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目的: 探讨选择性先天缺牙患者的遗传学病因。方法: 对2例非综合征型先天缺牙患者进行临床检查、家系调查、影像学检查以及外周血采集,通过全外显子测序后与正常人类基因组比对,并进行Sanger测序验证,确定致病基因及突变位点后,进行蛋白结构预测和多物种保守性分析。结果: 2例选择性先天缺牙家系中家系1为散发型,家系2为家族型。全外显子测序结果显示,先证者1和先证者2分别存在LRP6无义突变(II:1, c.C1573T,p.R525X)以及移码突变(II-1, c.4611delT ,p.C1537fs)。蛋白结构分析表明,p.R525X使LRP6蛋白截短,为失功能突变。多物种保守性分析揭示位点在进化过程中高度保守,提示突变具备有害性。结论: 2例选择性先天缺牙家系可能由于LRP6突变导致,为遗传咨询和产前诊断提供了参考。 相似文献
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目的:探讨维吾尔族单纯型先天缺牙患者标本中AXIN2基因的突变位点。方法:收集维吾尔族非单纯型先天缺牙家系3个,采集家系患者颊黏膜拭子提取DNA,采用聚合酶链反应技术,对分段纯化的PCR产物进行DNA双向测序检测患者的DNA。结果:3个家系的单纯型先天缺牙临床表型符合常染色体显性遗传规律,患者出现不同数量的缺失牙或伴发锥形牙。测序后检测出AXIN2的3个可能的SNP位点。结论:AXIN2基因片段中某些编码基因的改变可能与维吾尔族单纯型先天缺牙有关。 相似文献
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目的 对4个少汗型外胚层发育不全家系的EDA基因进行测序分析,研究突变的位置、类型,为临床诊断提供遗传学依据.方法 提取先证者及其亲属的基因组DNA,其中患者5人,无症状者12人,另外抽取100名无先天缺牙家族史的正常成人外周血,提取基因组DNA作为对照,设计EDA基因8个外显子的引物,通过聚合酶链反应和DNA测序的方法与正常序列比对.结果 4个家系的患者均存在EDA基因不同位点的突变,分别为c.466C>T、c.663-697缺失、c.587-615缺失、c.878T>G,携带者存在杂合突变,正常对照不存在以上突变.结论 EDA基因的c.466C>T、c.663-697缺失、c.587-615缺失、c.878T>G突变是导致家系先证者及患者出现少汗型外胚层发育不全的病因.其中,EDA基因的c.663-697缺失、c.587-615缺失、c.878T>G是未报道的新突变. 相似文献
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目的 研究一先天缺牙家系的遗传学特点并探寻其可能的致病基因。方法 一先天缺牙家系3代共17人,在患者和家属知情同意及伦理委员会批准的前提下对全部成员进行临床检查和X线辅助检查,抽取其家系成员静脉血,提取DNA,应用基因芯片技术进行基因筛查,对可疑基因FGF20进行聚合酶链式反应(PCR)并测序。结果 该非综合征型先天缺牙家系为3代连续遗传,且没有性别差异,外显率为100%,诊断为常染色体显性遗传;基因芯片检测提示FGF20可能为该家族先天缺牙的致病基因,但经PCR检测未发现突变位点。结论 先天缺牙的致病机制较复杂,可能是多基因联合控制的疾病;基因芯片技术在筛查牙齿先天缺失家系的致病基因方面仍有一定的局限性。 相似文献
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先天缺牙是牙齿发育过程中常见的牙数目发育异常,对患者的颌面部发育及美观和咀嚼功能产生严重的影响。根据有无伴发全身症状,先天缺牙可分为综合征型先天缺牙与非综合征型先天缺牙。近几年发现新的相关基因和新的突变位点及分子机制已成为目前非综合征型先天缺牙基因研究的主要方向。本文通过对近年来文献的回顾,对与非综合征型先天缺牙主要相关的Wnt/β-catenin信号通路、TGF-β/BMP信号通路、PAX9基因和MSX1基因、EDA/EDAR/NF-κb信号通路的分子机制以及相互调节的紧密联系进行综述,为未来先天缺牙的防治提供了新的理论基础。非综合征型先天缺牙致病基因的分子机制的研究目前甚少,对于其机制的精准探索将成为先天缺牙未来主要的研究方向之一。 相似文献
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目的:通过对AXIN2基因多态性与单纯性多数牙先天缺失关系的探讨,寻找该病发病的可能基因因素。方法对单纯性多数牙先天缺失家系中患者进行临床和实验室相关检查;而后提取基因组DNA ,通过RT?PCR方法对AXIN2基因的外显子进行扩增、测序,同时分析基因突变类型。结果 DNA测序显示,在AXIN2基因的3号外显子及附近的内含子区2例患者出现3个相同类型的基因突变,分别是:c.1365A>G(p.Pro455=),c.956+16A>G(Ⅱ?1:纯合型;Ⅲ?1:杂合型),c.1200+71A>G(纯合型),同时先证者的母亲(Ⅱ?2)出现c.1365A>G和c.1200+71A>G的杂合突变类型。经生物信息软件分析认为均是多态性位点。结论 AXIN2基因的c.956+16A>G,c.1365A>G和c.1200+71A>G突变可能与该家系的单纯性多数牙齿缺失密切相关,但AXIN2在多数牙缺失发生发展各阶段的确切作用还需要进一步的研究。 相似文献
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Tooth agenesis: from molecular genetics to molecular dentistry 总被引:1,自引:0,他引:1
Tooth agenesis may originate from either genetic or environmental factors. Genetically determined hypodontic disorders appear as isolated features or as part of a syndrome. Msx1, Pax9, and Axin2 are involved in non-syndromic hypodontia, while genes such as Shh, Pitx2, Irf6, and p63 are considered to participate in syndromic genetic disorders, which include tooth agenesis. In dentistry, artificial tooth implants represent a common solution to tooth loss problems; however, molecular dentistry offers promising solutions for the future. In this paper, the genetic and molecular bases of non-syndromic and syndromic hypodontia are reviewed, and the advantages and disadvantages of tissue engineering in the clinical treatment of tooth agenesis are discussed. 相似文献
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Yanyu Huang Yongbo Lu Gabriele Mues Suzhen Wang John Bonds Rena D'Souza 《European journal of oral sciences》2013,121(4):313-318
