眼科

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两个成骨不全家系的COL1A1基因突变筛查及临床特征分析

冯丙岂  刘旭阳  何芬  李丹丽  张达人  赵林  樊宁   

  1. 518040 暨南大学第二临床医学院 深圳市眼科医院 深圳眼科学重点实验室(冯丙岂、刘旭阳、何芬、李丹丽、樊宁);361005 厦门大学附属厦门眼科中心(刘旭阳、张达人);615000 四川凉山州第二人民医院(赵林)
  • 收稿日期:2019-03-03 出版日期:2019-07-25 发布日期:2019-07-30
  • 通讯作者: 樊宁,Email:szfanning@126.com
  • 基金资助:

    国家自然科学基金项目(81770924);深圳市医疗卫生三名工程(SZSM201512045)

Molecular genetics and clinical manifestations analysis of COL1A1 gene in two Chinese families with osteogenesis imperfecta 

FENG Bing-kai1, LIU Xu-yang1,2, HE Fen1, LI Dan-li1, ZHANG Da-ren2, ZHAO Lin3, FAN Ning1.   

  1. 1. Second Clinical Medical College of Jinan University, Shenzhen Eye Hospital, Shenzhen Key Laboratory of Ophthalmology, Shenzhen 518040, China; 2. Xiamen Eye Center of Xiamen University, Xiamen 361005, China; 3. Second People’s Hospital of Liangshan, Sichuan 615000, China
     
  • Received:2019-03-03 Online:2019-07-25 Published:2019-07-30
  • Contact: FAN Ning, Email: szfanning@126.com

摘要:

 目的 分析2个成骨不全(osteogenesis imperfecta,OI)家系的临床特征和分子遗传学特点。设计 回顾性病例系列。研究对象 2个分别位于四川和广东的汉族成骨不全家系成员共45人,其中家系1本课题组曾在GMR杂志报道,作者对其进行了5年的追踪观察。方法 收集家系成员的详细临床资料并进行眼部和全身检查,采集家系患者和正常成员的外周血进行基因组DNA提取,筛选疾病相关基因序列改变,在家系成员和正常个体中进行验证分析,确定致病基因和突变位点,分析其与患者临床特征的关系,并对两个家系进行对比分析。主要指标 既往病史、视力、角膜厚度、眼前节和眼后节检查、听力检测、X线检查以及基因测序结果。 结果 2个家系分别诊断为Ⅰ型和Ⅳ型,均符合常染色体显性遗传模式,临床表现的共同特征是巩膜为蓝色、角膜厚度薄、反复非强力骨折、听力下降、脊柱畸形,不同之处在于家系2患者还合并身材矮小、牙本质发育不全,全身骨骼畸形更为明显。分子遗传学分析发现,家系1为COL1A1基因第33号外显子杂合突变(c.2329delG),引起第777位密码子移码突变(p.Ala777Profs*330),造成COL1A1蛋白合成缺陷;家系2为COL1A1基因第10号外显子杂合突变(c.725G>T),引起第242位氨基酸由甘氨酸(Gly)突变为缬氨酸(Val)(p.Gly242Val);家系1突变为本课题组发现的突变并已经报道,家系2为COL1A1基因新突变。结论 本研究中2个OI家系分别是由于COL1A1基因c.2329delG和c.725G>T突变导致,本研究结果丰富了COL1A1基因突变谱,有助于OI基因型与临床表型关系的研究。(眼科,2019, 28: 273-279)

关键词:  , 成骨不全;COL1A1基因;Ⅰ型胶原蛋白;分子遗传学

Abstract:

Objective To analyze the characteristic of molecular genetics and clinical manifestations in 2 families with osteogenesis imperfecta (OI). Design Retrospective case serie. Participants 2 Chinese OI families from Sichuan and Guangdong provinces, one of these we had reported in <Genetics & Molecular Research> and was followed up for five years in this study. Methods The families members received clinical examinations to evaluate ocular and skeleton conditions. Peripheral blood samples were collected and the DNA was extracted for pathogenic mutations identification. Main Outcome Measure Medical history, visual acuity, central corneal thickness (CCT), anterior and posterior segment examination, hearing, X-ray inspection and gene sequencing. Results These two OI families were respectively diagnosed with type Ⅰ and type Ⅳ OI, both following an autosomal-dominant pattern of inheritance and sharing same clinical findings including blue sclera, corneal thinning, recurrent fracture, hearing loss and spinal deformity, but short stature, dentinogenesis imperfecta and worse skeletal deformity were only found in family 2. Results of gene sequencing revealed a novel deletion we had reported (c.2329delG, p.Ala777Profs*330) in exon 33 of COL1A1 gene in family 1 causing a frameshift alteration after codon 777 leading to a truncated protein, and a novel heterozygous point mutation (c.725G>T, p.Gly242Val) in family 2. Conclusion Our findings identified 2 novel mutations (c.2329delG, c.725G>T) in the COL1A1 gene, which were associated with pathogenesis of OI in these 2 Chinese families. (Ophthalmol CHN, 2019, 28: 273-279)
 

Key words: osteogenesis imperfecta, COL1A1, collagen type 1, molecular genetics