Abstract:
:A total of 592 cells was examined from 38 normal humans who had either small or very large Y chromosomes. Chromosome identification was based on the QFQ technique. The distance between the X and Y chromosome was measured from centromere to centromere. The spatial distance between X and Y was significantly smaller when the Y was small as compared to a very large Y (p less than 0.05). The distance increased as the length of the Y chromosome increased and a significant correlation coefficient (r = 0.58) was found (p less than 0.05). It is concluded that the length of the Y chromosome appears to play a major role in the non-random distribution of X and Y at somatic metaphase. The size and XY relationship in aneuploidy resulting from paternal non-disjunction and in patients with XXY and XYY should be investigated.
journal_name
J Med Genetjournal_title
Journal of medical geneticsauthors
Dosik D,Verma RSdoi
10.1136/jmg.20.6.450subject
Has Abstractpub_date
1983-12-01 00:00:00pages
450-1issue
6eissn
0022-2593issn
1468-6244journal_volume
20pub_type
杂志文章abstract::The beta thalassaemia alleles in 50 beta thalassaemia heterozygotes originating from many parts of the United Arab Emirates (UAE) have been characterised using the allele specific priming technique of the polymerase chain reaction (PCR). The IVSI-5 (G-->C) mutation was found to be present in 66%, while six other allel...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.31.1.59
更新日期:1994-01-01 00:00:00
abstract:BACKGROUND:Azoospermia is the absence of a measurable level of spermatozoa in the semen. It affects approximately 1% of all men, and the genetic basis of the majority of idiopathic cases is unknown. We investigated two unrelated consanguineous families with idiopathic azoospermia. In family 1, there were three azoosper...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmedgenet-2013-102102
更新日期:2014-04-01 00:00:00
abstract:BACKGROUND:The 5α-reductase type 2 (5α-RD2) deficiency caused by mutations in the steroid 5α-reductase 2 (SRD5A2) gene results in variable degrees of undervirilisation in patients with 46,XY disorders of sex development. This study aims to profile the regional distribution and phenotype-genotype characteristics of SRD5...
journal_title:Journal of medical genetics
pub_type: 杂志文章,多中心研究
doi:10.1136/jmedgenet-2018-105915
更新日期:2019-10-01 00:00:00
abstract:BACKGROUND:The non-POU domain containing octamer-binding gene (NONO) is located on chromosome Xq13.1 and encodes a member of a small family of RNA-binding and DNA-binding proteins that perform a variety of tasks involved in RNA synthesis, transcriptional regulation and DNA repair. Loss-of-function variants in NONO have...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmedgenet-2016-104039
更新日期:2017-01-01 00:00:00
abstract::A 2-year-old boy with macrocephaly, communicating hydrocephalus, and mild hepatosplenomegaly was found to have mild Hunter syndrome (MPS II). Establishment of the latter diagnosis was complicated by the paucity of obvious physical findings because of the patient's young age and his ethnic origin. ...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.14.6.445
更新日期:1977-12-01 00:00:00
abstract::Shortening of the tubular bones of the hands and feet with cone shaped epiphyses is known as peripheral dysostosis and is common to several syndromes including acrodysostosis and Albright's hereditary osteodystrophy (AHO). The underlying defect in AHO is known to be a reduction in bioactivity of the alpha subunit of t...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.34.2.133
更新日期:1997-02-01 00:00:00
abstract::Bazex-Dupre-Christol syndrome (BDCS) is an X linked dominant disorder of the hair follicle characterised by follicular atrophoderma, multiple basal cell carcinomas, hypotrichosis, milia, and localised hypohidrosis. Follicular atrophoderma (FA) are follicular funnel shaped depressions, "ice pick marks", seen most commo...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.33.6.493
更新日期:1996-06-01 00:00:00
abstract::The spontaneous and mitomycin C (MMC) induced sister chromatid exchange (SCE) frequencies were examined in five adults with myotonic dystrophy (MD). There was no significant difference in the spontaneous incidence of SCE between MD patients and controls. However, a significantly enhanced response to the induction of S...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.19.2.135
更新日期:1982-04-01 00:00:00
