用长距离PCR技术检测江西籍重型血友病甲Ⅷ因子基因倒位基因

目的用长距离PCR（LD-PCR）技术检测江西籍重型血友病A（hemophiliaA,HA）有无Ⅷ因子基因倒位。方法用Bigg′s一期法检测血浆凝血因子FⅧ活性（FⅧ：C）,LD-PCR方法,以0.6%琼脂糖凝胶电泳技术,检测55例江西籍重型HA进行凝血因子Ⅷ（FⅧ）倒位基因,电泳出现11kb带,示FⅧ基因倒位;12kb带,示非FⅧ倒位,这两条带同时出现者为FⅧ倒位基因携带者。结果检测30例无亲缘关系的重型HA患者中,发现11例患者（或家属成员）有FⅧ倒位基因,占重型HA患者的36.7%;9家系中查出基因倒位携带者4名。结论LD-PCR技术结合血浆FⅧ：C可快速、准确检测重型血友病FⅧ基因倒位。     

应用PCR／RFLPs对甲型血友病携带者的诊断

应用ＰＣＲ／ＲＦＬＰｓ对甲型血友病携带者的诊断石奇珍，吕联煌，张学敏甲型血友病是一种最常见的Ｘ连锁隐性遗传性出血性疾病，是由凝血因子Ⅷ基因缺陷所致［１］。发病几乎全为男性，女性为携带者，其诊断可通过测定ＦⅧ组分进行判断，但有一定误诊率［２］。我们应用...     

F8基因倒位检测及其在甲型血友病基因诊断中的应用

目的建立F8基因第22内含子倒位突变检测新方法,应用于甲型血友病(hemophilia A)基因诊断。方法应用长距离PCR(long distance-polymerase chain reaction,LD-PCR)、倒位PCR(inversion-PCR,IPCR)技术检测31例甲型血友病患者F8基因22内含子倒位;对于倒位突变阳性患者的母亲应用上述两种方法进行携带者诊断;而对倒位携带者孕妇于孕中期抽取羊水,进行产前基因诊断。结果31例甲型血友病患者中查出7例存在倒位突变;4例倒位突变阳性患者的母亲有3例为倒位携带者;对1例倒位携带者孕妇进行了产前诊断,确定其胎儿无倒位突变。结论LD-PCR、I-PCR技术可快速检测F8基因22内含子倒位突变,可应用于患者及携带者基因诊断;I-PCR可用于F8基因22内含子倒位的产前基因诊断。     

血友病A基因诊断和产前诊断技术的研究进展

血友病A是由于凝血因子Ⅷ缺乏所致的X连锁隐性遗传的凝血缺陷疾病，是最常见的遗传性出血性疾病。该病目前尚无有效根治方法，因此应开展血友病A家系基因诊断，并对患者家系成员做好产前诊断，以避免新的患者或携带者出生，降低血友病A的发病率，这对开展遗传咨询和优生优育服务大有益处。本文拟简要阐述近年来血友病A基因诊断与产前诊断的研究进展。     

PCR-构象敏感凝胶电泳技术在血友病A基因分型诊断及携带者检测中的应用

所有的HA家系(含散发)进行直接基因诊断,理论上可筛查新突变并明确其突变类型.该法简便、快速、成本低,在HA直接基因诊断及携带者筛查中优势独特,应具重要应用价值.     

甲型血友病基因诊断及产前诊断的研究进展

甲型血友病是最常见的遗传性出血性疾病,受到了国内外研究者们的极大关注。由于此病尚无彻底根治方法,所以基因诊断及产前诊断显得尤为重要。基因诊断可分为直接基因诊断及间接连锁分析的方法。产前诊断的手段也在近年飞速发展。本文将就直接基因诊断、间接连锁分析及产前诊断新技术这几方面的研究进展综述如下。     

血友病A基因治疗载体研究现状

血友病A是X染色体隐性遗传出血性疾病.其发病原因是患者血液中先天缺乏凝血因子F Ⅷ.用于血友病A基因治疗研究的载体有病毒载体和非病毒载体,目前研究较多的是病毒载体,主要有逆转录病毒载体和慢病毒载体,腺病毒载体及腺相关病毒载体等.非病毒载体主要有质粒、脂质体、转座子等.文章拟对血友病A基因治疗各载体的特点和研究进展作一综...     

甲型血友病基因诊断及产前诊断的研究进展

甲型血友病是最常见的遗传性出血性疾病,受到了国内外研究者们的极大关注.由于此病尚无彻底根治方法,所以基因诊断及产前诊断显得尤为重要.基因诊断可分为直接基因诊断及间接连锁分析的方法;产前诊断的手段也在近年飞速发展.本文就直接基因诊断、间接连锁分析及产前诊断新技术这几方面的研究进展综述如下.     

甲型血友病基因诊断及产前诊断的研究进展

甲型血友病是最常见的遗传性出血性疾病,受到了国内外研究者们的极大关注.由于此病尚无彻底根治方法,所以基因诊断及产前诊断显得尤为重要.基因诊断可分为直接基因诊断及间接连锁分析的方法;产前诊断的手段也在近年飞速发展.本文就直接基因诊断、间接连锁分析及产前诊断新技术这几方面的研究进展综述如下.     

甲型血友病基因诊断及产前诊断的研究进展

甲型血友病是最常见的遗传性出血性疾病,受到了国内外研究者们的极大关注.由于此病尚无彻底根治方法,所以基因诊断及产前诊断显得尤为重要.基因诊断可分为直接基因诊断及间接连锁分析的方法;产前诊断的手段也在近年飞速发展.本文就直接基因诊断、间接连锁分析及产前诊断新技术这几方面的研究进展综述如下.     

