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Topic: Chromosome 15q partial deletion


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In the News (Thu 31 Dec 09)

  
  Partial charge Encyclopedia
A partial charge is a charge with an absolute value of less than one elementary charge unit (that is, smaller than the charge of the electron).
Partial atomic charges are used in molecular dynamics force fields to compute the electrostatic interaction energy using Coulomb's law.
Despite its usefulness, the concept of a partial atomic charge is somewhat arbitrary, because it depends on the method used to delimit between one atom and the next (in reality, atoms have no clear boundaries).
www.hallencyclopedia.com /topic/Partial_charge.html   (618 words)

  
 Prader-Willi syndrome Summary
Maternal uniparental disomy for chromosome 15 leads to PWS because the genes on the chromosome 15 that should have been inherited from the father are missing.
PWS is caused by absence of the paternally derived PWS/AS region of chromosome 15 (15q11-13) by one of several genetic mechanisms, including uniparental disomy, imprinting mutations, chromosome translocations, and gene deletions.
(Interestingly, a deletion on the maternal chromosome causes Angelman syndrome.) This is the first known instance of imprinting in humans, and is a fascinating model of this genetic phenomena.
www.bookrags.com /Prader-Willi_syndrome   (3151 words)

  
  chromosome - Hutchinson encyclopedia article about chromosome
A chromosome is a threadlike structure of nucleic acids and protein, carrying a set of linked genes, and (in the case of humans and most other higher organisms) paired with an identical copy.
These are the sex chromosomes – a short, male determining one called the Y chromosome and the X chromosome.
It is one of the smallest human chromosomes, and has been linked to a number of disorders, including schizophrenia and trisomy 22 (a common cause of miscarriage).
encyclopedia.farlex.com /chromosome   (477 words)

  
 Prader-Willi syndrome - Wikipedia, the free encyclopedia
The distinction of chromosome by parental origin is due to imprinting and PWS has the sister syndrome Angelman syndrome that affects maternally imprinted genes in the region.
PWS is caused by absence of the paternally derived PWS/AS region of chromosome 15 (15q11-13) by one of several genetic mechanisms, including uniparental disomy, imprinting mutations (i.e.
(Interestingly, a deletion on the maternal chromosome causes Angelman syndrome.) This is the first known instance of imprinting in humans, and is a fascinating model of this genetic phenomenon.
en.wikipedia.org /wiki/Prader-Willi_syndrome   (683 words)

  
 Medical Dictionary: Chromosome 15q, partial deletion - WrongDiagnosis.com - WrongDiagnosis.com
Chromosome 15q, partial deletion is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH).
This means that Chromosome 15q, partial deletion, or a subtype of Chromosome 15q, partial deletion, affects less than 200,000 people in the US population.
Terms that may be interchangeable with Chromosome 15q, partial deletion:
www.wrongdiagnosis.com /medical/chromosome_15q_partial_deletion_printer.htm   (220 words)

  
 [No title]
Deletion refers to the loss of a segment of a chromosome.
The deletions with an associated identifiable clinical phenotype (physical makeup of an individual) include Wolf-Hirschhorn syndrome (4p-), and cri-du-chat syndrome (5p-).
Other deletions that are clinically recognizable are deletions of 18p, 18q, 22q, 21q, 15q, 11p, 17p and 4q.
www.lycos.com /info/chromosome--individuals.html   (425 words)

  
 Prader-Willi syndrome (Genetic Disorder) - Medical Encyclopedia for Nursing Students
Prader-Willi syndrome is a genetic disorder in which seven genes (or some subset thereof) on chromosome 15 are missing or unexpressed (chromosome 15q, partial deletion).
This is caused by a misdevelopment of the hypothalamus.
The eighth gene in the segment, whose deletion causes Angelman syndrome, is expressed only on the maternal chromosome.
www.nursingstudy.com /encyclopedia/Prader_Willi_syndrome.html   (178 words)

