CACNA1C-related disorders
CACNA1C-related disorders are a group of rare diseases caused by variants in the CACNA1C gene, which encodes a subunit of the L-type voltage-dependent calcium channel. Genomic sequencing has linked a number of heterogenous phenotypes to pathogenic variants in the CACNA1C gene:

 Timothy syndrome, which may or may not occur with syndactyly
 Short QT syndrome or Brugada syndrome
 Long QT syndrome or other arrhythmia without additional symptoms. CACNA1C-related disorders are inherited in an autosomal dominant manner. Symptoms of CACNA1C-related disorders are primarily neurological and may include developmental delay, autism or autistic features, and seizures. Facial dysmorphism may also be present. References 

Genetic diseases and disorders