Abstract:
:The 22q11 region is involved in chromosomal rearrangements that lead to altered gene dosage, resulting in genomic disorders that are characterized by mental retardation and/or congenital malformations. Three such disorders-cat-eye syndrome (CES), der(22) syndrome, and velocardiofacial syndrome/DiGeorge syndrome (VCFS/DGS)-are associated with four, three, and one dose, respectively, of parts of 22q11. The critical region for CES lies centromeric to the deletion region of VCFS/DGS, although, in some cases, the extra material in CES extends across the VCFS/DGS region. The der(22) syndrome region overlaps both the CES region and the VCFS/DGS region. Molecular approaches have revealed a set of common chromosome breakpoints that are shared between the three disorders, implicating specific mechanisms that cause these rearrangements. Most VCFS/DGS and CES rearrangements are likely to occur by homologous recombination events between blocks of low-copy repeats (e.g., LCR22), whereas nonhomologous recombination mechanisms lead to the constitutional t(11;22) translocation. Meiotic nondisjunction events in carriers of the t(11;22) translocation can then lead to offspring with der(22) syndrome. The molecular basis of the clinical phenotype of these genomic disorders has also begun to be addressed. Analysis of both the genomic sequence for the 22q11 interval and the orthologous regions in the mouse has identified >24 genes that are shared between VCFS/DGS and der(22) syndrome and has identified 14 putative genes that are shared between CES and der(22) syndrome. The ability to manipulate the mouse genome aids in the identification of candidate genes in these three syndromes. Research on genomic disorders on 22q11 will continue to expand our knowledge of the mechanisms of chromosomal rearrangements and the molecular basis of their phenotypic consequences.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
McDermid HE,Morrow BEdoi
10.1086/340363subject
Has Abstractpub_date
2002-05-01 00:00:00pages
1077-88issue
5eissn
0002-9297issn
1537-6605pii
S0002-9297(07)62504-Xjournal_volume
70pub_type
杂志文章,评审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::Charcot-Marie-Tooth disease type 2D (CMT2D) and distal spinal muscular atrophy type V (dSMA-V) are axonal peripheral neuropathies inherited in an autosomal dominant fashion. Our previous genetic and physical mapping efforts localized the responsible gene(s) to a well-defined region on human chromosome 7p. Here, we rep...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/375039
更新日期:2003-05-01 00:00:00
abstract::Although recent studies provide evidence for a common genetic basis between complex traits and Mendelian disorders, a thorough quantification of their overlap in a phenotype-specific manner remains elusive. Here, we have quantified the overlap of genes identified through large-scale genome-wide association studies (GW...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1016/j.ajhg.2018.08.017
更新日期:2018-10-04 00:00:00
abstract::Central core disease (CCO) is an autosomal dominant myopathy clinically distinct from malignant hyperthermia (MHS). In a large kindred in which the gene for CCO is segregating, two-point linkage analysis gave a maximum lod score, between the central core disease locus (CCO) and the ryanodine receptor locus (RYR1), of ...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1993-02-01 00:00:00
abstract::Protoporphyria is an autosomal dominant disease in man in which protoporphyrin accumulated because of a defect in heme synthase (ferrochelatase) activity. A disease has been described in cattle that has the same manifestations as does the human disease. We measured heme synthase activity in sonicates of cultured skin ...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1982-03-01 00:00:00
abstract::A total of 254 affected parent-child pairs with Huntington disease (HD) and 440 parent-child pairs with CAG size in the normal range were assessed to determine the nature and frequency of intergenerational CAG changes in the HD gene. Intergenerational CAG changes are extremely rare (3/440 [0.68%]) on normal chromosome...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1995-08-01 00:00:00
abstract::We recently identified a mutation in the I-kappa B kinase associated protein (IKBKAP) gene as the major cause of familial dysautonomia (FD), a recessive sensory and autonomic neuropathy. This alteration, located at base pair 6 of the intron 20 donor splice site, is present on >99.5% of FD chromosomes and results in ti...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/368263
更新日期:2003-03-01 00:00:00
abstract::Animal microRNAs (miRNAs) regulate gene expression through base pairing to their targets within the 3' untranslated region (UTR) of protein-coding genes. Single-nucleotide polymorphisms (SNPs) located within such target sites can affect miRNA regulation. We mapped annotated SNPs onto a collection of experimentally sup...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/519979
更新日期:2007-08-01 00:00:00
abstract::To test hypotheses about the origin of modern humans, we analyzed mtDNA sequences, 30 nuclear restriction-site polymorphisms (RSPs), and 30 tetranucleotide short tandem repeat (STR) polymorphisms in 243 Africans, Asians, and Europeans. An evolutionary tree based on mtDNA displays deep African branches, indicating grea...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1002/ajmg.1320570340
更新日期:1995-09-01 00:00:00
abstract::Down syndrome is a complex genetic and metabolic disorder attributed to the presence of three copies of chromosome 21. The extra chromosome derives from the mother in 93% of cases and is due to abnormal chromosome segregation during meiosis (nondisjunction). Except for advanced age at conception, maternal risk factors...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/303055
更新日期:2000-09-01 00:00:00
abstract::The central challenges in tumor sequencing studies is to identify driver genes and pathways, investigate their functional relationships, and nominate drug targets. The efficiency of these analyses, particularly for infrequently mutated genes, is compromised when subjects carry different combinations of driver mutation...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1016/j.ajhg.2015.12.021
更新日期:2016-03-03 00:00:00
abstract::The microsatellite marker DXS426 maps to the interval Xp21.1-Xp11.21, the chromosomal region which contains two loci for X-linked retinitis pigmentosa (XLRP; RP2 and RP3). We have refined the localization of DXS426 both physically, by mapping it to a deletion which spans the interval Xp21.3-Xp11.23, and genetically, b...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1990-12-01 00:00:00
