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Truncating biallelic variant in DNAJA1, encoding the co-chaperone Hsp40, is associated with intellectual disability and seizures

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Abstract

Intellectual disability poses a huge burden on the health care system, and it is one of the most common referral reasons to the genetic and child neurology clinic. Intellectual disability (ID) is genetically heterogeneous, and it is associated with several other neurological conditions. Exome sequencing is a robust genetic tool and has revolutionized the process of molecular diagnosis and novel gene discovery. Besides its diagnostic clinical value, novel gene discovery is prime in reverse genetics, when human mutations help to understand the function of a gene and may aid in better understanding of the human brain and nervous system. Using WES, we identified a biallelic truncating variant in DNAJA1 gene (c.511C>T p.(Gln171*) in a multiplex Saudi consanguineous family. The main phenotype shared between the siblings was intellectual disability and seizure disorder.

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Acknowledgments

We would thank the studied family for their enthusiastic participation.

Funding

The research by STA and FJGV reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) through the baseline fund and the Office of Sponsored Research (OSR), under award number FCC/1/1976-25-01.

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Authors and Affiliations

  1. Department of Pediatric Neurology, Texas Children’s Hospital, Baylor College of Medicine, Houston, TX, USA

    Saud Alsahli

  2. King Abdullah International Medical Research Center (KAIMRC), College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia

    Saud Alsahli, Duaa Ba-Armah & Fuad Al Mutairi

  3. Department of Pathology and Laboratory Medicine, King Abdulaziz Medical City, Ministry of National Guard-Health Affairs (MNGHA), Riyadh, Saudi Arabia

    Ahmed Alfares

  4. Department of Pediatrics, Qassim University, Almulyda, Buraydah, Saudi Arabia

    Ahmed Alfares

  5. Division of Biological and Environmental Sciences and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Center (CBRC), Thuwal, 23955-6900, Saudi Arabia

    Francisco J. Guzmán-Vega & Stefan T. Arold

  6. Department of Pediatrics, King Abdulaziz Medical City, Division of Pediatric Neurology, Ministry of National Guard-Health Affairs (MNGHA), Riyadh, Saudi Arabia

    Duaa Ba-Armah

  7. Division of Genetics, Department of Pediatrics, King Abdulaziz Medical City, Ministry of National Guard-Health Affairs (MNGHA), Riyadh, Saudi Arabia

    Fuad Al Mutairi

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  1. Saud Alsahli
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  2. Ahmed Alfares
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  3. Francisco J. Guzmán-Vega
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  4. Stefan T. Arold
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  5. Duaa Ba-Armah
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  6. Fuad Al Mutairi
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Contributions

SA and FA created the presented idea and wrote the manuscript. SA, DB, and FA contributed to the patient care and diagnosis. SA, AA, DB, and FA prepared the tables. SA, AA, STA, FJG, and FA prepared the figures. SA, AA, STA, FJG, DB, and FA edited the manuscript.

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Correspondence to Fuad Al Mutairi.

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Table S1

Regions of homozygosity in the current cohort. (DOCX 14 kb)

Table S2

Detailed clinical synopsis (DOCX 15 kb)

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Alsahli, S., Alfares, A., Guzmán-Vega, F.J. et al. Truncating biallelic variant in DNAJA1, encoding the co-chaperone Hsp40, is associated with intellectual disability and seizures. Neurogenetics 20, 109–115 (2019). https://doi.org/10.1007/s10048-019-00573-6

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