Methods The APC resistance was defined as the ratio of activated partial thromboplastin time(APTT) in the presence and absence of APC, i. e. APC sensitivity ratio(APCsr). Plasma protein C ( PC ), protein S ( PS), prothrombin ( F Ⅱ ), factor V ( F Ⅴ ), factor Ⅷ levels and CD11b expression on neu trophils were measured. The percentage of mutated JAK2V617F allele ( V617F% ) was evaluated by real time polymerase chain reaction(qRT-PCR). Results Expression of CD11b on neutrophils was significantly elevated in MPN patients compared with that of the control group. APCsr, PS and F Ⅴ levels were reduced in patients with MPN. The APCsr level was decreased mainly in patients with thrombosis and JAK2V617F mutant burden higher than 75%. APCsr was not only positively correlated with PS levels but also inversely correlated with JAK2V617F allele burden in JAK2V617F mutant gene carriers. Conclusion The neutrophil was activated and PS,FⅤ level were reduced in MPN patients. The APCsr level was decreased and the occurrence of relatively acquired APC resistance was found in MPN patients with thrombosis. The APCsr is correlated with the PS level and JAK2V617F mutational furden.     

The JAK2 V617F mutation in patients with cerebral venous thrombosis

Summary. Background: It is currently unclear whether or not cerebral venous thrombosis, such as splanchnic venous thrombosis, can be the first manifestation of an underlying myeloproliferative neoplasm. Objective: To determine the prevalence of the JAK2 V617F mutation in patients with a first episode of cerebral venous thrombosis. Patients: In this retrospective cohort study, patients with cerebral venous thrombosis were tested for the JAK2 V617F mutation and were followed until the development of a myeloproliferative neoplasm or censored at the end of follow‐up. Results: Ten of 152 patients (6.6%) carried the JAK2 V617F mutation. Three of them had known acquired risk factors for thrombosis, and five had thrombophilia. Six patients met the diagnostic criteria for myeloproliferative neoplasm at the time of cerebral venous thrombosis, and three additional patients developed the disease during the follow‐up (median duration 7.8 years, range 6 months to 21.3 years), giving an annual incidence of 0.26% patient‐years (95% confidence interval 0.05–0.64). The last patient has no evidence of disease after 3 years of follow‐up. Patients without the JAK2 V617F mutation at the time of cerebral venous thrombosis were retested at the end of the follow‐up and remained negative, with normal blood counts (log‐rank test χ²: 159 [P < 0.0001]). Conclusions: Cerebral venous thrombosis can be the first symptom of a myeloproliferative neoplasm. Patients with cerebral venous thrombosis can carry the JAK2 V617F mutation, irrespective of blood count.     

The JAK2 V617F mutation frequently occurs in patients with portal and mesenteric venous thrombosis

BACKGROUND: Myeloproliferative disorders (MPDs) represent a risk factor for thrombosis in the portal, mesenteric, and hepatic districts. OBJECTIVE: We aimed to assess whether the Janus kinase 2 (JAK2) V617F mutation, an acquired mutation that occurs in MPD patients, is a risk factor for portal and mesenteric venous thrombosis (PMVT) independently of the presence of overt MPDs. PATIENTS AND METHODS: The medical histories of 99 patients presenting with PMVT were obtained. The presence of the JAK2 V617F and VHL 598C > T mutations was determined by polymerase chain reaction followed by restriction enzyme analysis and direct cycle sequence analysis. RESULTS: Over a 10-year period of observation, of the 99 patients presenting with PMVT, the JAK2 V617F mutation was detected in heterozygous state in 17 individuals [17.2%; 95% confidence interval (95% CI) 10.9-25.9]. None of the patients presenting with the JAK2 V617F mutation carried an inherited thrombophilic risk factor. Seven patients with (43.8%; 95% CI 19.8-70.1) and two without (2.4%; 95% CI 0.3-8.4) the JAK2 V617F mutation had a diagnosis of MPD at the occurrence of the venous thrombotic event. After a median follow-up of 41 months (range 3-114 months), three out of the 10 patients carrying the JAK2 V617F mutation were then diagnosed as having idiopathic myelofibrosis (n = 2) or polycythemia vera (n = 1), whereas in seven patients a MPD was not detected. Two of the 83 patients without the JAK2 V617F mutation went on to develop MPDs. CONCLUSIONS: Determination of the JAK2 V617F mutation may contribute to the search for genetic determinants of PMVT and may be useful to recognize patients who should be carefully observed for the subsequent development of overt MPDs.     

