Is TRPM4 p.Pro45= (c.135C>T) pathogenic?

TRPM4 p.Pro45= (c.135C>T) is classified Likely benign in TRPM4 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-09-06). Very rare (popmax 0.00224%, sas); Associated with progressive familial heart block type IB.

What condition is associated with TRPM4 p.Pro45= (c.135C>T)?

TRPM4 p.Pro45= (c.135C>T) is associated with progressive familial heart block type IB (ClinVar).

How common is TRPM4 p.Pro45= (c.135C>T) in the general population?

TRPM4 p.Pro45= (c.135C>T) is very rare (popmax 0.00224%, sas) (gnomAD).

TRPM4 p.Pro45=

Q: How is Hereditary progressive cardiac conduction defect inherited?

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

c.135C>T · rs1448432872 · VCV2917976

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00224%, sas)

Conditions

progressive familial heart block type IB

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -7.2
Overall
CADD	0.147	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00224% South Asian · 2/89,302 alleles

Filtering AF 0.000372% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000159%

Overall 0.000624% 10/1,602,688 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00224%	44,651
Admixed American	0.00172%	57,976
European (non-Finnish)	0.000595%	167,996

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.Pro45=
Coding: c.135C>T
MANE Select: NM_017636
dbSNP: rs1448432872
Type: single nucleotide variant
Location: chr19:49166083 (GRCh38)
Gene constraint: LOEUF 1.084 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 78.51 · 42 PDB

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-pro45 (accessed [today's date]).

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