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Chromosome 15 - Genetics Home Reference Chromosome 15 is one of the 23 pairs of chromosomes in humans. Chromosome 15 spans about 100 million base pairs (the building material of DNA) and represents between 3 and 3.5 percent of the total DNA in cells. Genes on chromosome 15 are among the estimated 20,000 to 25,000 total genes in the human genome. www.ghr.nlm.nih.gov /chromosome=15   (1189 words)

Prader-Willi syndrome   (Site not responding. Last check: 2007-10-15) One chromosome 15 is inherited from the mother, or "maternal" in origin. Maternal uniparental disomy for chromosome 15 leads to PWS because the genes on chromosome 15 that should have been inherited from the father are missing, and the genes on both the chromosome 15s inherited from the mother are imprinted. Chromosome abnormality in which both chromosomes in a pair are inherited from the same parent. www.healthatoz.com /healthatoz/Atoz/ency/prader-willi_syndrome.jsp   (2351 words)

Chromosome 15, Distal Trisomy 15q Chromosome 15, Distal Trisomy 15q is an extremely rare chromosomal disorder in which the end (distal) portion of the long arm (q) of the 15th chromosome (15q) appears three times (trisomy) rather than twice in cells of the body. Chromosome 15, Distal Trisomy 15q is an extremely rare chromosomal disorder in which the end (distal) portion of the long arm (q) of the 15th chromosome appears three times (trisomy) rather than twice in cells of the body. Chromosomal analysis and genetic counseling are typically recommended for parents of an affected child to help confirm or exclude a chromosomal rearrangement in one of the parents. hw.healthdialog.com /kbase/nord/nord1101.htm   (2419 words)

Chromosome 15 Ring Chromosome 15 Ring results from loss (deletion) of genetic material from both ends of the 15th chromosome and a joining of the ends to form a ring. In individuals with Chromosome 15 Ring, the variability of associated symptoms and findings may depend upon the amount and location of genetic material lost from the 15th chromosome, the stability of the ring chromosome during subsequent cellular divisions, or other factors. Chromosomal analysis and genetic counseling are typically recommended for parents of an affected child to help confirm or exclude the presence of Chromosome 15 Ring, potential mosaicism, or a balanced translocation in one of the parents. www.peacehealth.org /kbase/nord/nord971.htm   (767 words)

Exploring Autism   (Site not responding. Last check: 2007-10-15) Isodicentric chromosome 15 is the scientific name for a specific type of chromosome abnormality. The extra chromosome is made up of a portion of chromosome 15 that has been duplicated and "inverted," so that there are two identical copies attached to one another that appear to be mirror images. The size of the idic(15) varies depending on the size of the region of chromosome 15 that is duplicated. www.exploringautism.org /autism/iso_chr15.htm   (866 words)

The Sanger Institute: Human Chromosome 6 Project Overview Chromosome 6 is a submetacentric chromosome that constitutes about 6% of the human genome. Chromosome 6 harbours the largest transfer RNA gene cluster in the genome; we have shown that this cluster co-localizes with a region of high transcriptional activity. The Chromosome 6 ACEDB database (6ace) is used as a tool for managing the in-house data and acts as the primary means by which chromosome 6 data generated at The Sanger Institute will be released into the public domain in an annotated and usable form. www.sanger.ac.uk /HGP/Chr6   (545 words)

Chromosome 15 - Genetics Home Reference There are many conditions related to genes on chromosome 15. A specific chromosomal change called an isodicentric chromosome 15 (previously called an inverted duplication 15) can affect growth and development. A larger isodicentric chromosome 15 can result in weak muscle tone (hypotonia), mental retardation, seizures, and behavioral problems. ghr.nlm.nih.gov /chromosome=15/show/null   (1189 words)

University of Pennsylvania Health System: News and Periodicals: News Releases   (Site not responding. Last check: 2007-10-15) In the case of chromosome 15, disease can be caused by rearrangements such as occurs in Prader-Willi and Angelman. Prader-Willi occurs when the chromosome is inherited from the father, and features mild cognitive impairment and morbid obesity; while Angelman is inherited from the mother, and is characterized by seizures, movement disorders, and severe mental retardation. Unlike the major genes associated with the two disorders, the function of the four genes discovered in the Nicholls lab are not dependent on which parent donated the chromosome. www.uphs.upenn.edu /news/News_Releases/sept03/chromosome15.htm   (891 words)