骨髓增殖性肿瘤患者外周血细胞中JAK2V617F突变和p-STAT5蛋白表达及其与临床特征的相关性

本研究旨在探讨骨髓增殖性肿瘤（MPN）患者外周血细胞中JAK2V617F突变和p-STAT5蛋白表达的情况及二者与疾病临床特征之间的相关性,为临床实践及靶向治疗研究提供理论依据。选择山东大学附属省立医院血液科确诊的45名BCR-ABL阴性的MPN患者及15例健康成年人为研究对象,提取外周血单个核细胞的DNA及蛋白质,分别采用实时荧光定量聚合酶链反应和免疫蛋白印迹法定量检测研究对象的朋K2V617F突变比例及p-STAT5蛋白表达量,并结合收集的临床病例资料进行相关性分析。结果表明,MPN患者JAK2V617F突变总体阳性率为73．3％（33／45）,其中真性红细胞增多症（PV）的以K2V617F突变阳性率为83．3％（20／24）,原发性血小板增多症（ET）的阳性率为68．8％（11／16）,特发性骨髓纤维化（IMF）患者的阳性率为40．0％（2／5）;PV、ET、IMF患者的J14K2V617F突变比例分别为0．472±0．245,0．216±0．162,0．435±0．239;p-STAT5蛋白表达灰度值分别为1．396±0．758,0．760±0．623,0．792±0．612;JAK2V617F突变负荷与p-STAT5蛋白表达灰度值呈线性相关（P〈0．05）;在PV患者中,JAK2V617F突变负荷越高,白细胞计数、血红蛋白水平及红细胞压积越高,血小板水平越低;ET患者中JAK2V617F突变负荷越高者,年龄越大,白细胞计数、血红蛋白水平及红细胞压积越高,与血小板水平无明显相关性;IMF患者中JAK2V617F突变负荷越高者白细胞、血小板计数、血红蛋白水平及红细胞压积均较低。JAK2V617F突变阳性者更易发生脾肿大、出血及血栓事件。结论：JAK2V617F突变在BCR-ABL阴性的MPN患者中阳性率较高,突变负荷越高者其下游p-STAT5蛋白的表达量越大,发生脾肿大、血栓事件的几率越高。     

骨髓增殖性疾病患者JAK2基因V617F突变频率、磷酸化JAK/STAT蛋白表达水平及临床意义

目的 探讨145例骨髓增殖件疾病患者JAK2基因V617F突变率;并分析JAK2基因V617F突变阳性患者的临床特点及意义.方法 应用PCR产物直接测序和等位基因特异性PCR技术检测145例骨髓增殖性疾病患者JAK2基因V617F突变.并应用Western blot方法测定JAK2基因V617F突变阳性患者JAK2蛋白、磷酸化JAK2蛋白及磷酸化STAT5蛋白表达;对JAK2基因V617F突变阳性与突变阴性的骨髓增殖性疾病患者临床资料进行比较,评价JAK2基因V617F突变阳性的临床意义.结果 ①本组病例真性红细胞增多症(PV)、特发性骨髓纤维化(ET)、原发性血小板增多症(IMF)患者JAK2基因V617F突变率分别为92%(64例中59例)、58%(43例中25例)和50%(38例中19例),等位基因特异性PCR检测较PCR产物直接测序有更高的JAK2基因V617F检出率[PV84%(64例中53例)、MIF 44%(43例中19例)、ET 39%(38例中15例)].②JAK2基因V617F突变阳性患者外周血单个核细胞磷酸化JAK2及磷酸化STAT5蛋白表达较突变阴性者明显增高(P<0.05).③JAK2基因V617F突变阳性骨髓增殖性疾病患者发病平均年龄偏大;平均白细胞计数高于突变阴性患者;血小板计数小于突变阴性患者;脾脏较突变阴性患者小;JAK2基因V617F突变阳性PV、ET和IMF患者血栓性事什发生率分别为17%、32%和16%;而突变阴性PV、ET和IMF患者血栓性事件发生率分别为0、16%和5%.结论 骨髓增殖性疾病患者有较高的JAK2基因V617F突变发生率,且JAK2基因V617F突变阳性患者易发生血栓事件.     

