Different distribution of the genetic subtypes of the Prader-Willi syndrome in the elderly

The Prader–Willi syndrome (PWS) is a genetic disorder caused by the absent expression of the paternal copy of maternally imprinted genes in chromosome region 15q11–13. The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mU...

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Veröffentlicht in:European journal of human genetics : EJHG 2010-09, Vol.18 (9), p.993-998
Hauptverfasser: Sinnema, Margje, van Roozendaal, Kees E P, Maaskant, Marian A, Smeets, Hubert J M, Engelen, John J M, Jonker-Houben, Nieke, Schrander-Stumpel, Constance T R M, Curfs, Leopold M G
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container_title European journal of human genetics : EJHG
container_volume 18
creator Sinnema, Margje
van Roozendaal, Kees E P
Maaskant, Marian A
Smeets, Hubert J M
Engelen, John J M
Jonker-Houben, Nieke
Schrander-Stumpel, Constance T R M
Curfs, Leopold M G
description The Prader–Willi syndrome (PWS) is a genetic disorder caused by the absent expression of the paternal copy of maternally imprinted genes in chromosome region 15q11–13. The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mUPD) and 3–5% others (imprinting centre (IC) defects and translocations). Little is known about factors that influence the frequency of genetic subtypes in PWS. The study sample comprised 102 adults with clinically and genetically confirmed PWS, contacted through the Dutch Prader–Willi Parent Association and through physicians specialized in treating persons with intellectual disabilities. Genetic testing showed 55 persons (54%) with a paternal deletion, 44 persons (43%) with an mUPD and 3 persons (3%) with a defect of the IC. The observed distribution in our study differed from that in literature (70% deletion, 30% mUPD), which was statistically significant ( z -score: P
doi_str_mv 10.1038/ejhg.2010.67
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The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mUPD) and 3–5% others (imprinting centre (IC) defects and translocations). Little is known about factors that influence the frequency of genetic subtypes in PWS. The study sample comprised 102 adults with clinically and genetically confirmed PWS, contacted through the Dutch Prader–Willi Parent Association and through physicians specialized in treating persons with intellectual disabilities. Genetic testing showed 55 persons (54%) with a paternal deletion, 44 persons (43%) with an mUPD and 3 persons (3%) with a defect of the IC. The observed distribution in our study differed from that in literature (70% deletion, 30% mUPD), which was statistically significant ( z -score: P &lt;0.05). This was mainly caused by a higher proportion of mUPD in the advanced age groups. Differences in maternal age and BMI of persons with PWS could not explain the differences in distribution across the age groups. Our study population had a much broader age range, compared with other studies, because of a predominance of elderly people (40+ years) with PWS. In other studies, these elderly persons might have been undiagnosed and/or underreported because of a lack of genetic diagnosis. The results underline both the need for correct genetic diagnosis in all persons with PWS and adjustment of the guidelines for preventive management in adulthood.</description><identifier>ISSN: 1018-4813</identifier><identifier>EISSN: 1476-5438</identifier><identifier>DOI: 10.1038/ejhg.2010.67</identifier><identifier>PMID: 20461108</identifier><language>eng</language><publisher>Cham: Springer International Publishing</publisher><subject>631/208/2489/144 ; 692/700/139/1512 ; 692/700/1518 ; Adult ; Adults ; Age composition ; Age groups ; Aged ; Bioinformatics ; Biomedical and Life Sciences ; Biomedicine ; Birth defects ; Caregivers ; Chromosome 15 ; Chromosome translocations ; Chromosomes ; Clonal deletion ; Cytogenetics ; Diagnosis ; Female ; Gene Expression ; Genetic disorders ; Genetic screening ; Genetic Testing ; Genetics ; Genomic Imprinting ; Genotype &amp; phenotype ; Geriatrics ; Human Genetics ; Humans ; Hydrocarbons ; Imprinting ; Intellectual disabilities ; Male ; Mental retardation ; Middle Aged ; Mortality ; Netherlands ; Older people ; Population ; Population studies ; Prader-Willi syndrome ; Prader-Willi Syndrome - genetics ; Psychosis ; Reproductive technologies ; Statistical analysis ; Studies ; Uniparental disomy</subject><ispartof>European journal of human genetics : EJHG, 2010-09, Vol.18 (9), p.993-998</ispartof><rights>Macmillan Publishers Limited 2010</rights><rights>Copyright Nature Publishing Group Sep 2010</rights><rights>Copyright © 2010 Macmillan Publishers Limited 2010 Macmillan Publishers