Cited by 590Genomic variations and chromosomal abnormalitiesGenome Rearrangement AlgorithmsGenetics and Neurodevelopmental Disorders

Recurrent reciprocal 16p11.2 rearrangements associated with global developmental delay, behavioural problems, dysmorphism, epilepsy, and abnormal head size

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Shinawi, Marwan, Liu, Pengfei, Kang, Sung-Hae L, Shen, Joseph, Belmont, John W, Scott, Daryl A, Probst, Frank J, Craigen, William J +20 more·2010·Journal of Medical Genetics

Abstract

Background: Deletion and the reciprocal duplication in 16p11.2 were recently associated with autism and developmental delay. Method: We indentified 27 deletions and 18 duplications of 16p11.2 were identified in 0.6% of all samples submitted for clinical array-CGH (comparative genomic hybridisation) analysis. Detailed molecular and phenotypic characterisations were performed on 17 deletion subjects and ten subjects with the duplication. Results: The most common clinical manifestations in 17 deletion and 10 duplication subjects were speech/language delay and cognitive impairment. Other phenotypes in the deletion patients included motor delay (50%), seizures (∼40%), behavioural problems (∼40%), congenital anomalies (∼30%), and autism (∼20%). The phenotypes among duplication patients included motor delay (6/10), behavioural problems (especially attention deficit hyperactivity disorder (ADHD)) (6/10), congenital anomalies (5/10), and seizures (3/10). Patients with the 16p11.2 deletion had statistically significant macrocephaly (p<0.0017) and 6 of the 10 patients with the duplication had microcephaly. One subject with the deletion was asymptomatic and another with the duplication had a normal cognitive and behavioural phenotype. Genomic analyses revealed additional complexity to the 16p11.2 region with mechanistic implications. The chromosomal rearrangement was de novo in all but 2 of the 10 deletion cases in which parental studies were available. Additionally, 2 de novo cases were apparently mosaic for the deletion in the analysed blood sample. Three de novo and 2 inherited cases were observed in the 5 of 10 duplication patients where data were available. Conclusions: Recurrent reciprocal 16p11.2 deletion and duplication are characterised by a spectrum of primarily neurocognitive phenotypes that are subject to incomplete penetrance and variable expressivity. The autism and macrocephaly observed with deletion and ADHD and microcephaly seen in duplication patients support a diametric model of autism spectrum and psychotic spectrum behavioural phenotypes in genomic sister disorders.

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Crossref · 10.1136/jmg.2009.073015

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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].”
  • Motor delays are reported at rates of 57.1% and 50% in 16p11.2 deletion carriers, and in 60% of duplication carriers.

    “Motor delays are reported at rates of 57.1% [15] and 50% [17] in deletion carriers, and in 60% of duplication carriers [17].”
  • 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).”

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Authors
Shinawi, M., Liu, P., Kang, S.-H. L., Shen, J., Belmont, J. W., Scott, D. A., Probst, F. J., Craigen, W. J., Graham, B. H., Pursley, A., Clark, G., Lee, J., Proud, M., Stocco, A., Rodriguez, D. L., Kozel, B. A., Sparagana, S., Roeder, E. R., McGrew, S. G., Kurczynski, T. W., Allison, L. J., Amato, S., Savage, S., Patel, A., Stankiewicz, P., Beaudet, A. L., Cheung, S. W., & Lupski, J. R.
Affiliations
  • Baylor College of Medicine (US)
  • Children's Hospital Central California (US)
  • Texas Children's Hospital (US)
  • Washington University in St. Louis (US)
  • Texas Scottish Rite Hospital for Children (US)
  • The University of Texas at San Antonio Health Science Center (US)
  • Monroe Carell Jr. Children's Hospital (US)
  • Akron Children's Hospital (US)
  • Eastern Maine Medical Center (US)
Corresponding author
Cheung, Sau Wai
Venue
Journal of Medical Genetics
Publisher
BMJ
Published
2009-11-12
Volume
47
Issue
5
Pages
332-341
ISSN
  • 0022-2593 (ISSN-L)
  • 1468-6244
OpenAlex
W2151523001
Cited by
580
References
49
Citations by year
2026: 10 · 2025: 17 · 2024: 21 · 2023: 26 · 2022: 24 · 2021: 33 · 2020: 21 · 2019: 35 · 2018: 62 · 2017: 23 · 2016: 25 · 2015: 44 · 2014: 36 · 2013: 43 · 2012: 58
FWCI
31.02
Type
journal article
Language
en
Open access
Locations
  • Journal of Medical Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Neurological Disorders and Stroke (R01NS058529)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD037283)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genome Rearrangement Algorithms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
16p11.2, 16p11.2 deletion, 16p11.2 duplication, global developmental delay, autism spectrum disorder, macrocephaly, microcephaly, epilepsy, attention deficit hyperactivity disorder, behavioral problems, dysmorphic features, de novo rearrangement, mosaicism, incomplete penetrance, variable expressivity, neurocognitive phenotype, array comparative genomic hybridization
MeSH terms
Abnormalities, Multiple, Adolescent, Attention Deficit Disorder with Hyperactivity, Autistic Disorder, Child, Developmental Disabilities, Child, Preschool, Chromosome Aberrations, Chromosome Deletion, Chromosomes, Human, Pair 16, Epilepsy, Female, Humans, Infant, Language Development Disorders, Male, Intellectual Disability, Microcephaly, Phenotype, Craniofacial Abnormalities, Oligonucleotide Array Sequence Analysis, Comparative Genomic Hybridization, Young Adult, Segmental Duplications, Genomic

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