Human subtelomeric copy number gains suggest a DNA replication mechanism for formation: beyond breakage–fusion

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Human subtelomeric copy number gains suggest a DNA replication mechanism for formation: beyond breakage–fusion–bridge for telomere stabilization

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作者：Svetlana A. Yatsenko (1) (2) (3) Patricia Hixson (1) Erin K. Roney (1) Daryl A. Scott (1) Christian P. Schaaf (1) Yu-tze Ng (4) Robbin Palmer (5) Richard B. Fisher (6) Ankita Patel (1) Sau Wai Cheung (1) James R. Lupski (1) (7) (8)
刊名：Human Genetics
出版年：2012
出版时间：December 2012
年：2012
卷：131
期：12
页码：1895-1910
全文大小：845KB
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作者单位：Svetlana A. Yatsenko (1) (2) (3) Patricia Hixson (1) Erin K. Roney (1) Daryl A. Scott (1) Christian P. Schaaf (1) Yu-tze Ng (4) Robbin Palmer (5) Richard B. Fisher (6) Ankita Patel (1) Sau Wai Cheung (1) James R. Lupski (1) (7) (8) 1. Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Room 604B, Houston, TX, 77030, USA 2. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh, Pittsburgh, USA 3. Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, USA 4. Barrow Neurological Institute, Phoenix, AZ, USA 5. Northern Nevada Genetic Counseling, Reno, NV, USA 6. Teesside Genetics Unit, The James Cook University Hospital, Middlesbrough, UK 7. Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA 8. Texas Children’s Hospital, Houston, TX, USA
ISSN：1432-1203

文摘

Constitutional deletions of distal 9q34 encompassing the EHMT1 (euchromatic histone methyltransferase 1) gene, or loss-of-function point mutations in EHMT1, are associated with the 9q34.3 microdeletion syndrome, also known as Kleefstra syndrome [MIM#610253]. We now report further evidence for genomic instability of the subtelomeric 9q34.3 region as evidenced by copy number gains of this genomic interval that include duplications, triplications, derivative chromosomes and complex rearrangements. Comparisons between the observed shared clinical features and molecular analyses in 20 subjects suggest that increased dosage of EHMT1 may be responsible for the neurodevelopmental impairment, speech delay, and autism spectrum disorders revealing the dosage sensitivity of yet another chromatin remodeling protein in human disease. Five patients had 9q34 genomic abnormalities resulting in complex deletion–duplication or duplication–triplication rearrangements; such complex triplications were also observed in six other subtelomeric intervals. Based on the specific structure of these complex genomic rearrangements (CGR) a DNA replication mechanism is proposed confirming recent findings in Caenorhabditis elegans telomere healing. The end-replication challenges of subtelomeric genomic intervals may make them particularly prone to rearrangements generated by errors in DNA replication.