Limited</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c473t-fb69e05bbe63ee6793f9b8b25b112f9d546e15190391a500b5e31fb406f29d7d3</citedby><cites>FETCH-LOGICAL-c473t-fb69e05bbe63ee6793f9b8b25b112f9d546e15190391a500b5e31fb406f29d7d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2987424/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2987424/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,727,780,784,885,27924,27925,53791,53793</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/20461108$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Sinnema, Margje</creatorcontrib><creatorcontrib>van Roozendaal, Kees E P</creatorcontrib><creatorcontrib>Maaskant, Marian A</creatorcontrib><creatorcontrib>Smeets, Hubert J M</creatorcontrib><creatorcontrib>Engelen, John J M</creatorcontrib><creatorcontrib>Jonker-Houben, Nieke</creatorcontrib><creatorcontrib>Schrander-Stumpel, Constance T R M</creatorcontrib><creatorcontrib>Curfs, Leopold M G</creatorcontrib><title>Different distribution of the genetic subtypes of the Prader-Willi syndrome in the elderly</title><title>European journal of human genetics : EJHG</title><addtitle>Eur J Hum Genet</addtitle><addtitle>Eur J Hum Genet</addtitle><description>The Prader–Willi syndrome (PWS) is a genetic disorder caused by the absent expression of the paternal copy of maternally imprinted genes in chromosome region 15q11–13. The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mUPD) and 3–5% others (imprinting centre (IC) defects and translocations). Little is known about factors that influence the frequency of genetic subtypes in PWS. The study sample comprised 102 adults with clinically and genetically confirmed PWS, contacted through the Dutch Prader–Willi Parent Association and through physicians specialized in treating persons with intellectual disabilities. Genetic testing showed 55 persons (54%) with a paternal deletion, 44 persons (43%) with an mUPD and 3 persons (3%) with a defect of the IC. The observed distribution in our study differed from that in literature (70% deletion, 30% mUPD), which was statistically significant ( z -score: P &lt;0.05). This was mainly caused by a higher proportion of mUPD in the advanced age groups. Differences in maternal age and BMI of persons with PWS could not explain the differences in distribution across the age groups. Our study population had a much broader age range, compared with other studies, because of a predominance of elderly people (40+ years) with PWS. In other studies, these elderly persons might have been undiagnosed and/or underreported because of a lack of genetic diagnosis. 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The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mUPD) and 3–5% others (imprinting centre (IC) defects and translocations). Little is known about factors that influence the frequency of genetic subtypes in PWS. The study sample comprised 102 adults with clinically and genetically confirmed PWS, contacted through the Dutch Prader–Willi Parent Association and through physicians specialized in treating persons with intellectual disabilities. Genetic testing showed 55 persons (54%) with a paternal deletion, 44 persons (43%) with an mUPD and 3 persons (3%) with a defect of the IC. The observed distribution in our study differed from that in literature (70% deletion, 30% mUPD), which was statistically significant ( z -score: P &lt;0.05). This was mainly caused by a higher proportion of mUPD in the advanced age groups. Differences in maternal age and BMI of persons with PWS could not explain the differences in distribution across the age groups. Our study population had a much broader age range, compared with other studies, because of a predominance of elderly people (40+ years) with PWS. In other studies, these elderly persons might have been undiagnosed and/or underreported because of a lack of genetic diagnosis. The results underline both the need for correct genetic diagnosis in all persons with PWS and adjustment of the guidelines for preventive management in adulthood.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><pmid>20461108</pmid><doi>10.1038/ejhg.2010.67</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects 631/208/2489/144
692/700/139/1512
692/700/1518
Adult
Adults
Age composition
Age groups
Aged
Bioinformatics
Biomedical and Life Sciences
Biomedicine
Birth defects
Caregivers
Chromosome 15
Chromosome translocations
Chromosomes
Clonal deletion
Cytogenetics
Diagnosis
Female
Gene Expression
Genetic disorders
Genetic screening
Genetic Testing
Genetics
Genomic Imprinting
Genotype & phenotype
Geriatrics
Human Genetics
Humans
Hydrocarbons
Imprinting
Intellectual disabilities
Male
Mental retardation
Middle Aged
Mortality
Netherlands
Older people
Population
Population studies
Prader-Willi syndrome
Prader-Willi Syndrome - genetics
Psychosis
Reproductive technologies
Statistical analysis
Studies
Uniparental disomy
title Different distribution of the genetic subtypes of the Prader-Willi syndrome in the elderly
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