The detection of gene mutations in patients with congenitally missing teeth is not very complicated; however, proving causality is often quite difficult. Here, we report the detection of a substitution mutation, A42P, within the prodomain of bone morphogenetic protein 4 (BMP4) in a small family with tooth agenesis and describe a functional alteration that may be responsible for the tooth phenotype. As BMP4 is essential for the development of teeth and also for many other organs, it would be of considerable interest to find a BMP4 mutation that is associated only with tooth agenesis. Our in vitro investigations revealed that the A42P mutation neither affected processing and secretion of BMP4 nor altered functional properties, such as the induction of alkaline phosphatase or signaling through Smad1/5/8 phosphorylation by the mature BMP4 ligand. However, immunofluorescence staining revealed that the prodomains of BMP4 which harbor the A42P substitution form fibrillar structures around transfected cells in culture and that this fibrillar network is significantly decreased when mutant prodomains are expressed. Our finding suggests that in vivo, BMP4 prodomain behavior might also be altered by the mutation and could influence storage or transport of mature BMP4 in the extracellular matrix of the developing tooth. 相似文献
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Ebtesam M. Abdalla Adrianna Mostowska Paweł P. Jagodziński Karin Dwidar Suzan R. Ismail 《Archives of oral biology》2014
Objective
Tooth agenesis is the most common dental anomaly, whose aetiology still remains to be fully elucidated. The aim of this study was to investigate the genetic cause of non-syndromic hypodontia with clinical variability in an Egyptian family.Design
The entire coding regions including exon-intron boundaries of the MSX1, PAX9 and WNT10A genes were investigated by direct sequencing in all affected family members.Results
Novel heterozygous mutation inherited in an autosomal dominant manner was identified in the WNT10A gene. This 21-bp deletion combined with 1-bp insertion, c.-14_7delinsC, eliminates the translation initiation codon leading to either no protein production or translation of alternative open reading frames. None of the control subjects (400 chromosomes) were carriers of this novel WNT10A mutation. No pathogenic mutations were found in the MSX1 and PAX9 genes.Conclusions
The novel c.-14_7delinsC mutation might be the etiological variant of the WNT10A gene responsible for the permanent tooth agenesis in the Egyptian family. WNT10A is a major candidate gene for non-syndromic hypodontia. 相似文献15.
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先天性缺牙是人类牙列中最常见的发育异常,包括个别牙先天缺失,多数牙先天缺失和先天无牙症。多数牙先天缺失按照其表现型不同通常可分为综合征型和非综合征型,表现为常染色体的显性或隐性遗传、X-连锁遗传特性,有的具有家族遗传史,有的则是无家族史的散发病例。本文就近年来非综合征型牙齿发育不全研究中的热点基因PAX9的研究进展作一综述。 相似文献
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A new hypo/oligodontia syndrome: Carvajal/Naxos syndrome secondary to desmoplakin-dominant mutations
Chalabreysse L Senni F Bruyère P Aime B Ollagnier C Bozio A Bouvagnet P 《Journal of dental research》2011,90(1):58-64
Dental agenesis is either syndromic or non-syndromic. Here, we describe a familial case with Carvajal/Naxos syndrome associating woolly hair, palmoplantar keratoderma, and biventricular dilated cardiomyopathy. In addition to these signs, all three affected family members had hypo/oligodontia ranging from absence of the lower left second molar to 15 missing teeth, the typical pattern of oligodontia being absent 2nd premolars and absent 2nd and 3rd molars. Mutation screening in the desmoplakin gene (DSP) revealed a de novo missense mutation (c.1790 C>T, p.Ser597Leu) changing a serine residue conserved in all vertebrates. In addition, this variation was absent from 100 control DNA samples. There were no mutations in the plakoglobin gene. This familial case report and two other previous reports demonstrate that autosomal-dominant mutations in the DSP gene are associated with hypo/oligodontia in the setting of Carvajal/Naxos syndrome. This study suggests that dentists discovering oligo/hypodontia should screen for woolly hair and palmoplantar keratoderma because of the probable cardiac involvement with an inherent high risk of severe cardiomyopathy. In addition, this study reveals the role of desmosomes in the development of teeth and suggests that other genes encoding proteins of the desmosome could be involved in oligo/hypodontia. 相似文献
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