1. Categorized Genetic Analysis in Childhood-Onset Cardiomyopathy
- Author
-
Ali Al Asmari, Maarab Alkorashy, Nawal Azhari, Zarghuna M.A. Shinwari, Mohammed Alhabdan, Saud Takroni, Walaa Alshuaibi, Sameera Sogaty, Ali Awaji, Faten Alhadeq, Aisha Alqahtani, Abdullah Alqwaee, Abduljabbar Alshenqiti, Ahmed Alomrani, Raghad Z. Al-Hassnan, Nadiah Alruwaili, Zuhair N. Al-Hassnan, Amal Alhashem, Fadel Al-Fadley, Waleed Al-Manea, Sahar Tulbah, Abdullah Alwadai, Abdulrahman Almesned, Malak Alghamdi, Majid Al-Fayyadh, Abdulrahman M. Bakhaider, Buthaina Albash, Dimpna C. Albert Brotons, Eissa Faqeih, Ahmad M. Al-Rashdan, Ali A. Al-Akhfash, Monther Rbabeh, Zainab Al humaidi, and Salwa M. Alkhalifi
- Subjects
Male ,0301 basic medicine ,Adolescent ,Cardiomyopathy ,Consanguinity ,030204 cardiovascular system & hematology ,Biology ,Genome ,Genetic analysis ,L-Aminoadipate-Semialdehyde Dehydrogenase ,03 medical and health sciences ,0302 clinical medicine ,Exome Sequencing ,medicine ,Humans ,Genetic Testing ,Child ,Founder mutation ,Exome ,Genetics ,Heterogeneous group ,Homozygote ,Infant, Newborn ,Infant ,General Medicine ,medicine.disease ,Pedigree ,DNA-Binding Proteins ,030104 developmental biology ,Child, Preschool ,Female ,Cardiomyopathies ,Acetyl-CoA Carboxylase ,Transcription Factors - Abstract
Background: Childhood-onset cardiomyopathy is a heterogeneous group of conditions the cause of which is largely unknown. The influence of consanguinity on the genetics of cardiomyopathy has not been addressed at a large scale. Methods: To unravel the genetic cause of childhood-onset cardiomyopathy in a consanguineous population, a categorized approach was adopted. Cases with childhood-onset cardiomyopathy were consecutively recruited. Based on the likelihood of founder mutation and on the clinical diagnosis, genetic test was categorized to either (1) targeted genetic test with targeted mutation test, single-gene test, or multigene panel for Noonan syndrome, or (2) untargeted genetic test with whole-exome sequencing or whole-genome sequencing. Several bioinformatics tools were used to filter the variants. Results: Two-hundred five unrelated probands with various forms of cardiomyopathy were evaluated. The median age of presentation was 10 months. In 30.2% (n=62), targeted genetic test had a yield of 82.7% compared with 33.6% for whole-exome sequencing/whole-genome sequencing (n=143) giving an overall yield of 53.7%. Strikingly, 96.4% of the variants were homozygous, 9% of which were found in 4 dominant genes. Homozygous variants were also detected in 7 novel candidates ( ACACB, AASDH, CASZ1, FLII, RHBDF1, RPL3L, ULK1 ). Conclusions: Our work demonstrates the impact of consanguinity on the genetics of childhood-onset cardiomyopathy, the value of adopting a categorized population-sensitive genetic approach, and the opportunity of uncovering novel genes. Our data suggest that if a founder mutation is not suspected, adopting whole-exome sequencing/whole-genome sequencing as a first-line test should be considered.
- Published
- 2020
- Full Text
- View/download PDF