Is TRPM4 p.Val118= (c.354G>A) pathogenic?

TRPM4 p.Val118= (c.354G>A) is classified Likely benign in TRPM4 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-05-07). Very rare (popmax 0.00167%, amr); Associated with progressive familial heart block type IB.

What condition is associated with TRPM4 p.Val118= (c.354G>A)?

TRPM4 p.Val118= (c.354G>A) is associated with progressive familial heart block type IB (ClinVar).

How common is TRPM4 p.Val118= (c.354G>A) in the general population?

TRPM4 p.Val118= (c.354G>A) is very rare (popmax 0.00167%, amr) (gnomAD).

TRPM4 p.Val118=

Q: How is Hereditary progressive cardiac conduction defect inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

c.354G>A · rs566463803 · VCV1356675

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

progressive familial heart block type IB

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.27	donor gain · deltas
Constraint at this position
Conservation	phyloP 6.3	phastCons 1
Overall
CADD	16.42	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/60,034 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000274% 4/1,461,480 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	60,034
European (non-Finnish)	0.000254%	393,331

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: TRPM4
Protein: p.Val118=
Coding: c.354G>A
MANE Select: NM_017636
dbSNP: rs566463803
Type: single nucleotide variant
Location: chr19:49168003 (GRCh38)
Gene constraint: LOEUF 1.084 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 78.51 · 42 PDB
Residue 118: a β-strand

Full TRPM4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

progressive familial heart block type IB — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Hereditary progressive cardiac conduction defect (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult

Similar variants

TRPM4 p.Ile1040Thr Pathogenic/Likely pathogenic ★★ same condition
TRPM4 p.Ile376Thr Pathogenic/Likely pathogenic ★★ ⚠ same condition
TRPM4 c.1050+1G>A Uncertain significance ★★ same condition
TRPM4 c.1150+5A>T Uncertain significance ★★ same condition
TRPM4 c.1150+6A>G Uncertain significance ★★ same condition
TRPM4 c.1263+1G>A Uncertain significance ★★ same condition
TRPM4 c.1263+2T>G Uncertain significance ★★ same condition
TRPM4 c.1608+1G>C Uncertain significance ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/trpm4-p-val118 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown