Abstract：
:The 7-year IQ scores (WISC) of 116 white and 143 black nonmalformed twins of known zygosity and placental type were ascertained from the NINCDS Collaborative Perinatal Project (NCPP). The type of chorion and zygosity had no significant effect on the mean IQ or among-pair variation. In white monozygotic twins, however, analysis of variance revealed a significantly greater within-pair mean square for dichorionic twins than monochorionic twins. On the other hand, the white dichorionic monozygotic (MZ) and dizygotic (DZ) within-pair mean squares were quite similar. These findings were not evident in blacks for either of the within-pair comparisons. In addition, estimates of genetic variance were dependent upon MZ chorion type in both races. These data suggest to us that (1) in white twin pairs dichorionic placentas are of greater influence than the similarity or dissimilarity of genomes with regard to intrapair IQ development, and (2) failure to consider chorion type may introduce a serious bias in the interpretation of genetic variance estimates of IQ variability.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Melnick M,Myrianthopoulos NC,Christian JCsubject
Has Abstractpub_date
1978-07-01 00:00:00pages
425-33issue
4eissn
0002-9297issn
1537-6605journal_volume
30pub_type
杂志文章abstract：:The first component of the mitochondrial electron-transport chain is especially complex, consisting of 19 nuclear and seven mitochondrion-encoded subunits. Accordingly, a wide range of clinical manifestations are produced by the various mutations occurring in human populations. In this study, we analyze the subunit st...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1991-06-01 00:00:00
abstract：:Although quantitative trait locus (QTL) associations have been identified for many molecular traits such as gene expression, it remains challenging to distinguish the causal nucleotide from nearby variants. In addition to traditional QTLs by association, allele-specific (AS) QTLs are a powerful measure of cis-regulati...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2019.12.011
更新日期：2020-02-06 00:00:00
abstract：:In this report we describe the use of dystrophin analysis both in the diagnosis of Duchenne muscular dystrophy (DMD) in an aborted fetus and in genetic counseling. Our consultand's initial carrier risk, as based on family history and creatine kinase determinations, was calculated as 0.6%. DNA analysis of her family (a...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1989-09-01 00:00:00
abstract：:The Coffin-Lowry syndrome (CLS) is an X-linked inherited disease of unknown pathogenesis characterized by severe mental retardation, typical facial and digital anomalies, and progressive skeletal deformations. Our previous linkage analysis, based on four pedigrees with the disease, suggested a localization for the CLS...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1992-05-01 00:00:00
abstract：:Potocki-Shaffer syndrome (PSS) is a contiguous gene disorder due to the interstitial deletion of band p11.2 of chromosome 11 and is characterized by multiple exostoses, parietal foramina, intellectual disability (ID), and craniofacial anomalies (CFAs). Despite the identification of individual genes responsible for mul...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2012.05.005
更新日期：2012-07-13 00:00:00
abstract：:Acrodysostosis is a rare autosomal-dominant condition characterized by facial dysostosis, severe brachydactyly with cone-shaped epiphyses, and short stature. Moderate intellectual disability and resistance to multiple hormones might also be present. Recently, a recurrent mutation (c.1102C>T [p.Arg368*]) in PRKAR1A has...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2012.03.003
更新日期：2012-04-06 00:00:00
abstract：:Human neuroblastoma cells often are monosomic for the distal portion of 1p (1p36). We report that the deleted 1p material in cells of neuroblastoma lines is preferentially replaced by material from chromosome 17, resulting from an unbalanced 1;17 translocation. Chromosome 17 often acquires instability, followed by the...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1994-08-01 00:00:00
abstract：:Primary hyperoxaluria (PH) is an autosomal-recessive disorder of endogenous oxalate synthesis characterized by accumulation of calcium oxalate primarily in the kidney. Deficiencies of alanine-glyoxylate aminotransferase (AGT) or glyoxylate reductase (GRHPR) are the two known causes of the disease (PH I and II, respect...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2010.07.023
更新日期：2010-09-10 00:00:00
abstract：:Humans vary >100-fold in their sensitivity to the harmful effects of ultraviolet radiation. The main determinants of sensitivity are melanin pigmentation and less-well-characterized differences in skin inflammation and repair processes. Pigmentation has a high heritability, but susceptibility to cancers of the skin, a...
