Abstract:
:Ganglioside GM2 and its asialo-derivative, GA2 were radiolabeled in their N-acetyl-D-galactosaminyl moieties by oxidation with galactose oxidase and reduction with tritiated sodium borohydride. Specific activities of 6 X 10(4) dpm/nmol (GM2) and 1.8 X 10(6) dpm/nmol (GA2) were achieved. About 98% of the label was in N-acetyl-D-galactosamine. Using these substrates, an assay was developed for GM2-N-acetyl-beta-D-galactosaminidase (E.C.3.2.1.30) and GA2-N-acetyl-beta-D-galactosaminidase (E.C.3.2.1.30) activities in human cultured skin fibroblasts. The products of the GM2 cleaving reaction were identified as N-acetylgalactosamine and ganglioside GM3. Both GM2 and GA2 cleaving activities were stimulated about 5-fold by purified sodium taurocholate, and this stimulation was inhibited by neutral detergents, lipids and albumin at low concentrations. Addition of various salts, reducing agents and a protein activator factor from human liver of Li et al. (1973) did not stimulate GM2-N-acetyl-beta-D-galactosaminidase activity beyond that found with sodium taurocholate. Under optimal conditions, control fibroblast supernates cleaved ganglioside GM2 at a rate of 3.7 nmol/mg protein/h compared to 1100 for GA2-N-acetyl-beta-D-galactosaminidase and 4700 for 4-methylumbelliferyl-N-acetyl-beta-D-glucosaminidase. Supernates from two patients with Tay-Sachs disease had markedly reduced activity levels for GM2-N-acetyl-beta-D-galactosaminidase but not for the other two substrates. Supernates from two patients with Sandhoff's disease had reduced activities for all three substrates. A supernate from one patient with juvenile GM2 gangliosidosis cleaved GM2 at a somewhat faster rate than those from Tay-Sachs or Sandhoff's patients. Two healthy adult women with markedly reduced hexosaminidase A activities using 4MU-N-acetyl-beta-D-glucosaminide as substrate had approximately half-normal activities using GM2 as substrate. A patient with the Tay-Sachs phenotype but with a partial deficiency of hexosaminidase A using the 4-MU substrate had a profound deficiency using GM2 as substrate. In such unusual hexosaminidase mutants, assays using GM2 as substrate are better indicators of phenotype than those using synthetic substrates.
journal_name
Clin Genetjournal_title
Clinical geneticsauthors
O'Brien JS,Norden GW,Miller AL,Frost RG,Kelly TEdoi
10.1111/j.1399-0004.1977.tb01296.xsubject
Has Abstractpub_date
1977-03-01 00:00:00pages
171-83issue
3eissn
0009-9163issn
1399-0004journal_volume
11pub_type
杂志文章abstract::Second trimester amniotic fluid samples obtained transabdominally for genetic analysis not infrequently are contaminated with blood. There has been disagreement as to whether blood contamination interferes with the efficiency of culture of amniotic fluid cells for genetic diagnosis. A procedure using ammonium chloride...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:
更新日期:1979-03-01 00:00:00
abstract::Mutation of SLC26A4 is the most common cause of prelingual hearing loss in East Asia. Patients with SLC26A4 mutations have variable phenotypes ranging from non-syndromic hearing loss to Pendred syndrome. Here, we analyzed the correlation between genotype and various inner ear phenotypes and found a possible underlying...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/cge.12273
更新日期:2014-09-01 00:00:00
abstract::A large 15p + chromosome with a whole heterochromatic short arm has been studied by means of different banding techniques in six of nine individuals of a family; a possible Y/15 translocation has been excluded. Furthermore a heteromorphic pair 9 has been observed in seven family members, representing a "possible" smal...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1984.tb04368.x
更新日期:1984-09-01 00:00:00
abstract::It has been reported that the frequency of congenital heart defects (CHD) in children of an affected parent is now three to five times what it was 20 years ago. One conceivable cause of this is that patients with CHD of a severity that would have precluded parenthood before the advent of treatment are now able to (and...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1987.tb03345.x
更新日期:1987-09-01 00:00:00
abstract::Several genes involved in the familial appearance of thoracic aortic aneurysms and dissections (FTAAD) have been characterized recently, one of which is SMAD3. Mutations of SMAD3 cause a new syndromic form of aortic aneurysms and dissections associated with skeletal abnormalities. We discovered a small interstitial de...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.2012.01931.x
更新日期:2013-04-01 00:00:00
abstract::We describe a 2-year-old female patient who had megaloblastic anaemia caused by selective vitamin B12 malabsorption (Imerslund-Grasbeck syndrome) and del(21)(q22). To our knowledge, this is the first observation of Imerslund-Grasbeck syndrome associated with del(21)(q22) in the literature. ...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1996.tb02637.x
更新日期:1996-10-01 00:00:00
