De novo substitutions of TRPM3 cause intellectual disability and epilepsy

David A. Dyment, Paulien A. Terhal, Cecilie F. Rustad, Kristian Tveten, Christopher Griffith, Parul Jayakar, Marwan Shinawi, Sara Ellingwood, Rosemarie Smith, Koen van Gassen, Kirsty McWalter, A. Micheil Innes, Matthew A. Lines

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The developmental and epileptic encephalopathies (DEE) are a heterogeneous group of chronic encephalopathies frequently associated with rare de novo nonsynonymous coding variants in neuronally expressed genes. Here, we describe eight probands with a DEE phenotype comprising intellectual disability, epilepsy, and hypotonia. Exome trio analysis showed de novo variants in TRPM3, encoding a brain-expressed transient receptor potential channel, in each. Seven probands were identically heterozygous for a recurrent substitution, p.(Val837Met), in TRPM3’s S4–S5 linker region, a conserved domain proposed to undergo conformational change during gated channel opening. The eighth individual was heterozygous for a proline substitution, p.(Pro937Gln), at the boundary between TRPM3’s flexible pore-forming loop and an adjacent alpha-helix. General-population truncating variants and microdeletions occur throughout TRPM3, suggesting a pathomechanism other than simple haploinsufficiency. We conclude that de novo variants in TRPM3 are a cause of intellectual disability and epilepsy.

Original languageEnglish
Pages (from-to)1611-1618
Number of pages8
JournalEuropean Journal of Human Genetics
Issue number10
StatePublished - Oct 1 2019


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