Cited by 175Genomics and Rare DiseasesGenetics and Neurodevelopmental DisordersGenomic variations and chromosomal abnormalities

Mapping autosomal recessive intellectual disability: combined microarray and exome sequencing identifies 26 novel candidate genes in 192 consanguineous families

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Harripaul, R, Vasli, N, Mikhailov, A, Rafiq, M A, Mittal, K, Windpassinger, C, Sheikh, T I, Noor, A +24 more·2018·Molecular Psychiatry

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Abstract

Approximately 1% of the global population is affected by intellectual disability (ID), and the majority receive no molecular diagnosis. Previous studies have indicated high levels of genetic heterogeneity, with estimates of more than 2500 autosomal ID genes, the majority of which are autosomal recessive (AR). Here, we combined microarray genotyping, homozygosity-by-descent (HBD) mapping, copy number variation (CNV) analysis, and whole exome sequencing (WES) to identify disease genes/mutations in 192 multiplex Pakistani and Iranian consanguineous families with non-syndromic ID. We identified definite or candidate mutations (or CNVs) in 51% of families in 72 different genes, including 26 not previously reported for ARID. The new ARID genes include nine with loss-of-function mutations (ABI2, MAPK8, MPDZ, PIDD1, SLAIN1, TBC1D23, TRAPPC6B, UBA7 and USP44), and missense mutations include the first reports of variants in BDNF or TET1 associated with ID. The genes identified also showed overlap with de novo gene sets for other neuropsychiatric disorders. Transcriptional studies showed prominent expression in the prenatal brain. The high yield of AR mutations for ID indicated that this approach has excellent clinical potential and should inform clinical diagnostics, including clinical whole exome and genome sequencing, for populations in which consanguinity is common. As with other AR disorders, the relevance will also apply to outbred populations.

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  • A homozygous loss-of-function mutation p.Arg132Ter in ABI2 was identified in a cohort of 192 multiplex Pakistani and Iranian consanguineous families.

    “Furthermore, a homozygous LoF mutation, p.Arg132Ter, in ABI2 was identified through a combination of microarray genotyping, homozygosity-by-descent (HBD) mapping, CNV analysis, and exome sequencing. This discovery was made within a cohort of 192 multiplex Pakistani and Iranian consanguineous families.”
  • ABI2 is one of 26 newly identified candidate genes associated with autosomal recessive non-syndromic intellectual disability.

    “ABI2 is one of the 26 newly identified candidate genes associated with autosomal recessive non-syndromic ID140 (Table 2x).”

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Authors
Harripaul, R., Vasli, N., Mikhailov, A., Rafiq, M. A., Mittal, K., Windpassinger, C., Sheikh, T. I., Noor, A., Mahmood, H., Downey, S., Johnson, M., Vleuten, K., Bell, L., Ilyas, M., Khan, F. S., Khan, V, Moradi, M., Ayaz, M., Naeem, F., Heidari, A., Ahmed, I., Ghadami, S., Agha, Z., Zeinali, S., Qamar, R., Mozhdehipanah, H., John, P., Mir, A., Ansar, M., French, L., Ayub, M., & Vincent, J. B.
Affiliations
  • Centre for Addiction and Mental Health (CA)
  • Medical University of Graz (AT)
  • Mount Sinai Hospital (CA)
  • International Islamic University, Islamabad (PK)
  • Quaid-i-Azam University (PK)
  • Qazvin University of Medical Sciences (IR)
  • Queen's University (CA)
  • National University of Sciences and Technology (PK)
  • Pasteur Institute of Iran (IR)
  • COMSATS University Islamabad (PK)
Corresponding author
  • Ayub, M
  • Vincent, J B
Venue
Molecular Psychiatry
Published
2017-04-11
Volume
23
Issue
4
Pages
973-984
ISSN
  • 1359-4184 (ISSN-L)
  • 1476-5578
OpenAlex
W2951249912
Cited by
175
References
7
Citations by year
2026: 9 · 2025: 11 · 2024: 19 · 2023: 18 · 2022: 21 · 2021: 26 · 2020: 25 · 2019: 13 · 2018: 24 · 2017: 8
FWCI
12.41
Type
journal article
Language
en
Open access
Locations
  • Molecular Psychiatry (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
Funders
  • Radboud Universiteit
  • Tehran University of Medical Sciences and Health Services
  • Radboud Universitair Medisch Centrum
  • Peterborough K. M. Hunter Charitable Foundation
  • Canadian Institutes of Health Research (102758_1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
Keywords
autosomal recessive intellectual disability, consanguinity, homozygosity mapping, copy number variation, novel candidate genes, loss-of-function mutations, brain-derived neurotrophic factor, TET1, neuropsychiatric disorders, genetic heterogeneity
MeSH terms
Exome Sequencing, Loss of Function Mutation, Adult, Chromosome Mapping, Consanguinity, Family, Female, Genes, Recessive, Homozygote, Humans, Iran, Male, Intellectual Disability, Middle Aged, Mutation, Pakistan, Pedigree, Genetic Heterogeneity, Microarray Analysis, DNA Copy Number Variations

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