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 Genomicsjournal_title
BMC medical genomicsauthors
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,Abdalldoi
10.1186/s12920-020-00743-8subject
Has Abstractpub_date
2020-07-17 00:00:00pages
103issue
1issn
1755-8794pii
10.1186/s12920-020-00743-8journal_volume
13pub_type
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