135例骨髓增殖性肿瘤患者JAK2基因突变的定量研究

目的 研究JAK2基因突变在骨髓增殖性肿瘤(MPN)中的发生率和突变类型.并对突变转录本水平进行定量分析,初步探讨其临床意义.方法 采用突变序列扩增系统PCR(ARMS-PCR)法检测JAK2突变的发生率及其突变类型;采用毛细管电泳法定量分析JAK2突变转录本水平.结果 135例MPN患者共检出95例JAK2V617F阳性,总阳性率为70.4%;真性红细胞增多症(PV)患者JAK2V617F突变发生率为97.4%,原发性血小板增多症(ET)为59.6%,3例特发性骨髓纤维化(IMF)中2例阳性;95例突变患者中纯合突变36例,杂合突变59例,其中PV患者纯合突变发生率为47.3%,高于ET患者的18.1%(P<0.05).纯合突变者其JAK2V617F突变转录本水平高于杂合突变者(P<0.05),杂合型PV患者的JAK2V617F突变转录本水平高于杂合型ET患者(P<0.05);JAK2V617F突变高表达组(转录本水平为70%～100%)的平均年龄高于低表达组(转录本水平为47.3%～70.0%),且两者年龄均较JAK2V617F阴性组为高(P<0.05);年龄<60岁者其JAK2V617F转录本水平低于≥60岁者(P<0.001);PV患者中,JAK2V617F高表达组其白细胞计数高于低表达组(P<0.001),ET患者中,JAK2V617F高表达组其白细胞计数高于低表达组(P<0.05),且二者均较阴性组为高(P<0.05),血红蛋白水平在高表达组与低表达组间差异无统计学意义(P>0.05),但二者均较阴性组为高(P<0.05).101例患者进行了染色体检查,未发现核型异常与JAK2V617F突变之间存在相关性.结论 ARMS-PCR可作为检测JAK2V617F突变较灵敏的方法 ,结合毛细管电泳可用于此突变的定量分析以及临床MPN的诊断和微量残留病的检测.     

特发性骨髓纤维化患者JAK2V617F突变研究

为了探讨特发性骨髓纤维化（IMF）JAK2V617F点突变发生率及其临床意义,运用等位基因特异性聚合酶链式反应（AS-PCR）检测12例IMF患者的JAK2V617F点突变,并探讨JAK2V617F变化与临床、血液学特征的相关性。结果显示：随访期2-15个月,12例患者JAK2V617F点突变检测阳性率为50%,而半数患有血栓史,其血小板数目及骨髓巨核细胞数目相对增多。另6例JAK2V617F点突变阴性患者仅1例有血栓史,血小板数目及骨髓巨核细胞数目相对较低。结论：JAK2V617F点突变阳性IMF患者多数具有典型的临床表现及血液学特点,其血小板数目及骨髓巨核细胞数目相对增多。     

骨髓增殖性肿瘤患者JAK2V617F基因突变与血栓栓塞相关性研究

目的 探讨骨髓增殖性肿瘤(MPN)患者JAK2V617F点突变发生情况及与血栓栓塞之间的相关性.方法 回顾性统计分析107例MPN患者的临床及实验室检查资料,应用等位基因特异性-聚合酶链反应(AS-PCR)及序列测定方法,检测MPN患者JAK2V617F点突变发生情况,结合JAK2V617F点突变阳性与阴性两组患者血栓栓塞发生情况,探讨其在疾病诊断及与血栓栓塞发生之间的意义.结果 ①107例MPN患者中共检出71例患者存在JAK2V617F突变,总突变率为66.4%.107例MPN患者共发现34例患者存在血栓栓塞(发生率为31.8%).②血栓发生率真性细胞增多症(PV)组为34.8%,原发性血小板增多症(ET)组32.6%,原发性骨髓纤维化(PMF)组22.2%,三组间χ2=0.96,P＞0.05.34例血栓患者中,JAK2V617F阳性患者28例,阴性患者6例,两组间χ2=5.71,P＜0.05.65例年龄≥60岁患者27例并发血栓栓塞(41.5%),42例年龄＜60岁者中7例并发血栓栓塞(16.7%),两组间比较χ2=7.28,P＜0.01.结论 MPN患者JAK2V617F发生率较高,JAK2V617F阳性及高龄(≥60岁)患者更易并发血栓栓塞,对不明原因血栓患者进行JAK2筛查可明确是否存在早期不典型MPN.     