abstract::Cytological and cytogenetic studies were performed on nucleated fetal cells present in chorionic villus transport medium. The erythroblastic origin of these cells was shown. Fetal erythroblasts in spontaneous mitosis were frequently observed; chromosome counts were obtained from them but poor quality often prevented b...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.29.10.709
更新日期:1992-10-01 00:00:00
abstract::Primary ciliary dyskinesia is an autosomal recessive condition characterised by chronic sinusitis, bronchiectasis, and subfertility. Situs inversus occurs in 50% of cases (Kartagener syndrome). It has an estimated incidence of 1 in 20 000 live births. The clinical phenotype is caused by defective ciliary function asso...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.37.4.241
更新日期:2000-04-01 00:00:00
abstract::Generalised recessive dystrophic epidermolysis bullosa (EB) is a severe inherited disease in which patients suffer from blistering and scarring of the skin and mucous membranes after minor mechanical trauma. Tight genetic linkage has been established to the type VII collagen gene (COL7A1) at 3p21, with no evidence of ...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.32.9.749
更新日期:1995-09-01 00:00:00
abstract::We have previously mapped autosomal dominant spinocerebellar ataxia (SCA) 16 to 3p26, overlapping with the locus of SCA15. Recently, partial deletions of ITPR1 and the neighbouring SUMF1 in the SCA15 and two additional families were reported. In the present study we determined the copy number of these genes by real ti...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.2007.053942
更新日期:2008-01-01 00:00:00
abstract:INTRODUCTION:We report a 34-year-old Japanese female with a Silver-Russell syndrome (SRS)-like phenotype and a mosaic Turner syndrome karyotype (45,X/46,XX). METHODS/RESULTS:Molecular studies including methylation analysis of 17 differentially methylated regions (DMRs) on the autosomes and the XIST-DMR on the X chromo...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.2010.079343
更新日期:2010-11-01 00:00:00
abstract:BACKGROUND:Chromosome 13q deletion is associated with varying phenotypes, which seem to depend on the location of the deleted segment. Although various attempts have been made to link the 13q deletion intervals to distinct phenotypes, there is still no acknowledged consensus correlation between the monosomy of distinct...
journal_title:Journal of medical genetics
pub_type: 信件
doi:10.1136/jmg.2006.043059
更新日期:2007-01-01 00:00:00
abstract::Type 1 Gaucher disease families were studied in an attempt to establish a phenotype/genotype correlation in affected persons and also to identify carriers accurately. In the Portuguese type 1 Gaucher patients, screening for mutations N370S, L444P, R463C, and 1066 + 1 G-->A allowed the identification of 85% of the alle...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.31.5.401
更新日期:1994-05-01 00:00:00
abstract::There are 23 females known with Duchenne or Becker muscular dystrophy (DMD or BMD) who have X;autosome translocations that disrupt the X chromosome within band p21. A female with a t(X;4)(p21;q35) translocation was identified prenatally at routine amniocentesis. At birth, she was found to have a raised CK level, consi...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.27.7.426
更新日期:1990-07-01 00:00:00
abstract:BACKGROUND:Ichthyosis and neurological involvement occur in relatively few known Mendelian disorders caused by mutations in genes relevant both for epidermis and neural function. OBJECTIVES:To identify the cause of a similar phenotype of ichthyotic keratoderma, spasticity, mild hypomyelination (on MRI) and dysmorphic ...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmedgenet-2017-105172
更新日期:2018-06-01 00:00:00
abstract::X linked hypohidrotic ectodermal dysplasia (XHED) affects many epithelial functions, including sweat gland formation. Female carriers who manifest XHED may have defective dentition or a patchy distribution of sweating or both, as determined by starch and iodine sweat testing. Such sweat testing can be useful in assign...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.28.5.330
更新日期:1991-05-01 00:00:00
abstract::Human chromosome 9 with a pericentric inversion involving the qh region is considered normal. It has probably evolved through breakage and reunion and is retained through mendelian inheritance without any apparent phenotypic consequences. Fluorescent in situ hybridisation (FISH) technique using alpha, beta, and satell...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.33.5.395
更新日期:1996-05-01 00:00:00