IDEAS - DESCRIPTION   (Site not responding. Last check: 2007-10-15) Isodicentric 15, abbreviated idic(15), is one of a group of genetic conditions known as chromosome abnormalities. People with idic(15) are typically born with 47 chromosomes in each of their body cells, instead of the usual 46 found in most people. People born without an extra chromosome but who have a segment of duplicated material within chromosome 15 (known as interstitial duplication 15q) may have features similar to those with idic(15). www.idic15.org /whatis.html   (486 words)

The Sanger Institute: Human Chromosome 22 Home This was the first time a human chromosome has been sequenced and included the largest continuous sequence determined from any organism atthe time (23 million bps). Chromosome 22 is the second smallest of the human autosomes. The sequence of chromosome 22 was determined by an international consortium of sequencing centres and collaborators from the chromosome 22 genetics community. www.sanger.ac.uk /HGP/Chr22   (447 words)

Molecular characterisation of four cases of intrachromosomal triplication of chromosome 15q11-q14 -- Ungaro et al. 38 ... Hybridisation with probes c512 (red) and b150L13 (green) to metaphase chromosomes of patient 4 (A) and ideogram of the triplicated chromosome 15 showing the relative position of the probes used (B). For probe c512 (red) the telomeric signal was of double intensity as compared to the centromeric signal; for probe b150L13 (green) the centromeric signal was stronger than the telomeric signal, indicating that the repeats of the triplication are normal (N) in the proximal and distal regions and inverted (I) in the central region. on the paternal chromosome and hypermethylation on the maternal www.jmedgenet.com /cgi/content/full/38/1/26   (5007 words)

The extrusion-capture model for chromosome partitioning in bacteria -- Lemon and Grossman 15 (16): 2031 -- Genes and ...   (Site not responding. Last check: 2007-10-15) The initial round of replication in the middle is duplicating the parental chromosome (thin fl) to generate the gray copies. Graumann, P.L. Bacillus subtilis SMC is required for proper arrangement of the chromosome and for efficient segregation of replication termini but not for bipolar movement of newly duplicated origin regions. Iismaa, T.P. and Wake, R.G. The normal replication terminus of the Bacillus subtilis chromosome, terC, is dispensable for vegetative growth and sporulation. www.genesdev.org /cgi/content/full/15/16/2031   (6268 words)

A patient with a supernumerary marker chromosome (15), Angelman syndrome, and uniparental disomy resulting from ...   (Site not responding. Last check: 2007-10-15) Cos27 signals are seen on both chromosome 15 homologues, but not on the SMC(15), indicating the absence of the PWACR on the marker chromosome. of the maternal chromosome 15 by trisomy rescue. Chromosome 15 abnormalities and the Prader-Willi syndrome: a follow-up report of 40 cases. jmg.bmjjournals.com /cgi/content/full/39/2/e9   (2323 words)

Towards a molecular understandingof Prader-Willi and Angelman syndromes -- Mann and Bartolomei 8 (10): 1867 -- Human ...   (Site not responding. Last check: 2007-10-15) The HERC2/Herc2 gene is unlikely to be imprinted given that it is expressed in somatic cell hybrids with a single maternal or a single paternal chromosome 15, it is located in a non-imprinted region in humans and mice and mutations in murine Herc2 are inherited as a recessive trait (13,16). This means that while chromosome 15 exhibits a normal biparental mode of inheritance, AS patients have two chromosomes with a paternal identity (hypomethylation and biallelic expression of paternally expressed genes) and PWS patients have two chromosomes with a maternal identity (hypermethylated and silent paternal genes). Additionally, the human chromosome 15 homologs replicate asynchronously and exhibit preferential association during late S phase of the cell cycle (62,63). hmg.oupjournals.org /cgi/content/full/8/10/1867   (5756 words)

Frequent translocations occur between low copy repeats on chromosome 22q11.2 (LCR22s) and telomeric bands of partner ...   (Site not responding. Last check: 2007-10-15) The breakpoint on chromosome 15 was between the C at 92581643 and the A at 92581644 (line). The breakpoint on chromosome 22 was between the A at 25528665 and the A at 25528666 (line). The partner chromosome probes shown in the images derive from clones that are specific to the unique sequences in the telomeric bands of specific chromosomes (color-coded). hmg.oupjournals.org /cgi/content/full/12/15/1823   (7039 words)

