期刊
CIRCULATION-GENOMIC AND PRECISION MEDICINE
卷 14, 期 1, 页码 -出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCGEN.120.003131
关键词
cardiomyopathies; exome; genetic testing; incidental findings; population
资金
- National Institutes of Health (NIH) [K08HL136839, R38-HL143612]
- Pediatric and Congenital Electrophysiology Society Paul C. Gillette Award
- Baylor College of Medicine Department of Pediatrics
- Duke University School of Medicine
- Duke Pediatric Research Scholars Program
Incidentally found TTNtvs are common in clinical exome sequencing referrals, with pathological hotspots within the A-band of TTN that may help determine variant pathogenicity.
Background: TTN, the largest gene in the human body, encodes TTN (titin), a protein that plays key structural, developmental, and regulatory roles in skeletal and cardiac muscle. Variants in TTN, particularly truncating variants (TTNtvs), have been implicated in the pathogenicity of cardiomyopathy. Despite this link, there is also a high burden of TTNtvs in the ostensibly healthy general population. This complicates the diagnostic interpretation of incidentally identified TTNtvs, which are of increasing abundance given expanding clinical exome sequencing. Methods: Incidentally identified TTNtvs were obtained from a large referral database of clinical exome sequencing (Baylor Genetics) and compared with rare population variants from genome aggregation database and cardiomyopathy-associated variants from cohort studies in the literature. A subset of TTNtv-positive children evaluated for cardiomyopathy at Texas Children's Hospital was retrospectively reviewed for clinical features of cardiomyopathy. Amino acid-level signal-to-noise analysis was performed. Results: Pathological hotspots were identified within the A-band and N-terminal I-band that closely correlated with regions of high percent-spliced in of exons. Incidental TTNtvs and population TTNtvs did not localize to these regions. Variants were reclassified based on current American College of Medical Genetics and Genomics criteria with incorporation of signal-to-noise analysis among Texas Children's Hospital cases. Those reclassified as likely pathogenic or pathogenic were more likely to have evidence of cardiomyopathy on echocardiography than those reclassified as variants of unknown significance. Conclusions: Incidentally found TTNtvs are common among clinical exome sequencing referrals. Pathological hotspots within the A-band of TTN may be informative in determining variant pathogenicity when incorporated into current American College of Medical Genetics and Genomics guidelines.
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