Cited by 731Genomic variations and chromosomal abnormalitiesAutism Spectrum Disorder ResearchGenetics and Neurodevelopmental Disorders

Recurrent 16p11.2 microdeletions in autism

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Kumar, R. A., KaraMohamed, S., Sudi, J., Conrad, D. F., Brune, C., Badner, J. A., Gilliam, T. C., Nowak, N. J. +3 more·2007·Human Molecular Genetics

Abstract

Autism is a childhood neurodevelopmental disorder with a strong genetic component, yet the identification of autism susceptibility loci remains elusive. We investigated 180 autism probands and 372 control subjects by array comparative genomic hybridization (aCGH) using a 19K whole-genome tiling path bacterial artificial chromosome microarray to identify submicroscopic chromosomal rearrangements specific to autism. We discovered a recurrent 16p11.2 microdeletion in two probands with autism and none in controls. The deletion spans approximately 500-kb and is flanked by approximately 147-kb segmental duplications (SDs) that are >99% identical, a common characteristic of genomic disorders. We assessed the frequency of this new autism genomic disorder by screening an additional 532 probands and 465 controls by quantitative PCR and identified two more patients but no controls with the microdeletion, indicating a combined frequency of 0.6% (4/712 autism versus 0/837 controls; Fisher exact test P = 0.044). We confirmed all 16p11.2 deletions using fluorescence in situ hybridization, microsatellite analyses and aCGH, and mapped the approximate deletion breakpoints to the edges of the flanking SDs using a custom-designed high-density oligonucleotide microarray. Bioinformatic analysis localized 12 of the 25 genes within the microdeletion to nodes in one interaction network. We performed phenotype analyses and found no striking features that distinguish patients with the 16p11.2 microdeletion as a distinct autism subtype. Our work reports the first frequency, breakpoint, bioinformatic and phenotypic analyses of a de novo 16p11.2 microdeletion that represents one of the most common recurrent genomic disorders associated with autism to date.

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  • Deletions and duplications of 16p11.2 have highly pleiotropic phenotypic effects, with strong links to ASD, ID, motor/developmental delay, dysmorphic features, and epilepsy/seizures.

    “Deletions and duplications of 16p11.2 have highly pleiotropic phenotypic effects, with strong links to ASD [8–19], ID [8, 10, 12, 14–16, 19–21], motor/developmental delay [8–10, 12, 13, 15–19, 22], dysmorphic features [8, 12, 16, 17, 22], and epilepsy/seizures [10, 12, 17].”
  • Genetic screenings of ASD patients repeatedly identify 16p11.2 deletions and duplications, placing them among the strongest genetic risk factors for ASD.

    “Genetic screenings of ASD patients repeatedly identify 16p11.2 deletions & duplications, placing them among the strongest genetic risk factors for ASD [11, 13, 16, 38].”
  • Deletions and/or duplications at specific loci including 1q21.1, 15q11.2-13.1, 15q13.2-13.3, 16p11.2, 17q12, and 22q11.2 show evidence for association with ASD.

    “These include deletions and/or duplications at specific loci, including: 1q21.1, 15q11.2-13.1, 15q13.2-13.3, 16p11.2, 17q12, and 22q11.2”
  • Recurrent structural variations involving NRXN1, CNTN4, NLGN1, ASTN2, PTCHD1, and DDX53 show evidence for association with ASD.

    “recurrent structural variations involving one or a small number of genes, including: Neurexin 1 (NRXN1), Contactin 4 (CNTN4), Neuroligin 1 (NLGN1), Astrotactin 2 (ASTN2), and the contiguous genes Patched Domain Containing 1 (PTCHD1) and DEAD box Protein 53 (DDX53)”
  • Identical mutations may be associated with highly divergent phenotype.

    “identical mutations may be associated with highly divergent phenotype”

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Authors
Kumar, R. A., KaraMohamed, S., Sudi, J., Conrad, D. F., Brune, C., Badner, J. A., Gilliam, T. C., Nowak, N. J., Cook, E. H., Dobyns, W. B., & Christian, S. L.
Affiliations
  • University of Chicago (US)
  • University of Illinois Chicago (US)
  • Roswell Park Comprehensive Cancer Center (US)
Corresponding author
Christian, S. L.
Venue
Human Molecular Genetics
Published
2007-11-07
Volume
17
Issue
4
Pages
628-638
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2162066558
Cited by
731
References
42
Citations by year
2026: 5 · 2025: 10 · 2024: 16 · 2023: 17 · 2022: 16 · 2021: 37 · 2020: 33 · 2019: 25 · 2018: 30 · 2017: 32 · 2016: 21 · 2015: 41 · 2014: 42 · 2013: 46 · 2012: 57
FWCI
35.84
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Human Molecular Genetics (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Autism Speaks
  • National Institutes of Health
  • National Institute of Mental Health (MH 64547, 1R01MH64547-01, R01MH064547)
  • National Institute of Neurological Disorders and Stroke (R01NS051812, 1R01 NS51812)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
autism spectrum disorder, 16p11.2 microdeletion, genomic disorders, segmental duplication, de novo deletion, chromosomal rearrangements, gene interaction networks, autism subtypes
MeSH terms
Autistic Disorder, Base Sequence, Child, Chromosome Deletion, Chromosomes, Human, Pair 16, Female, Gene Frequency, Humans, Male, Pedigree, Phenotype, Case-Control Studies, Polymerase Chain Reaction, In Situ Hybridization, Fluorescence, DNA Primers, Microsatellite Repeats, Chromosome Breakage, Genetic Predisposition to Disease, Chromosomes, Artificial, Bacterial

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