abstract:INTRODUCTION:The Tousled-like kinases 1 and 2 (TLK1 and TLK2) are involved in many fundamental processes, including DNA replication, cell cycle checkpoint recovery and chromatin remodelling. Mutations in TLK2 were recently associated with 'Mental Retardation Autosomal Dominant 57' (MRD57, MIM# 618050), a neurodevelopme...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmedgenet-2020-107281
更新日期:2020-12-15 00:00:00
abstract::Tuberous sclerosis (TSC) is an autosomal dominant disorder characterised by tumour-like malformations (hamartomas) of the brain, skin, and other organs, often associated with seizures and learning disability. There is genetic heterogeneity with loci for TSC on chromosomes 9q34 (TSC1) and 16p13.3 (TSC2). The recently c...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.35.12.969
更新日期:1998-12-01 00:00:00
abstract::A new dicentric X isochromosome i(X)(pter to q2102 to pter) of similar size to a normal X is described in a girl with gonadal dysgenesis. In this non-mosaic case with an X short arm duplication, most of the stigmata associated with Turner's syndrome were absent. This structure was compared with that of six i(Xq) and t...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.16.4.278
更新日期:1979-08-01 00:00:00
abstract::A 4 year old boy is reported with tyrosinase positive hypopigmentation, mental retardation, ataxia, and myopia. Radiological investigation showed occipital cerebral atrophy, coxa valga, and generalised osteoporosis. The skin histology and electron microscopy are reported and discussed. The clinical features are simila...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.24.2.118
更新日期:1987-02-01 00:00:00
abstract::A family is recorded in which Duchenne's muscular dystrophy and protan colour blindness are segregating. Of 4 members of the second generation at least one is a recombinant. The lod scores have been calculated and added to those already published. ...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.14.2.130
更新日期:1977-04-01 00:00:00
abstract::A 2-year-old boy with mental and growth retardation is presented; he has a 46,XY,r(10)(p15q26) chromosome complement. Five previously reported cases of ring chromosome 10 were reviewed and compared with the present case in an attempt to delineate a clinical syndrome. Since the first description, identified by Giemsa b...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.20.2.142
更新日期:1983-04-01 00:00:00
abstract::As the variability and possible clinical significance of palm increase abnormalities receive greater attention, an accurate and objective method for evaluating the palm increase variants is required. A new method is described employing a topographic approach. A network of co-ordinates drawn on the palm prints enables ...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.13.4.310
更新日期:1976-08-01 00:00:00
abstract:BACKGROUND:Infantile-onset encephalopathy and hypertrophic cardiomyopathy caused by mitochondrial oxidative phosphorylation defects are genetically heterogeneous with defects involving both the mitochondrial and nuclear genomes. OBJECTIVE:To identify the causative genetic defect in two sisters presenting with lethal i...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmedgenet-2015-103361
更新日期:2016-02-01 00:00:00
abstract:BACKGROUND:Tuberous sclerosis complex (TSC) is a rare autosomal dominant genetic disorder. Due to the various manifestations of TSC and their potential complications, a multidisciplinary care approach is recommended by consensus guidelines. OBJECTIVES:Our study aimed to give a complete description of our TSC adult coh...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmedgenet-2019-106607
更新日期:2021-01-01 00:00:00
abstract:BACKGROUND:In total, 43 patients having short stature syndrome in 37 Yakut families with autosomal recessive prenatal and postnatal nonprogressive growth failure and facial dysmorphism but with normal intelligence have been identified. METHODS:Because Yakuts are considered as a population isolate and the disease is ra...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.2007.051979
更新日期:2007-12-01 00:00:00
abstract::The risk of breast cancer for unaffected men who test positive for a BRCA2 mutation is based on very few retrospective studies. We have used both retrospective and prospective analysis in 321 families with pathogenic BRCA2 mutations. Three breast cancers occurred in male first-degree relatives after family ascertainme...
journal_title:Journal of medical genetics
pub_type: 杂志文章
doi:10.1136/jmg.2009.075176
更新日期:2010-10-01 00:00:00