abstract::Three overlapping conditions, namely Rothmund-Thomson (RTS), Baller-Gerold (BGS) and RAPADILINO syndromes, have been attributed to RECQL4 mutations. Differential diagnoses depend on the clinical presentation, but the numbers of known genes remain low, leading to the widespread prescription of RECQL4 sequencing. The ai...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/cge.12361
更新日期:2015-03-01 00:00:00
abstract::Failure to thrive (FTT) causes significant morbidity, often without clear etiologies. Six individuals of a large consanguineous family presented in the neonatal period with recurrent vomiting and diarrhea, leading to severe FTT. Standard diagnostic work up did not ascertain an etiology. Autozygosity mapping and whole ...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/cge.13883
更新日期:2020-11-15 00:00:00
abstract::Biallelic pathogenic variants in CA8 cause cerebellar ataxia, mental retardation and dysequilibrium syndrome 3 (CAMRQ3), a rare form of hereditary ataxia characterised by cerebellar hypoplasia/atrophy, variable intellectual disability and often quadrupedal gait. The few cases reported in the medical literature are all...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/cge.13666
更新日期:2020-03-01 00:00:00
abstract::Biochemical data are presented of a 29-year-old male, who shows progressive psychomotor retardation and a beta-galactosidase deficiency in leucocytes and cultured skin fibroblasts. Somatic cell hybridization studies show that this variant of GM1-gangliosidosis is based on a different gene mutation than is present in t...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1976.tb02272.x
更新日期:1976-04-01 00:00:00
abstract::Pallister Killian syndrome (PKS) is the most frequent form of partial autosomal tetrasomy 12p in humans. Sufferers have a mosaic of isochromosome 12p [i(12p)]. We report the first pre-natal diagnosis on fetal blood cells after cordocentesis during the second trimester. The extra chromosome was first diagnosed by in si...
journal_title:Clinical genetics
pub_type: 杂志文章,评审
doi:10.1034/j.1399-0004.1998.5440406.x
更新日期:1998-10-01 00:00:00
abstract::The effects of apolipoprotein (apo) A-IV genotype on serum glucose, total cholesterol, low density lipoprotein (LDL) cholesterol, high density lipoprotein (HDL) cholesterol, triglyceride and glucose concentrations were ascertained in a population of 373 men and 361 women with a mean age of about 57 years. Subjects wer...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1034/j.1399-0004.2002.610606.x
更新日期:2002-06-01 00:00:00
abstract::The concept of personality disorders is based on deviant personality traits in both the DSM-III-R and ICD-10 classifications. A diagnosis of personality disorder can be made reliably with structured interviews. Many individuals are diagnosed with more than one personality disorder, and other mental disorders are often...
journal_title:Clinical genetics
pub_type: 杂志文章,评审
doi:10.1111/j.1399-0004.1994.tb04215.x
更新日期:1994-07-01 00:00:00
abstract::The presence of Y chromosome sequences in Turner syndrome (TS) patients may predispose them to gonadoblastoma formation with an estimated risk of 15-25%. The aim of this study was to determine the presence and the incidence of cryptic Y chromosome material in the genome of TS patients. The methodology involved a combi...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1998.tb02691.x
更新日期:1998-04-01 00:00:00
abstract::Myotonic dystrophy (MD) is an autosomal dominant disorder that has a high prevalence in Saguenay-Lac-St-Jean. A case-control study, based on a population register, of 373 MD patients who married in this region between 1855 and 1971 was conducted to determine whether their fertility was affected by the disorder. Six de...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1992.tb03247.x
更新日期:1992-11-01 00:00:00
abstract::The potential causes for the incomplete penetrance of Pelizaeus-Merzbacher disease (PMD) in female carriers of PLP1 mutations are not well understood. We present a family with a boy having PMD in association with PLP1 duplication and three females who are apparent manifesting carriers. Custom high-resolution oligonucl...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.2011.01716.x
更新日期:2012-06-01 00:00:00
abstract::Lipoprotein(a) [Lp(a)] is an important genetic trait associated with cardiovascular disease. While Lp(a) levels have been demonstrated to be approximately twice as high in black adults and children compared with whites, this relationship has not been assessed in the elderly. During the 1987 recall of the Charleston He...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1993.tb03887.x
更新日期:1993-11-01 00:00:00
abstract::We report the analysis of altogether 1050 suspected hereditary breast/ovarian cancer (HBOC) families, 524 fully screened for BRCA1/BRCA2 mutations and 526 tested only for the most common mutations. Of the 119 families with pathogenic mutations, 40 (33.6%) had the BRCA2 c.156_157insAlu rearrangement and 15 (12.6%) the ...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/cge.12441
更新日期:2015-07-01 00:00:00