abstract::Linkage is a phenomenon that correlates the genotypes of loci, rather than the phenotypes of one locus to the genotypes of another. It is therefore necessary to convert the observed trait phenotypes into trait-locus genotypes, which can then be analyzed for coinheritance with marker-locus genotypes. However, if the mo...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/302797
更新日期:2000-03-01 00:00:00
abstract::We conducted a genomewide linkage screen of a simple heavy-smoking quantitative trait, the maximum number of cigarettes smoked in a 24-h period, using two independent samples: 289 Australian and 155 Finnish nuclear multiplex families, all of which were of European ancestry and were targeted for DNA analysis by use of ...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/513703
更新日期:2007-05-01 00:00:00
abstract::Risk prediction based on genomic profiles has raised a lot of attention recently. However, family history is usually ignored in genetic risk prediction. In this study we proposed a statistical framework for risk prediction given an individual's genotype profile and family history. Genotype information about the relati...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1016/j.ajhg.2011.04.001
更新日期:2011-05-13 00:00:00
abstract::The definition of haplotype blocks of single-nucleotide polymorphisms (SNPs) has been proposed so that the haplotypes can be used as markers in association studies and to efficiently describe human genetic variation. The International Haplotype Map (HapMap) project to construct a comprehensive catalog of haplotypic va...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/498175
更新日期:2005-12-01 00:00:00
abstract::We have demonstrated that human lymphocytes can respond to the synthetic polypeptide GLPhe upon in vitro challenge by the antigen similar to that of (H,G)-A--L, (T,G)-A--L, (Phe,G)-A--L, and GAT. Family studies further support our postulation that responses to these synthetic polymers are under dual gene control. Thre...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1985-05-01 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::Cancer occurrence in 164 families with breast/ovarian cancer and germline BRCA2 mutations was studied to evaluate the evidence for genotype-phenotype correlations. Mutations in a central portion of the gene (the "ovarian cancer cluster region" [OCCR]) were associated with a significantly higher ratio of cases of ovari...
journal_title:American journal of human genetics
pub_type: 杂志文章,多中心研究
doi:10.1086/318181
更新日期:2001-02-01 00:00:00
abstract::The MID1 gene in Xp22 codes for a novel member of proteins containing a RING finger, B-box, coiled-coil and a conserved C-terminal domain. Initially, three mutations in the C-terminal region were found in patients with Opitz G/BBB syndrome, a defect of midline development. Here we have determined the complete gene str...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/302010
更新日期:1998-09-01 00:00:00
abstract::Several dysmorphic syndromes affect the development of both the eye and the ear, but only a few are restricted to the eye and the external ear. We describe a developmental defect affecting the eye and the external ear in three members of a consanguineous family. This syndrome is characterized by ophthalmic anomalies (...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1016/j.ajhg.2008.03.007
更新日期:2008-05-01 00:00:00
abstract::Plasma DNA fragmentomics is an emerging area in cell-free DNA diagnostics and research. In murine models, it has been shown that the extracellular DNase, DNASE1L3, plays a role in the fragmentation of plasma DNA. In humans, DNASE1L3 deficiency causes familial monogenic systemic lupus erythematosus with childhood onset...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1016/j.ajhg.2020.09.006
更新日期:2020-11-05 00:00:00
abstract::Huntington disease (HD) is a common autosomal dominant neurodegenerative disease with early adult-onset motor abnormalities and dementia. Many studies of HD show that huntingtin (CAG)n repeat-expansion length is a sensitive and specific marker for HD. However, there are a significant number of examples of HD in the ab...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/324414
更新日期:2001-12-01 00:00:00
abstract::Syndromic diarrhea (or trichohepatoenteric syndrome) is a rare congenital bowel disorder characterized by intractable diarrhea and woolly hair, and it has recently been associated with mutations in TTC37. Although databases report TTC37 as being the human ortholog of Ski3p, one of the yeast Ski-complex cofactors, this...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1016/j.ajhg.2012.02.009
更新日期:2012-04-06 00:00:00
abstract::Treacher Collins syndrome (TCS) is an autosomal dominant disorder of craniofacial development, the features of which include conductive hearing loss and cleft palate. The TCS locus has been mapped to human chromosome 5q31.3-32 and the mutated gene identified. In the current investigation, 25 previously undescribed mut...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1997-03-01 00:00:00
abstract::Lysinuric protein intolerance (LPI) is an autosomal recessive disease characterized by defective transport of cationic amino acids and by hyperammonemia. Linkage analysis in 20 Finnish LPI families assigned the LPI gene locus to the proximal long arm of chromosome 14. Recombinations placed the locus between framework ...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/515457
更新日期:1997-06-01 00:00:00
abstract::Adolescent idiopathic scoliosis (AIS) is one of the most common orthopedic disorders, affecting up to 4% of schoolchildren worldwide. We studied seven unrelated multiplex families of southern Chinese descent with AIS, consisting of 25 affected members. A genomewide scan with >400 fluorescent microsatellite markers was...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:10.1086/341607
更新日期:2002-08-01 00:00:00
abstract::Age at onset of motor symptoms was collected on 611 persons affected with Huntington disease (HD) among 3,201 persons "at risk" in 108 kindreds. Life-table estimates correcting for truncated intervals of observation (censoring) produced a median age at onset 5 years older than the observed mean. Risk estimates of HD o...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1988-11-01 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::Treacher Collins syndrome (TCOF1) is an autosomal dominant disorder of craniofacial development, the features of which include conductive hearing loss and cleft palate. The TCOF1 locus has been localized to chromosome 5q32-33.2. In the present study we have used the combined techniques of genetic linkage analysis and ...
journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
更新日期:1993-05-01 00:00:00