Multiple Mechanisms Regulate Imprinting of the Mouse Distal Chromosome 7 Gene Cluster -- Caspary et al. 18 (6): 3466 ...   (Site not responding. Last check: 2007-10-15) the Igf2r gene on mouse chromosome 17 (3, 58). The IPL gene on chromosome 11p15.5 is imprinted in humans and mice and is similar to TDAG51, implicated in Fas expression and apoptosis. Multipoint analysis of human chromosome 11p15/mouse distal chromosome 7: inclusion of H19/IGF2 in the minimal WT2 region, gene specificity of H19 silencing in Wilms' tumorigenesis and methylation hyper-dependence of H19 imprinting. mcb.asm.org /cgi/content/full/18/6/3466   (7266 words)

Specialty Laboratories ::: we help doctors help patients True trisomy 15 mosaicism is associated with cardiac anomalies, short neck and/or excess nuchal skin and webbed neck Trisomy 15 mosaicism also has been reported with no major or visible dysmorphia and severe inner organ defect. The latter rearrangement causes partial 15 tetrasomy results from an inverted duplication of chromosome 15. Gene assignments to chromosome 15 include the gene coding for hexosaminidase-A, whose mutation causes Tay-Sachs disease, and the major gene for Marfan syndrome. www.specialtylabs.com /books/display.asp?id=1182   (710 words)

Exploring Genes & Genetic Disorders cientists, enabled by the Human Genome Project, are churning out an unprecedented volume of data on human chromosomes and the tens of thousands of genes residing on them, many associated with genetic disorders. Each of the 24 different human chromosomes featured on this poster can be viewed online. Learn about the physical makeup of human chromosomes and see some of the genes that have been found on each one. www.ornl.gov /sci/techresources/Human_Genome/posters/chromosome   (556 words)

Integrated YAC Contig Map of the Prader-Willi/Angelman Region on Chromosome 15q11-q13 with Average STS Spacing of ...   (Site not responding. Last check: 2007-10-15) Chromosome 15q11-q13 is also associated with an unusually high frequency and diversity of recurring rearrangements. of chromosome 15 as a cause of the Prader-Willi syndrome. A Sequence-Ready BAC Contig of the GABAA Receptor Gene Cluster Gabrg1-Gabra2-Gabrb1 on Mouse Chromosome 5 www.genome.org /cgi/content/full/8/2/146   (3864 words)

University of Pennsylvania : Research at Penn : Health :: Instability on Chromosome 15 Linked to Genetic Disorders While it might have given our ancestors an evolutionary advantage, an "unstable" region on human chromosome 15 is also the source of a set of inherited neurological diseases. The first paper describes how breakpoint regions on human chromosome 15 contribute to chromosome rearrangements in evolution and Prader-Willi and Angelman syndromes, and identifies four new genes -- named NIPA1, NIPA2, CYFIPI, and GCP5 -- in the most unstable part of chromosome 15. Scientists have known that Prader-Willi and Angelman can be attributed to the disruption of genes that sit near breakpoints -- regions in the chromosome that are prone to being rearranged by the cell's genetic machinery before the chromosomes are passed to their offspring. www.upenn.edu /researchatpenn/preview/article.php?727&hlt   (722 words)

Danger On Chromosome 15 -- Unstable Region Yields Genes For Prader-Willi/Angelman Syndromes And Spastic Paraplegia   (Site not responding. Last check: 2007-10-15) Details of Chromosome 22 Structure Offer Clues to How Genes Are Lost in a Genetic Disease (March 2, 2000) -- Chromosome 22, a hot spot for human disease, yielded a few more secrets to genetics researchers from The Children's Hospital of Philadelphia. Sequence Of Human Chromosome 7 Is Fine-tuned And Finished (July 10, 2003) -- Researchers at Washington University School of Medicine in St. Louis, in collaboration with investigators at five other centers, have finished sequencing human chromosome 7. Scientists have known that Prader-Willi and Angelman can be attributed to the disruption of genes that sit near breakpoints — regions in the chromosome that are prone to being re-arranged by the cell's genetic machinery before the chromosomes are passed to their offspring. www.sciencedaily.com /releases/2003/09/030926065654.htm   (830 words)

Relative locations of the centromere and imprinted SNRPN gene within chromosome 15 territories during the cell cycle in ...   (Site not responding. Last check: 2007-10-15) Relative locations of the centromere and imprinted SNRPN gene within chromosome 15 territories during the cell cycle in HL60 cells -- Nogami et al. Relative locations of the centromere and imprinted SNRPN gene within chromosome 15 territories during the cell cycle in HL60 cells territory, its centromere, the SNRPN gene on this chromosome, and the jcs.biologists.org /cgi/content/abstract/113/12/2157   (416 words)