abstract::X-linked mental retardation (MR) associated with a fragile X chromosome was found in two Swedish families. The fragile X chromosome was demonstrated in 5/5 boys with mental retardation. Clinical data on four of these boys are presented. In one of the families, the mental retardation was associated with macro-orchidism...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1981.tb00678.x
更新日期:1981-02-01 00:00:00
abstract::A de novo 14/21 Robertsonian translocation and a familially inherited Y/15 translocation were observed in a male infant with anomalies of the external genitalia. The Y/15 translocation was confirmed by cultivating lymphocytes in a medium containing distamycin A and by determining the occurrence of the Y-specific DNA s...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1983.tb00076.x
更新日期:1983-10-01 00:00:00
abstract::Successful fertilization is fundamental for sexual reproduction. After undergoing a series of molecular and morphological changes, the haploid sperm fuses with the haploid oocyte to create a diploid zygote. Defects in this process might lead to human fertilization failure. We have previously found homozygous mutations...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/cge.13505
更新日期:2019-04-01 00:00:00
abstract::Germline mutations in succinate dehydrogenase B (SDHB) predispose to hereditary paraganglioma (PGL) syndrome type 4. The risk of developing PGL or pheochromocytoma (PHEO) in SDHB mutation carriers is subject of recent debate. In the present nationwide cohort study of SDHB mutation carriers identified by the clinical g...
journal_title:Clinical genetics
pub_type: 杂志文章,多中心研究
doi:10.1111/cge.13055
更新日期:2018-01-01 00:00:00
abstract::A dysmorphic child was found by cytogenetic analysis to have an extra small marker chromosome. The marker chromosome was shown to possess a chromosome 18 centromere by in situ hybridization, and probably represents an isochromosome 18p. Centromere specific probes should be of value in identifying extra small marker ch...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1991.tb03054.x
更新日期:1991-06-01 00:00:00
abstract::A study of 73 patients with the Sanfilippo syndrome (36 patients with Sanfilippo A disease, 23 with Sanfilippo B disease and 14 with Sanfilippo C disease) revealed both intertype and intratype variability. The course of the disease was relatively mild in Sanfilippo B disease and dementia was less severe. Type A showed...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1981.tb01821.x
更新日期:1981-08-01 00:00:00
abstract::Atypical or variant forms of well-known chondrodysplasias may pose diagnostic problems. We report on a girl with clinical features suggesting diastrophic dysplasia but with unusual radiographic features including severe platyspondyly, wide metaphyses, and fibular overgrowth, which are partially reminiscent of metatrop...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1034/j.1399-0004.1999.560110.x
更新日期:1999-07-01 00:00:00
abstract::The life-span of Menkes syndrome patients is discussed in connection with a boy suffering from this disease who lived to the age of 13.5 years. The copper metabolism defect is described. Therapeutic trials, mainly copper substitution, and prospects are summed up. ...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1988.tb03441.x
更新日期:1988-03-01 00:00:00
abstract::Hobbs et al. (N. Engl. J. Med. 317: 734-737, 1987) reported a large deletion of approximately 10 kilobases in the 5' portion of the human low-density lipoprotein (LDL) receptor gene. This deletion affects about 60% of familial hypercholesterolemia (FH) heterozygotes in the French Canadian population. We have developed...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1989.tb03194.x
更新日期:1989-10-01 00:00:00
abstract::This report compares the pathogenetic influences of selective deletion and triplicaton of chromosome 13 derived from a familial 12;13 insertional translocation. In the proband a heritable chromosomal basis for his bilateral retinoblastomas is established [46,XY,del (13) (pter leads to q12.5: :q22.1 leads to qter)mat],...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1979.tb01743.x
更新日期:1979-04-01 00:00:00
abstract::The nitric oxide synthase (NOS) gene is thought to be associated with essential hypertension (EH), because NO is implicated in endothelium-mediated vasodilation. We investigated the possible association between the alleles of simple tandem repeat DNA polymorphism of the endothelial constitutive NOS (cNOS) gene and EH ...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1997.tb02409.x
更新日期:1997-01-01 00:00:00
abstract::In a country-wide screening examination in Sweden, PKU was observed in 75 (4.5 per 1,000) and hyperphenylalaninemia in 14 (0.8 per 1,000) of a total of 16,805 patients in institutions for the mentally retarded. In the national neonatal screening program in 1965-1975, which covered nearly 1 million individuals, PKU was...
journal_title:Clinical genetics
pub_type: 杂志文章
doi:10.1111/j.1399-0004.1976.tb00054.x
更新日期:1976-12-01 00:00:00