Post-mortem genetic analysis in juvenile cases of sudden cardiac death.
BACKGROUND
The reason behind a sudden death of a young individual remains unknown in up to 50% of postmortem cases. Pathogenic mutations in genes encoding heart proteins are known to cause sudden cardiac death.


OBJECTIVE
The aim of our study was to ascertain whether genetic alterations could provide an explanation for sudden cardiac death in a juvenile cohort with no-conclusive cause of death after comprehensive autopsy.


METHODS
Twenty-nine cases <15 years showing no-conclusive cause of death after a complete autopsy were studied. Genetic analysis of 7 main genes associated with sudden cardiac death was performed using Sanger technology in low quality DNA cases, while in good quality cases the analysis of 55 genes associated with sudden cardiac death was performed using Next Generation Sequencing technology.


RESULTS
Thirty-five genetic variants were identified in 12 cases (41.37%). Ten genetic/variants in genes encoding cardiac ion channels were identified in 8 cases (27.58%). We also identified 9 cases (31.03%) carrying 25 genetic variants in genes encoding structural cardiac proteins. Nine cases carried more than one genetic variation, 5 of them combining structural and non-structural genes.


CONCLUSIONS
Our study supports the inclusion of molecular autopsy in forensic routine protocols when no conclusive cause of death is identified. Around 40% of sudden cardiac death young cases carry a genetic variant that could provide an explanation for the cause of death. Because relatives could be at risk of sudden cardiac death, our data reinforce their need of clinical assessment and, if indicated, of genetic analysis.
['Campuzano|Oscar|O|', 'Sanchez-Molero|Olallo|O|', 'Allegue|Catarina|C|', 'Coll|Monica|M|', 'Mademont-Soler|Irene|I|', 'Selga|Elisabet|E|', 'Ferrer-Costa|Carles|C|', 'Mates|Jesus|J|', 'Iglesias|Anna|A|', 'Sarquella-Brugada|Georgia|G|', 'Cesar|Sergi|S|', 'Brugada|Josep|J|', 'Castellà|Josep|J|', 'Medallo|Jordi|J|', 'Brugada|Ramon|R|']
D002648:Child D002675:Child, Preschool D004247:DNA D016757:Death, Sudden, Cardiac D005260:Female D053803:Forensic Genetics D005820:Genetic Testing D014644:Genetic Variation D006331:Heart Diseases D059014:High-Throughput Nucleotide Sequencing D006801:Humans D007223:Infant D007231:Infant, Newborn D008297:Male D017422:Sequence Analysis, DNA
Genetics Sudden cardiac death Next Generation Sequencing Forensics Adolescent Paediatric