ClinVar Miner

Submissions for variant NM_000719.7(CACNA1C):c.1114-304G>C (rs786205745)

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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Blueprint Genetics RCV000208468 SCV000263796 pathogenic Timothy syndrome 2015-09-03 criteria provided, single submitter clinical testing
GeneDx RCV000170770 SCV000223325 pathogenic not provided 2018-07-03 criteria provided, single submitter clinical testing p.Gly406Arg (GGA>CGA): c.1216 G>C in exon 8 of the CACNA1C gene (NM_001167625.1). The Gly406Arg mutation in the CACNA1C gene has been reported in association with Timothy syndrome (Splawski I et al., 2004; Yarotskyy V et al., 2009). Splawski et al. reported Gly406Arg as a de novo mutation in 11 unrelated individuals with Timothy syndrome and additionally in two siblings that inherited Gly406Arg as a result of germline mosaicism (Splawski I et al., 2004). In this same study, Gly406Arg was absent in 360 control alleles and expression of the CACNA1C gene was found in multiple tissue types that correlate to the organ systems affected in Timothy syndrome. Furthermore, the Gly406 residue is highly conserved across species and functional studies identified that Gly406Arg has a significant effect on calcium ion channel currents leading to action potential prolongation (Splawski I et al., 2004). Moreover, the NHLBI Exome Variant Server reports Gly406Arg was not observed in approximately 6,000 samples from individuals of European and African American backgrounds, indicating it is not a common benign variant in these populations.In summary, Gly406Arg in the CACNA1C gene is interpreted as a disease-causing mutation. The variant is found in LQT panel(s).

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