30例早期骨髓增殖性疾病疑似患者JAK2V617F和MPLW515L/K突变基因的表达

目的 探讨BPC及Hb水平轻微升高,但未达真性红细胞增多症(PV)或原发性血小板增多症(ET)诊断标准的患者JAK2V617F及MPLW515L的表达情况与某些临床特征的相关性在早期骨髓增殖性疾病(MPD)中的诊断价值.方法 采用等位基因特异性PCR方法,检测30例BPC或Hb值偏高的早期MPD疑似患者JAK2V617F和MPLW515L/K基因表达,并定期随访其病情进展.结果 30例患者中有14例(46.7%)存在JAK2V617F突变,且此14例患者中有5例(35.7%)曾有血栓史;30例患者中无一例存在MPLW515L表达;有效随访22例,JAK2V617F阳性12例,阴性10例,12例阳性患者经过6至24个月后均发展为典型的MPD,而10例阴性患者只有2例发展成MPD.结论 JAK2V617F阳性表达有可能作为诊断早期MPD的重要依据.     

Frequency and characteristics of the JAK2 V617F mutation in 23 cerebral venous sinus thrombosis patients with thrombocytosis

ObjectiveTo analyse the frequency and characteristics of the Janus kinase 2 (JAK2) V617F mutation in patients with cerebral venous sinus thrombosis (CVST) with thrombocytosis.MethodsThe study enrolled CVST patients with thrombocytosis that had undergone JAK2 V617F mutation detection to determine the frequency of the JAK2 V617F mutation in this cohort. Correlations between patient demographics, whole blood cell counts, targeted sequencing results and JAK2 V617F mutation status were determined.ResultsA total of 23 patients were enrolled in the study: 11 (47.8%) with the JAK2 V617F mutation and 12 (52.2%) without the JAK2 V617F mutation. The mean platelet count was significantly higher in patients with the JAK2 V617F mutation than in patients without the mutation (478.1 ± 107.4 × 10⁹/l versus 374.4 ± 54.1 × 10⁹/l, respectively). There were no significant differences in age, sex, white blood cell count or haemoglobin level between the two groups. Other than single nucleotide polymorphisms, no hot-spot mutations associated with myeloid tumours other than the JAK2 V617F mutation were detected in four CVST patients that underwent targeted sequencing.ConclusionThe JAK2 V617F mutation was frequently detected in CVST patients with thrombocytosis and it was associated with higher platelet counts.     

骨髓增殖性肿瘤中JAK2V617F突变和TNF-α的表达及两者的相关性研究

本研究旨在探讨骨髓增殖性肿瘤（MPN）患者外周血单个核细胞中JAK2V617F突变和TNF-α因子的表达情况及两者之间的相关性,为临床诊断及治疗提供理论依据.选取山东大学附属省立医院血液科确诊的62名BCR-ABL阴性的MPN患者（35例ET患者,19例PV患者,8例MF患者）及15例健康成年人为研究对象,将患者及正常对照者的外周血单个核细胞分为两部分,分别提取细胞中的DNA及mRNA,并将mRNA反转录为cDNA.采用SYBR Green Ⅰ实时荧光定量PCR分别检测JAK2V617F突变及TNF-α的表达量,并分析两者的相关性.结果表明,MPN患者JAK2V617F基因突变总体阳性率为64.52％ （40/62）,其中ET患者的JAK2V617F突变阳性率为54.28％ （19/35）,PV患者的JAK2V617F突变阳性率为94.74％（18/19）,MF患者的JAK2V617F突变阳性率为37.50％（3/8）;ET、PV、MF患者的JAK2V617F突变比例分别为0.838±0.419、4.417±0.658、2.746±2.009;ET、PV、MF患者TNF-α的表达分别是正常对照的1.7、7.0、8.2倍（P＜0.05）;且JAK2V617F突变负荷与TNF-α的表达水平呈线性相关（Pearson r =0.610,R2 =0.372,P=0.005）.结论：TNF-α在BCR-ABL阴性的MPN发病机制中有重要作用,在ET、PV、MF中表达升高且表达量不同,且与JAK2V617F突变呈线性相关.     