  
 Virgin and Child
Deletions may be located at the chromosome ends or in interstitial segments of the chromosome and are usually associated with mental retardation and malformations.
Deletions may be observed in routine chromosome preparations, but microdeletions are detectable only under the microscope with prophase chromosome studies.
The deletion is recognized because of the absence of staining or fluorescence.
ldysinger.stjohnsem.edu /ThM_599d_Beg/09_gen_emb_dilem/04_chrom-abnorm.htm   (2828 words)

  
 Glossary of Terms That May Appear in Literature About Prader-Willi Syndrome.
In AS, however, the deletion is seen on the chromosome contributed by the mother, whereas those with PWS lack certain genes from the father.
Deletion: a condition in which a piece of genetic material is lost or missing from a chromosome.
The collection of chromosomes from the nucleus of a cell arranged according to established guidelines; the photomicrograph of chromosomes.
www.pwsausa.org /glossary.htm   (1434 words)

  
 Trisomy, Monosomy, Ring Chromosome 20p and Genetic Imprinting
Partial trisomy for the distal part of the short arm of chromosome 20 reported in a girl aged 11/2 years with typical craniofacial dysmorphies and psychomotor retardation.
A patient with triplication of all of chromosome arm 20p is presented to illustrate the relatively modest degree of developmental delay that can result from autosomal triplication and the role of nondisjunction as a mechanism for deriving a partial triplication status.
Deleted chromosome 20 from a patient with Alagille syndrome isolated in a cell hybrid through leucine transport selection: study of three candidate genes.
www.mad-cow.org /~tom/chr20_rings_trisomy.html   (4116 words)

  
 Journal of Carcinogenesis | Full text | Tumor suppressor gene alterations in patients with malignant mesothelioma due ...
A total of 12 chromosomal regions were researched by comparing genomic DNA samples isolated from blood and pleural effusion (using PCR, and polyacrilamid gel electrophoresis denaturizing), on 2 different chromosomes which have 9 different polymorphic determinants at 6q and 3 different polymorphic determinants at 9p using molecular genetic methods on 13 patients clinico-pathologically diagnosed MPM.
The extent of the partial deletions was used to define 4 discrete minimal regions of nonoverlapping deletion, shortest region overlap 1, 2, 3 and 4 (SRO1, SRO2, SRO3 and SRO4).
Although there is no common specific chromosomal alteration in MPM patients, inactivation and/or loss of TSG caused by frequent cytogenetic deletions of MPM are thought to be responsible in neoplastic development and progression of mesothelial cells [11].
www.carcinogenesis.com /content/5/1/23   (3437 words)

  
 hydroceph-chomosomes.html
By using 36 yeast artificial chromosome and cosmid clones from a contig covering 6p22.3-6p25 and other probes with defined cytogenetic locations within 6p21-6p22 we have precisely localised the breakpoints involved in each of the cases, estimated the sizes of the deleted regions and defined the region that is hemizygously deleted in both cases.
The 8q12.2-q21.2 deletion suggests that reduced dosage of the relevant genes is sufficient to cause Duane syndrome, BOR syndrome and this dominant form of hydrocephalus.
To determine the parental origin of chromosomes 13 and 14 in the proband, we have studied the genotypes of DNA polymorphic markers due to (GT)n repeats in the patient and her parents' blood DNA.
www.indiana.edu /~pietsch/hydroceph-chromosomes.html   (6930 words)

  
 International League Against Epilepsy
In 18 cases the epilepsy onset was constituted by myoclonic status; in the others the initial seizures are mostly partial motor seizures, more or less typical, myoclonic absences, massive myoclonias, and more rarely generalized or unilateral clonic seizures recurring in some cases only in the case of a febrile illness.
Considering that a lot of the patients with Angelman syndrome and some of the patients with 4p-syndrome have a chromosomal deletion eliminating a cluster of GABAA receptor genes, it is possible to hypothesize that a loss of GABAergic inhibition could play a role in the pathogenesis of myoclonic status in nonprogressive encephalopathies.
In the first group are included all the patients with chromosomal aberration; the patients in the second group are all females and affected by a nonprogressive encephalopathy of unknown etiology.
www.ilae-epilepsy.org /Visitors/Centre/ctf/myoclon_stat_nonpro_enceph.cfm   (2016 words)

