两个新RUNX2基因突变引起家族性锁骨颅骨发育不全

目的 探讨RUNX2基因突变在锁骨颅骨发育不全病因研究中的意义及两个中国家族性锁骨颅骨发育不全家系发病的分子机制.方法 提取收集到的2个锁骨颅骨发育不全家系中4例患者和4名家系健康成员、102名无关正常对照外周血基因组DNA,应用PCR扩增产物双向直接测序方法 检测RUNX2基因第1～7外显子及相邻侧翼区的DNA序列,测序结果 与RUNX2基因正常序列对比分析.对发现的突变位点用酶切方法 证实.结果 测序结果 发现一家系中两例父子患者的RUNX2基因第1外显子发生错义突变c.346T＞A(W116R),该错义突变通过Bsr Ⅰ限制性内切酶对PCR扩增产物行酶切分析得到进一步确认.另一家系中两例患者的RUNX2基因第3外显子发生无义突变c.610A＞T(K204X).在两个家系中的正常家系成员和无关正常对照RUNX2基因DNA序列中没有发现上述突变.结论 通过RUNX2基因,检测在中国人群中发现两个RUNX2基因新致病突变,扩展了遗传性锁骨颅骨发育不全的基因突变谱,对阐明该病发病机制及其基因诊断和遗传咨询有重要意义.     

颅骨锁骨发育不全家系基因多态性与表型关系的研究

目的研究家族性颅锁骨发育不全家系基因型与临床表型的关系。方法提取临床收集的一个先天性颅锁骨发育不全家系中患者和健康成员外周血基因组DNA,PCR扩增RUNX2/CBFA1基因7个编码外显子及其侧翼内含子序列,分别进行正反向测序,对发现的突变位点行酶切分析验证。结果家系中两位患者（先证者及其父亲）显示cDNA 346T→A的杂合突变,使编码的色氨酸变成精氨酸（W 116R）,属错义突变。酶切结果进一步证实了该错义突变。测序还发现先证者父亲cDNA 198G→A的杂合突变,致第66位氨基酸的密码子GCG被GCA取代,但二者均编码丙氨酸,属同义突变。先证者及家系健康成员中未见此改变。结论 RUNX2/CBFA1基因346T→A杂合突变是该家系发病的分子基础。     

酒精性股骨头坏死动物模型的建立和观察

目的建立酒精性股骨头坏死动物模型,探讨其发病机制。方法选择健康昆明小白鼠40只随机分为实验组和对照组,实验组灌胃给予烈性(52度)白酒20mL/(kg·d),对照组灌胃给予10%葡萄糖溶液20mL/(kg·d)。于实验第4周、6周分批处死动物,取小白鼠双侧股骨头,进行Verhoeff氏染色及HE染色,观察股骨头组织学变化。结果实验组动物股骨头脂肪细胞体积增大,空骨陷窝数明显增加。结论过量酒精引起的股骨头脂肪细胞体积增大、空骨陷窝数增加,可能是导致股骨头坏死的重要原因。     

两个新RUNX2基因突变引起家族性锁骨颅骨发育不全

Objective To identify the RUNX2 gene mutation in two unrelated Chinese families with cleidocranial dysplasia (CCD), and to assess the feasibility of gene diagnosis for patients with CCD. Methods Genomic DNA was isolated from peripheral blood samples of 4 patients and 4 healthy members in the two pedigrees as well as 102 unrelated healthy controls. All 7 coding exons and their flanking intronic sequences of the RUNX2 gene were amplified by PCR, then the PCR products were sequenced bi-directionally. The sequencing results were compared with normal sequences in GenBank to identify the mutation. The mutation was confirmed by RFLP with restriction endonuclease. Results In one family, a novel heterozygous missense mutation c. 346T＞A (W116R) in exon 1 of the RUNX2 gene was detected in the two affected individuals, and the mutation was further confirmed with Bsr Ⅰ restriction endonuclease digestion. In the other family, a novel nonsense mutation c. 610A＞T (K204X) was identified in the two patients. No above sequence change was found in the 102 healthy controls. Conclusion Two novel RUNX2 mutations were found in two unrelated Chinese families with cleidoeranial dysplasia. The identification of these mutations further extended the mutation spectrum of RUNX2 gene and will facilitate prenatal diagnosis and gene diagnosis of CCD.     