journal_title：American journal of human genetics
pub_type： 杂志文章,评审
doi：10.1086/425285
更新日期：2004-11-01 00:00:00
abstract：:Historical and genetic evidences suggest that the recently founded population of Antioquia (Colombia) is potentially useful for the genetic mapping of complex traits. This population was established in the 16th-17th centuries through the admixture of Amerinds, Europeans, and Africans and grew in relative isolation unt...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/S0002-9297(07)62956-5
更新日期：2000-11-01 00:00:00
abstract：:The fourth-year medical student elective in clinical genetics has been enhanced by the addition of a problem-solving project. The assignment requires students to pose and answer a practical question about a professionally relevant genetic problem. Exemplary questions and the details of the exercise are given. Six of 1...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1991-08-01 00:00:00
abstract：:Quantitative predictions of rates of Down syndrome offspring as a function of maternal serum alpha-fetoprotein (MSAFP) values and of maternal age were reviewed. Comparisons were made of 35-year-equivalent-risk values by maternal age, that is, MSAFP values (at various maternal ages) that predict the risk (of a Down syn...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1988-08-01 00:00:00
abstract：:Multipoint linkage analysis is a powerful method for mapping a rare disease gene on the human gene map despite limited genotype and pedigree data. However, there is no standard procedure for determining a confidence interval for gene location by using multipoint linkage analysis. A genetic counselor needs to know the ...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1990-07-01 00:00:00
abstract：:VNTR fragment lengths in three databases maintained by the FBI for forensic purposes were partitioned into quantile bins, and tests for independence of the two bins at each of six loci were conducted. Whether independence was declared depended on the number of quantiles used. For a large number of quantile bins, equal...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1993-11-01 00:00:00
abstract：:Heteroplasmy, the existence of multiple mtDNA types within an individual, has been previously detected by using mostly indirect methods and focusing largely on just the hypervariable segments of the control region. Next-generation sequencing technologies should enable studies of heteroplasmy across the entire mtDNA ge...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2010.07.014
更新日期：2010-08-13 00:00:00
abstract：:Diabetes mellitus and neurodegeneration are common diseases for which shared genetic factors are still only partly known. Here, we show that loss of the BiP (immunoglobulin heavy-chain binding protein) co-chaperone DNAJC3 leads to diabetes mellitus and widespread neurodegeneration. We investigated three siblings with ...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2014.10.013
更新日期：2014-12-04 00:00:00
abstract：:To investigate the molecular basis for the distinct neuronopathic phenotypes of Gaucher disease, acid beta-glucosidases expressed from mutant DNAs in Gaucher disease type 2 (acute) and type 3 (subacute) patients were characterized in fibroblasts and with the baculovirus expression system in insect cells. Expression of...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1991-09-01 00:00:00
abstract：:Autism is a heritable but genetically complex disorder characterized by deficits in language and in reciprocal social interactions, combined with repetitive and stereotypic behaviors. As with many genetically complex disorders, numerous genome scans reveal inconsistent results. A genome scan of 345 families from the A...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1086/430278
更新日期：2005-06-01 00:00:00
abstract：:Accurate colorectal cancer (CRC) risk prediction models are critical for identifying individuals at low and high risk of developing CRC, as they can then be offered targeted screening and interventions to address their risks of developing disease (if they are in a high-risk group) and avoid unnecessary screening and i...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2020.07.006
更新日期：2020-09-03 00:00:00