  
 BioMed Central | Full text | Partial duplication of the APBA2gene in chromosome 15q13 corresponds to duplicon structures
Chromosomal abnormalities affecting human chromosome 15q11-q13 underlie multiple genomic disorders caused by deletion, duplication and triplication of intervals in this region.
Chromosome 15 is the most frequently involved chromosome in cases of autism with supernumerary marker chromosomes.
Partial duplications of a 6-kb segment containing the first coding exon are present as two copies at ~5-Mb telomeric in 15q13.3 and are not transcribed.
www.biomedcentral.com /1471-2164/4/15   (4256 words)

  
 BioMed Central | Full text | Coarctation of the aorta and mild to moderate developmental delay in a child with a de ...
Interstitial deletion of chromosome 15q21q22 is an infrequently described chromosomal abnormality.
Congenital heart disease was described in one patient with 15q21q24 deletion [5] and two patients with interstitial deletion of chromosome 15q15q21 and 15q15q22 respectively [7,8].
Congenital heart defect with septal hypertrophy and dilatation of the aorta and pulmonary artery was described in one patient with the deletion of 15q21q24 [5], who died at 8 months of age.
www.biomedcentral.com /1471-2350/7/8   (2662 words)

  
 Prader-Willi syndrome - Psychology Wiki - a Wikia wiki
The distinction of chromosome by parental origin is due to imprinting and PWS has the sister syndrome Angelman syndrome that affects maternally imprinted genes in the region.
PWS is caused by absence of the paternally derived PWS/AS region of chromosome 15 (15q11-13) by one of several genetic mechanisms, including uniparental disomy, imprinting mutations (i.e.
(Interestingly, a deletion on the maternal chromosome causes Angelman syndrome.) This is the first known instance of imprinting in humans, and is a fascinating model of this genetic phenomenon.
psychology.wikia.com /wiki/Prader-Willi_syndrome   (843 words)

  
 Prader Willi syndrome - prader-willi syndrome seizures
PWS is caused by absence of the paternally derived PWS/AS region of chromosome 15 by one of several genetic mechanisms, including uniparental disomy, imprinting mutations, chromosome translocations, and gene deletions.
(Interestingly, a deletion on the maternal chromosome causes Angelman syndrome.) This is the first known instance of imprinting in humans.
The prader-willi syndrome risk to the sibling of an affected child of having PWS depends upon the genetic mechanism which caused the disorder.
www.medicalgeo.com /Med-Diseases-Po---Q/Prader-Willi-syndrome.html   (455 words)

  
 Angelman Syndrome Foundation: Recent Publications
In the majority of patients with a chromosome 15 imprinting defect (ID) causing Prader-Willi syndrome (PWS) or Angelman syndrome (AS), the defect is a primary epimutation that occurred spontaneously in the absence of a DNA mutation.
The acquisition of a paternal epigenotype on the maternal chromosome in the mutant mice was demonstrated by the ability to rescue the lethality and growth retardation in a mouse model of a PWS imprinting defect.
The deletions can also be sub-classified based on their size into Class I and Class II with the former being larger.
www.angelman.org /angel/index.php?id=172   (6229 words)

  
 Triplication of distal chromosome 10q -- Devriendt et al. 36 (3): 242 -- Journal of Medical Genetics
By means of probe Y915A2, three signals on one of the chromosomes 10q were visualised (arrows), confirming the triplication of distal chromosome 10q.
Mosaic isodicentric chromosome 9 with triplication (9p22-pter) and no deletion in an abnormal infant presenting with clinical features of trisomy 9; a new type of isodicentric chromosome formation.
Partial triplication and duplication of 5p14-15.3 associated with features of trisomy 5p.
jmg.bmjjournals.com /cgi/content/full/36/3/242   (1474 words)

  
 Skin pigmentary anomalies and mosaicism for an acentric marker chromosome originating from 3q -- Portnoï et al. 36 ...
The marker was identified by FISH using panels of whole chromosome painting probes as originating from chromosome 3.
Association of pigmentary anomalies with chromosomal and genetic mosaicism and chimerism.
Chromosomal origin of small ring marker chromsomes in man: characterization by molecular genetics.
jmg.bmjjournals.com /cgi/content/full/36/3/246   (3188 words)

