Mucopolysaccharidosis type II is of high ge-netic heterogeneity. PCR-DNA sequencing was used to study the mutation hot spots in the IDS gene of a Chinese MPS II pedigree. A new mutation (1467-A) not yet reported world...Mucopolysaccharidosis type II is of high ge-netic heterogeneity. PCR-DNA sequencing was used to study the mutation hot spots in the IDS gene of a Chinese MPS II pedigree. A new mutation (1467-A) not yet reported world-wide was detected. This mutation located at 448th codon in the coding region of exon 9 deletes one “A” at the end of 1467 bp (cDNA). The frame-shift mutation makes the peptide chain shorten from amino acids 550 to 459, probably altering the configuration of IDS enzyme protein remarkably and lowering the activation of IDS greatly. Therefore it is sup-posed to be the direct cause of the patient with MPS II and to be a necessary premise for prenatal gene diagnosis.展开更多
Objective: To identify the mutations of iduronate-2-sulfatase (IDS) gene, to reveal its mutation features, and to establish a basis for genetic counseling and prenatal gene diagnosis of Hunter syndrome. Methods: Urine...Objective: To identify the mutations of iduronate-2-sulfatase (IDS) gene, to reveal its mutation features, and to establish a basis for genetic counseling and prenatal gene diagnosis of Hunter syndrome. Methods: Urine glycosaminoglycans (GAGs) assay, PCR and DNA sequencing were performed to detect mutation of IDS gene of the patient and his parents. Results: The result showed that the patient was: DS(++), HS(++), KS(-), CS(-), and that both of his parents were negative. A frame-shift deletion mutation (1062 del 16) was identified in exon 7 of the patient's IDS gene. His parents' genotypes were normal. Conclusion:The patient's mutation was not inherited by his parents but a novel one. The mutation probably altered the primary structure and tertiary structure of IDS enzyme protein remarkably and lowered the activity of IDS enzyme greatly. Therefore it is supposed to be the direct cause of the disorder.展开更多
为了研究粘多糖贮积症Ⅱ型（MPSⅡ）患者发病的分子遗传学机制，采用PCR扩增艾杜糖-2-硫酸酯酶（IDS）基因突变热点区（外显子2、3、5、7、8和9）、DNA测序分析和限制性内切酶图谱分析的方法，对2个粘多糖贮积症Ⅱ型家系进行了遗传突变...为了研究粘多糖贮积症Ⅱ型（MPSⅡ）患者发病的分子遗传学机制，采用PCR扩增艾杜糖-2-硫酸酯酶（IDS）基因突变热点区（外显子2、3、5、7、8和9）、DNA测序分析和限制性内切酶图谱分析的方法，对2个粘多糖贮积症Ⅱ型家系进行了遗传突变分析。结果表明，2个家系患者的IDS基因分别出现IVS6-1g→a和c．1587～1588 ins T2个新突变。前者属于单碱基替换，位于内含子6的3’端剪接位点，导致跨外显子剪接；后者属于插入突变，插入点位于外显子9的cDNA1，587和1，588碱基之间，是迄今为止报道的人类IDS基因插入突变中最接近肽链末端的突变，导致移码突变和转录提前终止。经限制性酶切分析，证实2个家系中的患者母亲是突变基因的携带者，符合该病X染色体隐性遗传的规律。另外，在对随机抽取的50名正常人及另外6名不相关的粘多糖病人的测序分析中，未检测到这2个突变，说明不是多态性。对于筛查所得的2个新突变是否是患者的致病原因，尚需进一步证实。展开更多
目的应用胎儿羊水细胞艾杜糖一2一硫酸酯酶（idumnate-2-sulfatase，IDS）活性测定和基因突变检测的方法，对2例黏多糖病Ⅱ型（mucopolysaccharidosis type Ⅱ，MPSII）高危妊娠孕妇进行产前诊断。方法胎儿羊水细胞培养，测定其IDS活性...目的应用胎儿羊水细胞艾杜糖一2一硫酸酯酶（idumnate-2-sulfatase，IDS）活性测定和基因突变检测的方法，对2例黏多糖病Ⅱ型（mucopolysaccharidosis type Ⅱ，MPSII）高危妊娠孕妇进行产前诊断。方法胎儿羊水细胞培养，测定其IDS活性，并抽取羊水细胞基因组DNA，做胎儿性别鉴定和IDS基因突变检测。结果2例胎儿羊水细胞IDS活性均明显下降，基因测序发现1例男性胎儿为IDS突变半合子，另1例女性胎儿为IDS基因突变携带者。结论胎儿羊水细胞酶活性测定结合基因突变分析是一种准确、可靠、灵敏的MPSⅡ产前诊断方法，可对高危妊娠孕妇作出快速的产前诊断。展开更多
文摘Mucopolysaccharidosis type II is of high ge-netic heterogeneity. PCR-DNA sequencing was used to study the mutation hot spots in the IDS gene of a Chinese MPS II pedigree. A new mutation (1467-A) not yet reported world-wide was detected. This mutation located at 448th codon in the coding region of exon 9 deletes one “A” at the end of 1467 bp (cDNA). The frame-shift mutation makes the peptide chain shorten from amino acids 550 to 459, probably altering the configuration of IDS enzyme protein remarkably and lowering the activation of IDS greatly. Therefore it is sup-posed to be the direct cause of the patient with MPS II and to be a necessary premise for prenatal gene diagnosis.
