51. Genomic diagnosis for children with intellectual disability and/or developmental delay
- Author
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Kevin M. Bowling, Michelle L. Thompson, Michelle D. Amaral, Candice R. Finnila, Susan M. Hiatt, Krysta L. Engel, J. Nicholas Cochran, Kyle B. Brothers, Kelly M. East, David E. Gray, Whitley V. Kelley, Neil E. Lamb, Edward J. Lose, Carla A. Rich, Shirley Simmons, Jana S. Whittle, Benjamin T. Weaver, Amy S. Nesmith, Richard M. Myers, Gregory S. Barsh, E. Martina Bebin, and Gregory M. Cooper
- Subjects
Proband ,Male ,0301 basic medicine ,Developmental delay ,Developmental Disabilities ,Intellectual disability ,lcsh:Medicine ,Disease ,medicine.disease_cause ,0302 clinical medicine ,CSER ,Exome ,Medical diagnosis ,Young adult ,Family history ,Child ,Exome sequencing ,Genetics (clinical) ,Genetics ,0303 health sciences ,Mutation ,Genomics ,Child, Preschool ,Molecular Medicine ,Female ,De novo ,Adult ,Adolescent ,DNA Copy Number Variations ,lcsh:QH426-470 ,Biology ,Young Adult ,03 medical and health sciences ,medicine ,Humans ,Clinical sequencing ,Molecular Biology ,030304 developmental biology ,business.industry ,Research ,lcsh:R ,Infant ,Sequence Analysis, DNA ,medicine.disease ,Human genetics ,lcsh:Genetics ,030104 developmental biology ,business ,Neurocognitive ,030217 neurology & neurosurgery - Abstract
BackgroundDevelopmental disabilities have diverse genetic causes that must be identified to facilitate precise diagnoses. We describe genomic data from 371 affected individuals, 309 of which were sequenced as proband-parent trios.MethodsWhole exome sequences (WES) were generated for 365 individuals (127 affected) and whole genome sequences (WGS) were generated for 612 individuals (244 affected).ResultsPathogenic or likely pathogenic variants were found in 100 individuals (27%), with variants of uncertain significance in an additional 42 (11.3%). We found that a family history of neurological disease, especially the presence of an affected 1st degree relative, reduces the pathogenic/likely pathogenic variant identification rate, reflecting both the disease relevance and ease of interpretation of de novo variants. We also found that improvements to genetic knowledge facilitated interpretation changes in many cases. Through systematic reanalyses we have thus far reclassified 15 variants, with 11.3% of families who initially were found to harbor a VUS, and 4.7% of families with a negative result, eventually found to harbor a pathogenic or likely pathogenic variant. To further such progress, the data described here are being shared through ClinVar, GeneMatcher, and dbGAP.ConclusionOur data strongly support the value of large-scale sequencing, especially WGS within proband-parent trios, as both an effective first-choice diagnostic tool and means to advance clinical and research progress related to pediatric neurological disease.
- Published
- 2016
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