  
 Chromosome Disorders / Family Village
The National Center For Chromosome Inversions is a non-profit corporation that acts as a information clearing house for patients and their families, that have been diagnosed with a chromosome inversion of any kind.
This is a group for those interested in chromosome anomalies involving the three biggest chromosomes, chromosomes 1, 2 or 3.
This group is intended as a support for families, caregivers, and persons affected by deletions on chromosome 10q.
www.familyvillage.wisc.edu /lib_chro.htm   (921 words)

  
 Prader-Willi syndrome Disability
It was identified in 1956by Andrea Prader, Heinrich Willi, Alexis Labhart, and Guido Fanconi of Switzerland.
PWS is caused by absence of the paternally derived PWS/AS region of chromosome 15 by one of several genetic mechanisms, including uniparental disomy, imprintingmutations, chromosome translocations, and gene deletions.
(Interestingly, a deletion on the maternal chromosome causes Angelman syndrome.) This is the first known instance of imprintingin humans.
www.lumrix.com /medical/disability/prader-willi_syndrome.html   (423 words)

  
 Amazon.com: "paternal deletion": Key Phrase page   (Site not responding. Last check: 2007-10-13)
This puzzling observation of finding only a paternal deletion was later clarified by molecular genetic techniques and the reporting of a maternal deletion in a separate clinical condition recognized...
Approximately 85 percent of deletions occur de novo, and in 80 percent the deleted chromosome is paternal.
The partial deletion of the short arm of chromosome 5 causes the cri du chat syndrome.
www.amazon.com /phrase/paternal-deletion   (529 words)

  
 Articles and Information Chromosome Deletion Outreach, Inc. (CDO) Rare Chromosome Disorder Support and Information
Partial 9p Monosomy in a Girl with a tdic (9p23;13p11) translocation, mino anomalies, obesity and mental retardation.
Chromosome 15q terminal deletion Insulin-like growth factor I receptor expression and function in fibroblasts from two patients with deletion of the distal long arm of chromosome 15.
Chromosome 17q duplication Clinical characteristics associated with dup 17 (q24q25.1) in a mosaic mother and two non-mosaic daughters, Clinical Dysmorphology.
members.aol.com /sorgl/update2.htm   (2667 words)

  
 Organisation of the pericentromeric region of chromosome 15: at least four partial gene copies are amplified in ...
Organisation of the pericentromeric region of chromosome 15: at least four partial gene copies are amplified in patients with a proximal duplication of 15q -- Fantes et al.
Organisation of the pericentromeric region of chromosome 15: at least four partial gene copies are amplified in patients with a proximal duplication of 15q
on chromosome 15, or as the parent of a fetus with a proximal
jmg.bmj.com /cgi/content/full/39/3/170   (4942 words)

  
 Chromosome Walking | Research, News, Information and Resources | GeneticsInfo.com   (Site not responding. Last check: 2007-10-13)
While, in principle, chromosome walking and development of new markers from large fragment clones can assist in closing these gaps, this approach is labor intensive and can be subject to failure if...
Chromosome walking Chromosome walking is a method in genetics for identifying and sequencing long parts of a DNA strand, e.g., a chromosome.
Chromosome walking in the NMPDR environment using the Compare Regions tool will be demonstrated and compared to chromosome walking in the GBrowse environment.
www.geneticsinfo.com /chromosomes/chromosomewalking   (1824 words)

  
 Specialty Laboratories ::: we help doctors help patients
The latter rearrangement causes partial 15 tetrasomy results from an inverted duplication of chromosome 15.
The phenotype of an interstitial deletion 15q13 includes gross congenital anomalies consisting of large fontanelles and sutures, midface hypoplasia, flat ears with thin cartilage, prominent eyes, anteverted nostrils, cleft palate, positional deformation of hands and feet, hypertonia and inner organ malformations.
Clinical correlation of molecular 15q deletions and maternal disomy for chromosome 15 in Prader-Willi.
www.specialtylabs.com /books/display.asp?id=1182   (710 words)

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