Timothy syndrome and CACNA1C-Related Disorder: first international language and management guidelines consensus statement.

CACNA1C variants (Cav1.2 calcium channel) — harmonized nomenclature and management by consensus

Timothy syndrome, a multisystem disorder, classically combines long QT, arrhythmias, neurodevelopmental disorders and syndactyly, and results from CACNA1C variants encoding the Cav1.2 calcium channel. Expanded sequencing has revealed incomplete or related presentations described under ill-defined terms (for example atypical Timothy syndrome). An international expert panel proposes, via Delphi consensus with community involvement, a formalized nomenclature distinguishing classic Timothy syndrome from CACNA1C-related disorder. Minimum standards of clinical care and long-term follow-up are established.

Synthesis written by Geno'X. For the full original abstract, please refer to the source publication.

A useful consensus clarifying a nosology that had become confused with expanded sequencing, a genuine need for counseling and follow-up. Its value is essentially normative and organizational rather than data-driven. Harmonized language will ease interpretation of CACNA1C variants found incidentally on WES/WGS.

Analysis by Dr Thibaut Benquey