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Lookup NU author(s): Intisar Al Alawi, Miguel Barroso Gil, Laura Powell, Dr Eric OlingerORCiD, Professor John SayerORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 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.
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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