BACKGROUND Angelman syndrome(AS)is caused by maternal chromosomal deletions,imprinting defects,paternal uniparental disomy involving chromosome 15 and the ubiquitin-protein ligase UBE3A gene mutations.However the gene...BACKGROUND Angelman syndrome(AS)is caused by maternal chromosomal deletions,imprinting defects,paternal uniparental disomy involving chromosome 15 and the ubiquitin-protein ligase UBE3A gene mutations.However the genetic basis remains unclear for several patients.AIM To investigate the involvement of UBE3A gene in AS and identifying new potential genes using exome sequencing.METHODS We established a cohort study in 50 patients referred to Farhat Hached University Hospital between 2006 and 2021,with a strong suspicion of AS and absence of chromosomal aberrations.The UBE3A gene was screened for mutation detection.Two unrelated patients issued from consanguineous families were subjected to exome analysis.RESULTS We describe seven UBE3A variants among them 3 none previously described including intronic variants c.2220+14T>C(intron14),c.2507+43T>A(Exon15)and insertion in Exon7:c.30-47_30-46.The exome sequencing revealed 22 potential genes that could be involved in AS-like syndromes that should be investigated further.CONCLUSION Screening for UBE3A mutations in AS patients has been proven to be useful to confirm the diagnosis.Our exome findings could rise to new potential alternative target genes for genetic counseling.展开更多
总结1例Angelman综合征(Angelman syndrome,AS)合并眼皮肤白化病2型(oculocutaneous albinism type 2,OCA2)患儿的临床诊疗过程及遗传学检测结果和特点,并以“Angelman综合征”“眼皮肤白化病2型”“Angelman syndrome”“Pgene”“Ocul...总结1例Angelman综合征(Angelman syndrome,AS)合并眼皮肤白化病2型(oculocutaneous albinism type 2,OCA2)患儿的临床诊疗过程及遗传学检测结果和特点,并以“Angelman综合征”“眼皮肤白化病2型”“Angelman syndrome”“Pgene”“Oculocutaneous albinism type 2”为关键词分别在CNKI、万方数据库及PubMed数据库(自建库至2019年12月)中检索,对国内外报道的AS合并OCA2病例进行汇总分析。本例患儿女,1岁,出生后即发现全身白,毛发色黄,眼球震颤,2个月会竖头,7个月会翻身,测头围42 cm,不能独坐,不会说话。家系全外显子组基因测序显示,患儿携带P基因c.168del(p.Gln58ArgfsTer44)纯合突变,经验证其父亲为杂合型,母亲为野生型。拷贝数变异检测提示,患儿母源染色体15q11.2-13.1区域缺失(P基因位于此区域内)。截至2019年12月,3个数据库中共检索到4篇相关文献,共报道了4例AS合并OCA2患儿,与本例一起进行汇总分析。AS合并OCA2患儿出生后均表现出皮肤白、毛发金黄、虹膜颜色浅,出生后6月龄左右发现全面发育迟缓,有2例随访至儿童期,语言始终无发育。4例患儿病程中出现癫痫发作,2例有共济失调,5例均有获得性小头畸形,2例白化病家族史阳性,3例完成脑电图监测结果均异常。遗传学检测结果显示,5例患儿均为母源性染色体15q11-13区域缺失,4例有父源15号染色体P基因突变,1例未进行P基因检测而根据临床诊断OCA2。AS合并OCA2病例相对少见,根据出生后明显的临床表现较容易获得OCA2临床诊断,当合并神经发育迟缓等临床表现时,提示早期临床难以诊断的AS可能,遗传学检测两者的交叉遗传现象可最终确诊此种复合病。展开更多
文摘BACKGROUND Angelman syndrome(AS)is caused by maternal chromosomal deletions,imprinting defects,paternal uniparental disomy involving chromosome 15 and the ubiquitin-protein ligase UBE3A gene mutations.However the genetic basis remains unclear for several patients.AIM To investigate the involvement of UBE3A gene in AS and identifying new potential genes using exome sequencing.METHODS We established a cohort study in 50 patients referred to Farhat Hached University Hospital between 2006 and 2021,with a strong suspicion of AS and absence of chromosomal aberrations.The UBE3A gene was screened for mutation detection.Two unrelated patients issued from consanguineous families were subjected to exome analysis.RESULTS We describe seven UBE3A variants among them 3 none previously described including intronic variants c.2220+14T>C(intron14),c.2507+43T>A(Exon15)and insertion in Exon7:c.30-47_30-46.The exome sequencing revealed 22 potential genes that could be involved in AS-like syndromes that should be investigated further.CONCLUSION Screening for UBE3A mutations in AS patients has been proven to be useful to confirm the diagnosis.Our exome findings could rise to new potential alternative target genes for genetic counseling.
文摘总结1例Angelman综合征(Angelman syndrome,AS)合并眼皮肤白化病2型(oculocutaneous albinism type 2,OCA2)患儿的临床诊疗过程及遗传学检测结果和特点,并以“Angelman综合征”“眼皮肤白化病2型”“Angelman syndrome”“Pgene”“Oculocutaneous albinism type 2”为关键词分别在CNKI、万方数据库及PubMed数据库(自建库至2019年12月)中检索,对国内外报道的AS合并OCA2病例进行汇总分析。本例患儿女,1岁,出生后即发现全身白,毛发色黄,眼球震颤,2个月会竖头,7个月会翻身,测头围42 cm,不能独坐,不会说话。家系全外显子组基因测序显示,患儿携带P基因c.168del(p.Gln58ArgfsTer44)纯合突变,经验证其父亲为杂合型,母亲为野生型。拷贝数变异检测提示,患儿母源染色体15q11.2-13.1区域缺失(P基因位于此区域内)。截至2019年12月,3个数据库中共检索到4篇相关文献,共报道了4例AS合并OCA2患儿,与本例一起进行汇总分析。AS合并OCA2患儿出生后均表现出皮肤白、毛发金黄、虹膜颜色浅,出生后6月龄左右发现全面发育迟缓,有2例随访至儿童期,语言始终无发育。4例患儿病程中出现癫痫发作,2例有共济失调,5例均有获得性小头畸形,2例白化病家族史阳性,3例完成脑电图监测结果均异常。遗传学检测结果显示,5例患儿均为母源性染色体15q11-13区域缺失,4例有父源15号染色体P基因突变,1例未进行P基因检测而根据临床诊断OCA2。AS合并OCA2病例相对少见,根据出生后明显的临床表现较容易获得OCA2临床诊断,当合并神经发育迟缓等临床表现时,提示早期临床难以诊断的AS可能,遗传学检测两者的交叉遗传现象可最终确诊此种复合病。
