Cited by 207Genomic variations and chromosomal abnormalitiesGenetics and Neurodevelopmental DisordersGenome Rearrangement Algorithms

Speech delays and behavioral problems are the predominant features in individuals with developmental delays and 16p11.2 microdeletions and microduplications

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Rosenfeld, Jill A., Coppinger, Justine, Bejjani, Bassem A., Girirajan, Santhosh, Eichler, Evan E., Shaffer, Lisa G., Ballif, Blake C.·2010·Journal of Neurodevelopmental Disorders

Abstract

Microdeletions and microduplications encompassing a ~593-kb region of 16p11.2 have been implicated as one of the most common genetic causes of susceptibility to autism/autism spectrum disorder (ASD). We report 45 microdeletions and 32 microduplications of 16p11.2, representing 0.78% of 9,773 individuals referred to our laboratory for microarray-based comparative genomic hybridization (aCGH) testing for neurodevelopmental and congenital anomalies. The microdeletion was de novo in 17 individuals and maternally inherited in five individuals for whom parental testing was available. Detailed histories of 18 individuals with 16p11.2 microdeletions were reviewed; all had developmental delays with below-average intelligence, and a majority had speech or language problems or delays and various behavioral problems. Of the 16 individuals old enough to be evaluated for autism, the speech/behavior profiles of seven did not suggest the need for ASD evaluation. Of the remaining nine individuals who had speech/behavior profiles that aroused clinical suspicion of ASD, five had formal evaluations, and three had PDD-NOS. Of the 19 microduplications with parental testing, five were de novo, nine were maternally inherited, and five were paternally inherited. A majority with the microduplication had delayed development and/or specific deficits in speech or language, though these features were not as consistent as seen with the microdeletions. This study, which is the largest cohort of individuals with 16p11.2 alterations reported to date, suggests that 16p11.2 microdeletions and microduplications are associated with a high frequency of cognitive, developmental, and speech delay and behavior abnormalities. Furthermore, although features associated with these alterations can be found in individuals with ASD, additional factors are likely required to lead to the development of ASD.

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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].”
  • 16p11.2 deletions are associated with macrocephaly and obesity, while duplications often lead to microcephaly and low body weight/BMI.

    “Deletions of 16p11.2 are associated with increased head circumference (macrocephaly) [10, 12, 17, 23] and obesity [10, 12, 16, 20], whereas duplications often result in below average head size (microcephaly) [10, 17, 23, 24] and low body weight/BMI [10, 24].”
  • In individuals with neurodevelopmental disorders, genetic screenings find 16p11.2 deletions at rates of 0.25-2.9% and duplications at rates of 0.15-0.78%.

    “Data compiled from eight studies [13, 15–17, 20, 24, 26, 33] screening individuals with either ASD, ID, developmental delay (DD), dysmorphic features (DF), multiple congenital anomalies (MCA), obesity, or seizures find 16p11.2 deletions at rates of 0.25–2.9%, and duplications at rates between 0.15–0.78% (Table 1).”
  • Epilepsy/seizures ranks among the most common phenotypes observed in both 16p11.2 deletions and duplications.

    “Epilepsy/seizures ranks among the most common phenotypes observed in both 16p11.2 deletions and duplications [10, 12, 16, 17, 33, 36] (Table 2).”
  • 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].”

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Authors
Rosenfeld, J. A., Coppinger, J., Bejjani, B. A., Girirajan, S., Eichler, E. E., Shaffer, L. G., & Ballif, B. C.
Affiliations
University of Washington (US)
Corresponding author
Ballif, Blake C.
Venue
Journal of Neurodevelopmental Disorders
Published
2009-11-12
Volume
2
Issue
1
Pages
26-38
ISSN
  • 1866-1947 (ISSN-L)
  • 1866-1955
OpenAlex
W2004075871
Cited by
207
References
24
Citations by year
2026: 4 · 2025: 6 · 2024: 10 · 2023: 9 · 2022: 8 · 2021: 9 · 2020: 15 · 2019: 11 · 2018: 8 · 2017: 11 · 2016: 6 · 2015: 10 · 2014: 12 · 2013: 13 · 2012: 18
FWCI
37.48
Type
book chapter
Language
en
Open access
Locations
  • Journal of Neurodevelopmental Disorders (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD065285)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genome Rearrangement Algorithms
Keywords
16p11.2 microdeletion, developmental delay, speech delay, language delay, behavioral problems, autism spectrum disorder, intellectual disability, de novo copy number variation, parental inheritance, pervasive developmental disorder not otherwise specified, neurodevelopmental disorders

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