Cited by 742Fetal and Pediatric Neurological DisordersGenomics and Rare DiseasesGenetics and Neurodevelopmental Disorders

De novo germline and postzygotic mutations in AKT3, PIK3R2 and PIK3CA cause a spectrum of related megalencephaly syndromes

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Finding of Rare Disease Genes (FORGE) Canada Consortium, Rivière, Jean-Baptiste, Mirzaa, Ghayda M, O'Roak, Brian J, Beddaoui, Margaret, Alcantara, Diana, Conway, Robert L, St-Onge, Judith +33 more·2012·Nature Genetics

Abstract

Megalencephaly-capillary malformation (MCAP) and megalencephaly-polymicrogyria-polydactyly-hydrocephalus (MPPH) syndromes are sporadic overgrowth disorders associated with markedly enlarged brain size and other recognizable features. We performed exome sequencing in 3 families with MCAP or MPPH, and our initial observations were confirmed in exomes from 7 individuals with MCAP and 174 control individuals, as well as in 40 additional subjects with megalencephaly, using a combination of Sanger sequencing, restriction enzyme assays and targeted deep sequencing. We identified de novo germline or postzygotic mutations in three core components of the phosphatidylinositol 3-kinase (PI3K)-AKT pathway. These include 2 mutations in AKT3, 1 recurrent mutation in PIK3R2 in 11 unrelated families with MPPH and 15 mostly postzygotic mutations in PIK3CA in 23 individuals with MCAP and 1 with MPPH. Our data highlight the central role of PI3K-AKT signaling in vascular, limb and brain development and emphasize the power of massively parallel sequencing in a challenging context of phenotypic and genetic heterogeneity combined with postzygotic mosaicism.

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  • Somatic mutations identified in human hemimegalencephaly (HMG) reveal the dysregulated PI3K-AKT3-mTOR pathway as the causative mechanism.

    “Somatic mutations that were identified in human hemimegalencephaly (HMG) revealed the dysregulated phosphoinositide 3-kinase (PI3K)–AKT3-mTOR pathway as the causative mechanism (Lee et al., 2012; Poduri et al., 2012; Riviere et al., 2012).”

    From Genetic Changes Shaping the Human Brain (2015) · cites this paper as Riviere et al., 2012

  • Additional somatic mutations causing HMG implicate key upstream and downstream components of the PI3K-AKT3-mTOR pathway, namely PI3K and mTOR.

    “Additional somatic mutations causing HMG have been identified that implicate key upstream and downstream components of this pathway, namely PI3K and mTOR (Lee et al., 2012; Riviere et al., 2012).”

    From Genetic Changes Shaping the Human Brain (2015) · cites this paper as Riviere et al., 2012

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Authors
Finding of Rare Disease Genes (FORGE) Canada Consortium, Rivière, J.-B., Mirzaa, G. M., O'Roak, B. J., Beddaoui, M., Alcantara, D., Conway, R. L., St-Onge, J., Schwartzentruber, J. A., Gripp, K. W., Nikkel, S. M., Worthylake, T., Sullivan, C. T., Ward, T. R., Butler, H. E., Kramer, N. A., Albrecht, B., Armour, C. M., Armstrong, L., Caluseriu, O., Cytrynbaum, C., Drolet, B. A., Innes, A. M., Lauzon, J. L., Lin, A. E., Mancini, G. M. S., Meschino, W. S., Reggin, J. D., Saggar, A. K., Lerman-Sagie, T., Uyanik, G., Weksberg, R., Zirn, B., Beaulieu, C. L., Majewski, J., Bulman, D. E., O'Driscoll, M., Shendure, J., Graham, J. M., Boycott, K. M., & Dobyns, W. B.
Affiliations
  • Seattle Children's Hospital (US)
  • University of Chicago (US)
  • University of Ottawa (CA)
  • University of Sussex (GB)
  • Michigan State University (US)
  • McGill University and Génome Québec Innovation Centre (CA)
  • Alfred I. duPont Hospital for Children (US)
  • Children's Hospital of Eastern Ontario (CA)
  • Cedars-Sinai Medical Center (US)
  • Essen University Hospital (DE)
  • Queen's University (CA)
  • University of British Columbia (CA)
  • University of Calgary (CA)
  • Hospital for Sick Children (CA)
  • Medical College of Wisconsin (US)
  • Massachusetts General Hospital (US)
  • Erasmus MC (NL)
  • North York General Hospital (CA)
  • Providence Sacred Heart Medical Center (US)
  • University of London (GB)
  • University of Göttingen (DE)
  • McGill University (CA)
  • University of Washington (US)
Corresponding author
Dobyns, William B
Venue
Nature Genetics
Published
2012-06-24
Volume
44
Issue
8
Pages
934-940
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W2016910640
Cited by
741
References
55
Citations by year
2026: 27 · 2025: 33 · 2024: 44 · 2023: 38 · 2022: 49 · 2021: 66 · 2020: 61 · 2019: 50 · 2018: 51 · 2017: 57 · 2016: 60 · 2015: 72 · 2014: 61 · 2013: 61 · 2012: 10
FWCI
57.21
Type
journal article
Language
en
Open access
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • GRO (submittedVersion)
Funders
  • McGill University
  • Cancer Research UK
  • National Institutes of Health (UL1TR000124, 1rc2hl103010-01)
  • Canadian Institutes of Health Research
  • National Heart, Lung, and Blood Institute (RC2HL102925, RC2HL102926, RC2HL102923, UC2HL102924, RC2HL-103010, UC2HL102925, UC2HL102923, UC2HL103010, RC2HL102924, UC2HL102926)
  • National Institute of General Medical Sciences (5-T32-GM08243, T32GM008243)
  • National Institute of Neurological Disorders and Stroke (NS058721, R01NS046616, R01NS058721)
  • National Institute of Environmental Health Sciences (HHSN273200800010C)
  • National Center for Advancing Translational Sciences
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD36657)
Topics
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Fetal and Pediatric Neurological Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
megalencephaly, PI3K/Akt signaling, AKT3, PIK3R2, PIK3CA, de novo germline mutation, postzygotic mutation, postzygotic mosaicism, overgrowth syndromes, capillary malformation, polymicrogyria, polydactyly, hydrocephalus, brain development, vascular development, limb development
MeSH terms
Humans, Hydrocephalus, Mutation, Syndrome, Germ-Line Mutation, Phosphatidylinositol 3-Kinases, Mutation, Missense, Proto-Oncogene Proteins c-akt, Malformations of Cortical Development, Class I Phosphatidylinositol 3-Kinases, Megalencephaly, Exome

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