A case of prenatal diagnosis of hemophilia A.

Classic hemophilia, (hemophilia A), is an X-linked hereditary bleeding disorder affecting half of the male offspring of female carriers. Prenatal diagnosis offers an option, namely to restrict abortions to hemophilic fetuses only, and thus retain the chance of bearing normal sons. Recently, the authors have made a prenatal diagnosis of hemophilia A in an obligate carrier with a male fetus at 24 weeks of gestation by pure fetal sampling and accurate factor VIII coagulant assay, which was repeatedly less than 1% at 28 weeks of gestation.     

Genetic heterogeneity in X-linked agammaglobulinemia complicates carrier detection and prenatal diagnosis

X-linked agammaglobulinemia (XLA) is a severe antibody deficiency disease reflecting an arrest of B lymphocyte differentiation at the level of precursor B cells. The disease is inherited in an X-linked recessive mode. In a single eight-generation pedigree the XLA gene was mapped to the Xq21.3-Xq22 area of the X chromosome. The data establish close linkage of the XLA locus to the DXS17 restriction fragment length polymorphic (RFLP) marker locus (the lod score exceeding 6 at phi = 0). A series of RFLP markers around the DXS17 locus provided an RFLP haplotype of use in genetic counselling within this pedigree. In one other pedigree a phenotypically identical disease was inherited but was accompanied by a high frequency of recombination with the DXS17 locus, which made localisation of the gene at the DXS17 locus highly unlikely (lod score less than -3). This genetic heterogeneity complicates genetic counselling within particular pedigrees, especially when the localization of the XLA gene involved in those pedigrees has not been established.     

Haemophilia A: carrier detection and prenatal diagnosis by linkage analysis using DNA polymorphism.

Restriction fragment length polymorphisms (RFLPs) within or close to the factor VIII locus are very useful for genetic linkage analysis. Such RFLPs allow a mutant allele to be tracked in a family, segregating haemophilia A even when, as is usually the case, the precise mutation causing failure to synthesise factor VIII is unknown. To date two markers tightly linked to the factor VIII locus have been described, one of which is highly polymorphic and therefore informative in most kindreds. A significant crossover rate, however, does not make diagnosis absolute. Three intragenic RFLPs have been defined, which, taken together, are informative in about 70% of women, providing virtually deterministic genetic diagnosis.     

Norrie disease caused by a gene deletion allowing carrier detection and prenatal diagnosis

Carrier determination and prenatal diagnosis in Norrie disease (ND) has so far not been reported. We describe a kindred with 4 members affected by ND in which a deletion comprising gene locus DXS7 on the short arm of the X chromosome defined by probe L1.28 causes the disorder. This allowed us to predict via chorion villus biopsy that a male foetus of a carrier woman is unaffected.     

Feasibility of DNA based methods for prenatal diagnosis and carrier detection of propionic acidaemia

Propionic acidaemia (PA) is an autosomal recessive disease caused by a genetic deficiency of propionyl-CoA carboxylase (PCC). Defects in the PCCA and PCCB genes that code for the alpha and beta subunits of PCC, respectively, are responsible for PA. A proband with PA was previously shown to carry the c1170insT mutation and the private L519P mutation in the PCCB gene. Here we report the prenatal diagnosis of an affected fetus based on DNA analysis in chorionic villus tissue. We have also assessed the carrier status in this PCCB deficient family, which was not possible with biochemical analysis.     

An improved method for prenatal diagnosis of genetic diseases by analysis of amplified DNA sequences. Application to hemophilia A

We report the development of a rapid nonradioactive technique for the genetic prediction of human disease and its diagnostic application to hemophilia A. This method is based on enzymatic amplification of short segments of human genes associated with inherited disorders. A novel feature of the procedure is the use of a heat-stable DNA polymerase, which allows the repeated rounds of DNA synthesis to proceed at 63 degrees C. The high sequence specificity of the amplification reaction at this elevated temperature permits restriction-site polymorphisms, contained in the amplified samples, to be analyzed by visual inspection of their digestion products on polyacrylamide gels. By means of this method, we have performed carrier detection and prenatal diagnosis of hemophilia in two families with use of the factor VIII intragenic polymorphisms identified by the restriction enzymes BclI and XbaI. Predictions can be made directly from chorionic villi, without previous DNA extraction, and fetal sex can be determined by amplification of sequences specific for the Y chromosome. Specific amplification of genomic sequences with heat-stable DNA polymerase is applicable to the diagnosis of a wide variety of inherited disorders. These include diseases diagnosed by restriction-site variation, such as Duchenne's muscular dystrophy and sickle cell anemia, those due to a collection of known mutations, such as beta-thalassemia, and those due to gene deletion, such as alpha-thalassemia.     

血友病甲基因分析技术的改进及其在产前诊断中的应用

目的对血友病甲基因分析技术进行改进并应用于携带者检查和产前诊断。方法长距离聚合酶链反应方法直接检测凝血因子Ⅷ第22内含子倒位,对非倒位家系用FⅧ基因内限制酶切位点XbaⅠ、HindⅢ、二核苷酸重复序列多态性位点STR13和STR22,以及基因外可变数目串联重复序列DXS52(St14)位点进行基因连锁分析。结果52个家系共检出71位携带者。21个家系为第22内含子倒位,28个家系经连锁分析得到明确诊断,3个家系无法诊断,可诊断家系占94.2%。为18个家系做胎儿产前诊断,其中10例诊断为血友病甲胎儿;诊断7例正常男胎和1例携带者女胎,随访1年发育正常。结论应用长距离聚合酶链反应和多位点基因连锁分析技术可以快速有效地进行血友病甲携带者检查和产前诊断。