JAK2V617F点突变与真性红细胞增多症的临床相关性研究

为探讨真性红细胞增多症（polycythemia vera,PV）JAK2V617F点突变的临床意义,应用等位基因特异性-聚合酶链反应（AS—PCR）检测50例患者的JAK2V617F点突变,并分析比较JAK2V617F点突变阳性与阴性两组患者的临床特征及实验室指标。结果显示：50例PV患者中31例存在JAK2V617F点突变,突变率为62．0％。12例（24．0％）患者发生血栓及微血管障碍,3例存在核型异常。JAK2V617F点突变阳性和阴性两组患者初诊时的年龄（57．5±10．0 vs 45．6±14．9,P〈0．05）和白细胞计数（16．2±6．7 vs 9．0±5．2,p〈0．05）有统计学差异。结论：PV患者的JAK2V617F点突变阳性率为62．0％,JAK2V617F点突变阳性患者的年龄和白细胞计数高于阴性患者。     

高分辨熔解曲线法检测骨髓增殖性肿瘤患者 JAK2V617F 基因突变简

本研究探讨高分辨率熔解曲线（High resolution melting,HRM）法检测骨髓增殖性肿瘤（MPN）患者JAK2V617F基因突变的可行性.随机抽取29份2008年1月至2011年1月确诊为MPN患者的骨髓标本,应用HRM法检测JAK2V617F基因突变情况,并与等位基因特异性聚合酶链反应（AS-PCR）和测序法的检测结果比较分析.结果表明,经HRM法检测,在29份MPN患者骨髓标本中检出JAK2 V617F突变阳性11例,突变率为37.9％;与基因测序法比较,结果完全一致,符合率100％.而AS-PCR法与测序法比较,Kappa=0.179,P=0.316,一致性强度较差.结论：HRM方法具有简便、快速、特异性高等优点,可作为临床JAK2V617F基因突变的优选方法.     

53例骨髓增殖性肿瘤的临床分析

目的 加强对骨髓增殖性肿瘤(MPN)的认识,提高其诊疗水平.方法 选择2007年3月至2012年2月江苏省兴化市人民医院收治的53例MPN患者为研究对象.回顾性分析其临床资料和相关实验室检查结果.结果 ①MPN发病高峰年龄为40～79岁,占86.79％(46/53);以慢性粒细胞白血病(CML)最为多见,占66.04％(35/53);临床表现不典型,脾大占77.36％.②MPN中不同疾病外周血血红蛋白(HB),RBC,WBC及PLT差异有统计学意义(P＜0.05).③6例真性红细胞增多症(PV)和4例原发性血小板增多症(ET)患者进行了JAK2V617F突变基因检查,阳性率分别为83.33％和75％;9例CML-慢性期患者检测了BCR/ABL基因,阳性率为100％.结论 MPN有发病年轻化的趋势,脾大为常见体征,血细胞持续增多结合JAK2V617F突变基因和BCR/ABL基因检测,可以准确诊断MPN,避免漏诊误诊.     

高分辨率熔解曲线法检测JAK2基因V617F突变及其应用

摘要:目的：探讨实时定量PCR方法和高分辨率熔解曲线法（HRM）在检测JAK2基因V617F突变中的应用。 方法：以JAK2基因V617F发生纯合突变的人红白血病细胞株（HEL）及不含JAK2基因V617F突变的人白血病细胞株（HL60）为阳性对照和阴性对照,优化HRM法检测条件,分别以优化的HRM法和直接测序法对63例临床疑似骨髓增殖性肿瘤（MPN）患者DNA标本进行JAK2基因V617F突变检测,评价2种检测方法结果的一致性。 结果：HRM法可检出系列混合样本中5%的突变型等位基因突变,且重复性较高。以测序法为金标准,HRM法的敏感性和特异性均为100％,两种方法结果一致。 结论：HRM法能够在单一闭管体系中实现对JAK2基因V617F突变的检测,具有较高的敏感性和特异性,可用于JAK2基因V617F突变的临床检测。     

Rapid detection of JAK2 V617F mutation using high-resolution melting analysis with LightScanner platform

BackgroundDetection of the JAK2 mutation has recently been included under the essential diagnostic criteria for myeloproliferative neoplasm (MPN). High-resolution melt (HRM) curve analysis, a nongel-based, automated system, is introduced as a means of mutation scanning without the requirement of any post-PCR handling.MethodsWe studied the sensitivity and reproducibility of LightScanner? platform in the detection of JAK2 V617F mutation and the availability for diagnostic use in MPN.ResultsThe reproducible sensitivity of HRM analysis with LightScanner? platform was 5% for the detection of JAK2 V617F mutation. In the test of blind screening of 105 samples (48 Ph? MPN and 57 Ph+ chronic myeloid leukemia), the identical judgement was interpreted by two blinded investigators. HRM analysis of all cases was fully concordant with the results of PCR-RFLP and direct sequencing.ConclusionsThe HRM method developed here is an extremely sensitive, accurate and reliable technique and allows high-throughput, fast pre-screening to select for sequencing only those specimens that most likely contain mutant JAK2 V617F allele(s).