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One CNV Discordance in NRXN1 Observed Upon Genome-wide Screening in 38 Pairs of Adult Healthy Monozygotic Twins
Karolinska Inst, Dept Med Epidemiol & Biostat, Box 281, S-17177 Stockholm, Sweden..
Ewha Womans Univ, Dept Stat, Seoul, South Korea..
Karolinska Inst, Dept Med Epidemiol & Biostat, Box 281, S-17177 Stockholm, Sweden..
Univ N Carolina, Dept Genet, Chapel Hill, NC USA..
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2016 (English)In: Twin Research and Human Genetics, ISSN 1832-4274, E-ISSN 1839-2628, Vol. 19, no 2, 97-103 p.Article in journal (Refereed) PublishedText
Abstract [en]

Monozygotic (MZ) twins stem from the same single fertilized egg and therefore share all their inherited genetic variation. This is one of the unequivocal facts on which genetic epidemiology and twin studies are based. To what extent this also implies that MZ twins share genotypes in adult tissues is not precisely established, but a common pragmatic assumption is that MZ twins are 100% genetically identical also in adult tissues. During the past decade, this view has been challenged by several reports, with observations of differences in post-zygotic copy number variations (CNVs) between members of the same MZ pair. In this study, we performed a systematic search for differences of CNVs within 38 adult MZ pairs who had been misclassified as dizygotic (DZ) twins by questionnaire-based assessment. Initial scoring by PennCNV suggested a total of 967 CNV discor dances. The within-pair correlation in number of CNVs detected was strongly dependent on confidence score filtering and reached a plateau of r = 0.8 when restricting to CNVs detected with confidence score larger than 50. The top-ranked discordances were subsequently selected for validation by quantitative polymerase chain reaction (qPCR), from which one single similar to 120kb deletion in NRXN1 on chromosome 2 (bp 51017111-51136802) was validated. Despite involving an exon, no sign of cognitive/mental consequences was apparent in the affected twin pair, potentially reflecting limited or lack of expression of the transcripts containing this exon in nerve/brain.

Place, publisher, year, edition, pages
2016. Vol. 19, no 2, 97-103 p.
Keyword [en]
copy number variation, NRXN1, monozygotic twins, PennCNV, quantitative polymerase chain reaction
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-294296DOI: 10.1017/thg.2016.5ISI: 000373258000002PubMedID: 26899349OAI: oai:DiVA.org:uu-294296DiVA: diva2:929536
Swedish Research Council, M-2005-1112Swedish Heart Lung Foundation, 20070481
Available from: 2016-05-19 Created: 2016-05-18 Last updated: 2016-05-19Bibliographically approved

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Feuk, Lars
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Medicinsk genetik och genomikScience for Life Laboratory, SciLifeLab
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