先天性颅锁骨发育不全家系基因诊断探讨

目的探讨家族性颅锁骨发育不全家系的基因诊断方法。方法提取临床先天性颅锁骨发育不全两个家系中患者和健康成员外周血基因组DNA,PCR扩增RUNX2/CBFA1基因7个编码外显子及其侧翼内含子序列,分别进行正反向测序,测序结果与GenBank中的原始序列进行比对分析。根据人类基因突变命名规则确认测序发现的碱基突变。结果测序结果发现一家系中2例父子患者的RUNX2基因外显子1发生错义突变c.346T→A(W116R);另一家系中2位患者的RUNX2基因外显子3发生无义突变c.610A→T(K204X)。在2个家系中的健康成员和无关正常对照RUNX2基因DNA序列中没有发现上述突变。结论 RUNX2基因检测是对家族性颅锁骨发育不全家系进行基因诊断的准确有效方法,对其遗传咨询有重要意义。     

先天性颅锁骨发育不全家系分析

颅锁骨发育不全(CCD)是一种具有遗传异质性的全身性骨发育障碍及骨-牙形成障碍疾病.本病以常染色体显性遗传最多见,发病率约百万分之一,大约2/3有家族史,性别间无明显差异,可在任何年龄发病,具有突发性,一旦突发即有较高的外显率和不同表现.本文分析收集到的两个CCD无关家系的临床特征,现报道如下.     

孤独症患儿食物不耐受情况及忌食不耐受食物的治疗效果

目的探讨孤独症患儿的食物不耐受情况及忌食不耐受食物的治疗效果。方法选取孤独症患儿82例为孤独症组,健康儿童20例为健康对照组,采用酶联免疫吸附法(ELISA)检测二组血清14种食物过敏原IgG水平,并加以比较,对食物过敏原结果阳性的患儿忌食不耐受食物。结果孤独症组食物过敏原特异性IgG抗体水平显著高于健康对照组(P<0.05),忌食不耐受食物后,孤独症组患儿症状较治疗前好转,治疗前后比较差异有统计学意义(P<0.05)。结论食物过敏原特异性IgG抗体测定有助于及早发现孤独症患儿的食物不耐受,忌食不耐受食物对治疗孤独症有一定意义。     

两个新RUNX2基因突变引起家族性锁骨颅骨发育不全

Objective To identify the RUNX2 gene mutation in two unrelated Chinese families with cleidocranial dysplasia (CCD), and to assess the feasibility of gene diagnosis for patients with CCD. Methods Genomic DNA was isolated from peripheral blood samples of 4 patients and 4 healthy members in the two pedigrees as well as 102 unrelated healthy controls. All 7 coding exons and their flanking intronic sequences of the RUNX2 gene were amplified by PCR, then the PCR products were sequenced bi-directionally. The sequencing results were compared with normal sequences in GenBank to identify the mutation. The mutation was confirmed by RFLP with restriction endonuclease. Results In one family, a novel heterozygous missense mutation c. 346T＞A (W116R) in exon 1 of the RUNX2 gene was detected in the two affected individuals, and the mutation was further confirmed with Bsr Ⅰ restriction endonuclease digestion. In the other family, a novel nonsense mutation c. 610A＞T (K204X) was identified in the two patients. No above sequence change was found in the 102 healthy controls. Conclusion Two novel RUNX2 mutations were found in two unrelated Chinese families with cleidoeranial dysplasia. The identification of these mutations further extended the mutation spectrum of RUNX2 gene and will facilitate prenatal diagnosis and gene diagnosis of CCD.