Higher Levels of Organization in the Interphase Nucleus of Cycling and Differentiated Cells -- Leitch 64 (1): 138 -- ...   (Site not responding. Last check: 2007-10-15) The rDNA loci (purple) on the 1Rs chromosome arms are drawn condensed and inactive and occupy the region of the nucleus with the highest overall level of DNA condensation. The distribution of chromosomes is significantly different between Sertoli cells and stimulated lymphocytes for chromosomes 3, 7, 8, and 17. Only for the acrocentric chromosomes 13 and 21, which form nucleoli in the center of the nucleus in both cell types, are there similar distributions. mmbr.asm.org /cgi/content/full/64/1/138   (9215 words)

Molecular characterisation of four cases of intrachromosomal triplication of chromosome 15q11-q14 -- Ungaro et al. 38 ...   (Site not responding. Last check: 2007-10-15) Molecular characterisation of four cases of intrachromosomal triplication of chromosome 15q11-q14 -- Ungaro et al. Molecular characterisation of four cases of intrachromosomal triplication of chromosome 15q11-q14 Chromosomal abnormalities that involve the proximal region of chromosome 15q occur relatively frequently in the human population. www.jmedgenet.com /cgi/content/abstract/38/1/26   (540 words)

HUMAN CHROMOSOME #15   (Site not responding. Last check: 2007-10-15) Human aromatase: cDNA cloning, Southern blot analysis, and assignment of the gene to chromosome 15. Localization of the genes for human inositol 1,4,5-triphosphate 3-kinase A (ITPKA) and B (ITPKB) to chromosome regions 15q14-21 and 1q41-43, respectively, by in situ hybridization. Human chromosomal localization of genes encoding the gamma1 and gamma2 subunits of the gamma-aminobutyric acid receptor indicates that members of this family are often clustered in the genome. www.il-st-acad-sci.org /genecats/hsa15.html   (341 words)

AllRefer Health - Prader-Willi Syndrome Prader-Willi syndrome is a congenital (present from birth) disease characterized by obesity, decreased muscle tone, decreased mental capacity, and hypogonadism. Prader-Willi is caused by the deletion of a gene on chromosome 15. For unkown reasons, only the copy of this gene on chromosome 15 that is received from the father is active. health.allrefer.com /health/prader-willi-syndrome-info.html   (466 words)

High-Throughput Detection of Submicroscopic Deletions and Methylation Status at 15q11-q13 by a Photo-Cross-Linking ...   (Site not responding. Last check: 2007-10-15) 15 homologs from one parent and none from the other. Chromosome breakage in the Prader-Willi and Angelman syndromes involves recombination between large, transcribed repeats at proximal and distal breakpoints. Farber C, Dittrich B, Buiting K, Horsthemke B. The chromosome 15 imprinting center (IC) region has undergone multiple duplication events and contains an upstream exon of SNRPN that is deleted in all Angelman syndrome patients with an IC microdeletion. www.clinchem.org /cgi/content/full/48/10/1844   (3331 words)

Human Genetics - UPD Maternal Chromosome 15   (Site not responding. Last check: 2007-10-15) The maternal chromosome is shown on the left. Devriendt, K.;Matthijs, G.;Claes, S.;Legius, E.;Proesmans, W.;Cassiman, J. J.;Fryns, J. Prader-Willi syndrome in a child with mosaic trisomy 15 and mosaic triplo-X: a molecular analysis. (1994): Bloom syndrome and maternal uniparental disomy for chromosome 15. www.genes.uchicago.edu /upd/upd15m.html   (484 words)

Chromosomal Conditions Chromosome 15 - isodicentric 15 (formerly, inverted duplication 15) Linden MG, Bender BG, Robinson A. "Intrauterine diagnosis of sex chromosome aneuploidy." OB GYN, 87:468-475, 1996. Prenatal Diagnosis of Sex Chromosome Abnormalities", 3rd edition, 1992, to be revised 1998. www.kumc.edu /gec/support/chromoso.html   (921 words)

Human to Mouse Homology Region Map, Chromosome 15 Gene order has been changed from that shown in the chromosome committee reports or online databases, as required by high-resolution human physical mapping data; these data also indicate a probable difference between human and mouse organization, e.g. The asterisk character ('*') is used to indicate a different region of homology on the same mouse chromosome. A question mark ('?') indicates that the authors are uncertain that this region is truly homologous. www.ncbi.nlm.nih.gov /Omim/Homology/human15.html   (298 words)

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