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The diagnostic yield of whole exome sequencing as a first approach in consanguineous Omani renal ciliopathy syndrome patients

Lookup NU author(s): Intisar Al Alawi, Miguel Barroso Gil, Laura Powell, Dr Eric Olinger, Professor John Sayer

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2021 Al Alawi I et al.Background: Whole exome sequencing (WES) is becoming part of routine clinical and diagnostic practice. In the investigation of inherited cystic kidney disease and renal ciliopathy syndromes, WES has been extensively applied in research studies as well as for diagnostic utility to detect various novel genes and variants. The yield of WES critically depends on the characteristics of the patient population. Methods: In this study, we selected 8 unrelated Omani children, presenting with renal ciliopathy syndromes with a positive family history and originating from consanguineous families. We performed WES in affected children to determine the genetic cause of disease and to test the yield of this approach, coupled with homozygosity mapping, in this highly selected population. DNA library construction and WES was carried out using SureSelect Human All Exon V6 Enrichment Kit and Illumina HiSeq platform. For variants filtering and annotation Qiagen Variant Ingenuity tool was used. Nexus copy number software from BioDiscovery was used for evaluation of copy number variants and whole gene deletions. Patient and parental DNA was used to confirm mutations and the segregation of alleles using Sanger sequencing. Results: Genetic analysis identified 4 potential causative homozygous variants each confirmed by Sanger sequencing in 4 clinically relevant ciliopathy syndrome genes, ( TMEM231, TMEM138, WDR19 and BBS9), leading to an overall diagnostic yield of 50%. Conclusions: WES coupled with homozygosity mapping provided a diagnostic yield of 50% in this selected population. This genetic approach needs to be embedded into clinical practise to allow confirmation of clinical diagnosis, to inform genetic screening as well as family planning decisions. Half of the patients remain without diagnosis highlighting the technical and interpretational hurdles that need to be overcome in the future.


Publication metadata

Author(s): Al Alawi I, Al Riyami M, Barroso-Gil M, Powell L, Olinger E, Al Salmi I, Sayer JA

Publication type: Article

Publication status: Published

Journal: F1000Research

Year: 2021

Volume: 10

Online publication date: 12/03/2021

Acceptance date: 02/04/2020

Date deposited: 12/08/2021

ISSN (print): 2046-1402

ISSN (electronic): 1759-796X

Publisher: F1000 Research Ltd

URL: https://doi.org/10.12688/f1000research.40338.2

DOI: 10.12688/f1000research.40338.2


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