What is the right sequencing approach? Solo VS extended family analysis in consanguineous populations.

Abstract:

BACKGROUND:Testing strategies is crucial for genetics clinics and testing laboratories. In this study, we tried to compare the hit rate between solo and trio and trio plus testing and between trio and sibship testing. Finally, we studied the impact of extended family analysis, mainly in complex and unsolved cases. METHODS:Three cohorts were used for this analysis: one cohort to assess the hit rate between solo, trio and trio plus testing, another cohort to examine the impact of the testing strategy of sibship genome vs trio-based analysis, and a third cohort to test the impact of an extended family analysis of up to eight family members to lower the number of candidate variants. RESULTS:The hit rates in solo, trio and trio plus testing were 39, 40, and 41%, respectively. The total number of candidate variants in the sibship testing strategy was 117 variants compared to 59 variants in the trio-based analysis. We noticed that the average number of coding candidate variants in trio-based analysis was 1192 variants and 26,454 noncoding variants, and this number was lowered by 50-75% after adding additional family members, with up to two coding and 66 noncoding homozygous variants only, in families with eight family members. CONCLUSION:There was no difference in the hit rate between solo and extended family members. Trio-based analysis was a better approach than sibship testing, even in a consanguineous population. Finally, each additional family member helped to narrow down the number of variants by 50-75%. Our findings could help clinicians, researchers and testing laboratories select the most cost-effective and appropriate sequencing approach for their patients. Furthermore, using extended family analysis is a very useful tool for complex cases with novel genes.

journal_name

BMC Med Genomics

journal_title

BMC medical genomics

authors

Alfares A,Alsubaie L,Aloraini T,Alaskar A,Althagafi A,Alahmad A,Rashid M,Alswaid A,Alothaim A,Eyaid W,Ababneh F,Albalwi M,Alotaibi R,Almutairi M,Altharawi N,Alsamer A,Abdelhakim M,Kafkas S,Mineta K,Cheung N,Abdall

doi

10.1186/s12920-020-00743-8

subject

Has Abstract

pub_date

2020-07-17 00:00:00

pages

103

issue

1

issn

1755-8794

pii

10.1186/s12920-020-00743-8

journal_volume

13

pub_type

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