目的了解BCR/ABL阴性B系急性淋巴细胞白血病（B-ALL）患儿IKZF1基因拷贝数异常情况,并分析IKZF1基因拷贝数异常与该部分患儿预后的相关性。方法应用多重连接探针扩增（MLPA）技术检测180例初诊BCR/ABL阴性B-ALL患儿IKZF1基因拷贝数异常情况。根据有无IKZF1基因缺失将其分成两组：IKZF1缺失组和IKZF1正常组。回顾性分析IKZF1拷贝数缺失与BCR/ABL阴性B-ALL患儿预后的关系。结果 180例患儿中共有27例（15.0%）患儿发生了IKZF1缺失,其中IKZF1基因8个外显子全部缺失者4例,单纯1号外显子缺失者17例,4～7号外显子缺失者3例,2～7号外显子缺失者3例。IKZF1缺失组患儿初诊时白细胞水平及流式MRD-高危组患儿的比例明显高于IKZF1正常组;IKZF1缺失组患儿多发生在无特殊融合基因异常的BCR/ABL阴性患儿,且IKZF1基因缺失患儿易伴随出现11、8、5、7、21号等染色体的异常。Kaplan-Meier法分析显示,IKZF1缺失组无病生存率（DFS）明显低于IKZF1正常组（0.740±0.096 vs 0.905±0.034,P=0.002）。Cox法分析显示在排除了年龄、性别、初始WBC、初诊时脑脊液状态、泼尼松松试验反应情况、染色体核型后,IKZF1缺失仍不利于患儿的DFS（P〈0.05）。结论部分BCR/ABL阴性B-ALL患儿存在IKZF1缺失,IKZF1缺失为BCR/ABL阴性B-ALL患儿DFS的独立危险因素。
本研究从DNA双链断裂同源重组修复角度探讨UNC13D(秀丽新小杆线虫)基因参与Ⅲ型家族性噬血细胞性淋巴组织细胞增生症(familial hemophagocytic lymphohistiocytosis type 3,FHL3)的发病机制。利用DNA同源重组修复方法,检测正常对照组及UNC13D基因下调后DR-U2OS细胞同源重组修复率的变化情况,并研究此基因的相关功能。结果表明:下调DR-U2OS细胞的UNC13D基因表达后,同源重组修复率较正常对照组明显下降,且差异有统计学意义(P<0.05),提示UNC13D编码蛋白Munc13-4不仅参与到细胞毒颗粒的胞吐过程中,而且在DNA双链断裂修复中也起作用。结论:UNC13D基因突变可能通过抑制细胞毒颗粒的胞吐和降低DNA双链断裂后的同源重组修复率参与FHL3发病过程,这一研究结果为揭示FHL3的发病机制提供新的理论基础。
Children with severe aplastic anemia(SAA)face heterogeneous prognoses after immunosuppressive therapy(IST).There are few models that can predict the long-term outcomes of IST for these patients.The objective of this paper is to develop a more effective prediction model for SAA prognosis based on clinical electronic medical records from 203 children with newly diagnosed SAA.In the early stage,a novel model for long-term outcomes of SAA patients with IST was developed using machine-learning techniques.Among the indicators related to long-term efficacy,white blood cell count,lymphocyte count,absolute reticulocyte count,lymphocyte ratio in bone-marrow smears,C-reactive protein,and the level of IL-6,IL-8 and vitamin B12 in the early stage are strongly correlated with long-term efficacy(P<.05).Taken together,we analyzed the long-term outcomes of rabbit antithymocyte globulin and cyclosporine therapy for children with SAA through machine-learning techniques,which may shorten the observation period of therapeutic effects and reduce treatment costs and time.