abstract：:Exome sequencing has markedly enhanced the discovery of genes implicated in Mendelian disorders, particularly for individuals in whom a known clinical entity could not be assigned. This has led to the recognition that phenotypic heterogeneity resulting from allelic mutations occurs more commonly than previously apprec...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2017.12.015
更新日期：2018-02-01 00:00:00
abstract：:Mutations in the progressive ankylosis gene (Ank/ANKH) cause surprisingly different skeletal phenotypes in mice and humans. In mice, recessive loss-of-function mutations cause arthritis, ectopic crystal formation, and joint fusion throughout the body. In humans, some dominant mutations cause chondrocalcinosis, an adul...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1086/509881
更新日期：2006-12-01 00:00:00
abstract：:A survey of Wilson disease in Iceland has revealed two large kindreds with affected individuals. We have carried out studies of haplotypes of dinucleotide repeat polymorphisms (CA repeats) flanking the Wilson disease gene. The same mutation, a 7-bp deletion, is present in both families, and the clinical features are s...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1995-05-01 00:00:00
abstract：:Genes comprising the major histocompatibility complex (MHC) play a central role in governing the immune response of vertebrates. A great deal of information has been revealed on the molecular biology and physiology of these loci, but three features-the high polymorphism, tight linkage among the loci, and the nonrandom...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1986-09-01 00:00:00
abstract：:Transthyretin (TTR) (122 Val----Ile), caused by a point mutation which destroys a MaeIII restriction site, is associated with cardiac amyloidosis in black individuals. To estimate the frequency of the MaeIII(-) gene in the black population without overt cardiac disease, DNA from 177 black individuals without amyloidos...
journal_title：American journal of human genetics
pub_type： 杂志文章,评审
doi：
更新日期：1991-07-01 00:00:00
abstract：:EXTL3 regulates the biosynthesis of heparan sulfate (HS), important for both skeletal development and hematopoiesis, through the formation of HS proteoglycans (HSPGs). By whole-exome sequencing, we identified homozygous missense mutations c.1382C>T, c.1537C>T, c.1970A>G, and c.2008T>G in EXTL3 in nine affected individ...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2017.01.013
更新日期：2017-02-02 00:00:00
abstract：:DNA was extracted from the skeletal remains of 62 specimens excavated from the Egyin Gol necropolis, in northern Mongolia. This burial site is linked to the Xiongnu period and was used from the 3rd century b.c. to the 2nd century a.d. Three types of genetic markers were used to determine the genetic relationships betw...
journal_title：American journal of human genetics
pub_type： 历史文章,杂志文章
doi：10.1086/377005
更新日期：2003-08-01 00:00:00
abstract：:Charcot-Marie-Tooth disease is characterized by length-dependent axonal degeneration with distal sensory loss and weakness, deep-tendon-reflex abnormalities, and skeletal deformities. It is caused by mutations in more than 40 genes. We investigated a four-generation family with 23 members affected by the axonal form (...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：10.1016/j.ajhg.2011.07.002
更新日期：2011-08-12 00:00:00
abstract：:Allele-specific replication differences have been observed in imprinted chromosomal regions. We have exploited this characteristic of an imprinted region by using FISH at D15S9 and SNRPN (small nuclear ribonucleo protein N) on interphase nuclei to distinguish between Angelman and Prader-Willi syndrome patient samples ...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1996-08-01 00:00:00
abstract：:The alkaline phosphatases comprise a multigene enzyme family that hydolyze phosphate esters and are widely distributed in nature. Three main classes have been isolated from humans, the placental, intestinal, and liver/bone/kidney forms. We have mapped the placental and intestinal alkaline phosphatase genes to 2q34-q37...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1987-12-01 00:00:00
abstract：:The original test for the analysis of the CCG expansion at the FRAXE locus involves Southern blot analysis of HindIII digests. We show that, by using a different probe, the FRAXE mutation can be detected easily on the same EcoRI or EagI+EcoRI blots as are used for detection of FRAXA. Unexpectedly, we found that both t...
journal_title：American journal of human genetics
pub_type： 杂志文章
doi：
更新日期：1996-10-01 00:00:00