基金Project partly supported by the Ph.D. Program of the National Edu-cational Committee (No. 2000044)the Chinese Medical Board(2003), China
文摘Objective: To identify the mutations of iduronate-2-sulfatase (IDS) gene, to reveal its mutation features, and to establish a basis for genetic counseling and prenatal gene diagnosis of Hunter syndrome. Methods: Urine glycosaminoglycans (GAGs) assay, PCR and DNA sequencing were performed to detect mutation of IDS gene of the patient and his parents. Results: The result showed that the patient was: DS(++), HS(++), KS(-), CS(-), and that both of his parents were negative. A frame-shift deletion mutation (1062 del 16) was identified in exon 7 of the patient's IDS gene. His parents' genotypes were normal. Conclusion:The patient's mutation was not inherited by his parents but a novel one. The mutation probably altered the primary structure and tertiary structure of IDS enzyme protein remarkably and lowered the activity of IDS enzyme greatly. Therefore it is supposed to be the direct cause of the disorder.
文摘为了研究粘多糖贮积症Ⅱ型（MPSⅡ）患者发病的分子遗传学机制，采用PCR扩增艾杜糖-2-硫酸酯酶（IDS）基因突变热点区（外显子2、3、5、7、8和9）、DNA测序分析和限制性内切酶图谱分析的方法，对2个粘多糖贮积症Ⅱ型家系进行了遗传突变分析。结果表明，2个家系患者的IDS基因分别出现IVS6-1g→a和c．1587～1588 ins T2个新突变。前者属于单碱基替换，位于内含子6的3’端剪接位点，导致跨外显子剪接；后者属于插入突变，插入点位于外显子9的cDNA1，587和1，588碱基之间，是迄今为止报道的人类IDS基因插入突变中最接近肽链末端的突变，导致移码突变和转录提前终止。经限制性酶切分析，证实2个家系中的患者母亲是突变基因的携带者，符合该病X染色体隐性遗传的规律。另外，在对随机抽取的50名正常人及另外6名不相关的粘多糖病人的测序分析中，未检测到这2个突变，说明不是多态性。对于筛查所得的2个新突变是否是患者的致病原因，尚需进一步证实。
文摘目的应用胎儿羊水细胞艾杜糖一2一硫酸酯酶（idumnate-2-sulfatase，IDS）活性测定和基因突变检测的方法，对2例黏多糖病Ⅱ型（mucopolysaccharidosis type Ⅱ，MPSII）高危妊娠孕妇进行产前诊断。方法胎儿羊水细胞培养，测定其IDS活性，并抽取羊水细胞基因组DNA，做胎儿性别鉴定和IDS基因突变检测。结果2例胎儿羊水细胞IDS活性均明显下降，基因测序发现1例男性胎儿为IDS突变半合子，另1例女性胎儿为IDS基因突变携带者。结论胎儿羊水细胞酶活性测定结合基因突变分析是一种准确、可靠、灵敏的MPSⅡ产前诊断方法，可对高危妊娠孕妇作出快速的产前诊断。
