Is TMC8 p.Val390= (c.1170C>T) pathogenic?

TMC8 p.Val390= (c.1170C>T) is classified Likely benign in TMC8 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-17). Very rare (popmax 0.004%, afr); Associated with epidermodysplasia verruciformis.

What condition is associated with TMC8 p.Val390= (c.1170C>T)?

TMC8 p.Val390= (c.1170C>T) is associated with epidermodysplasia verruciformis (ClinVar).

How common is TMC8 p.Val390= (c.1170C>T) in the general population?

TMC8 p.Val390= (c.1170C>T) is very rare (popmax 0.004%, afr) (gnomAD).

How is Inherited epidermodysplasia verruciformis inherited?

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

TMC8 p.Val390=

c.1170C>T · VCV3704265

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Conditions

epidermodysplasia verruciformis

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 3.1	GERP 0.55, phastCons 1
Overall
CADD	7.369	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.004% African / African-American · 3/75,040 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000494%

Overall 0.000372% 6/1,614,010 alleles · very rare exomes 6/1,461,702 · genomes 0/152,308 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.004%	25,013
Remaining individualsnot grpmax-eligible	0.0032%	31,249
European (non-Finnish)	8.47e-05%	1,180,025

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: TMC8
Protein: p.Val390=
Coding: c.1170C>T
MANE Select: NM_152468
Type: single nucleotide variant
Location: chr17:78137277 (GRCh38)
Gene constraint: LOEUF 1.201 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 76.77
Residue 390: the 'tmc domain' region; a UniProt-annotated variant site (in ev2)

Full TMC8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

epidermodysplasia verruciformis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Inherited epidermodysplasia verruciformis (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages

Similar variants

TMC8 p.Val390Ile Conflicting classifications of pathogenicity ★ ⚠ same residue
TMC8 p.Val390Leu Uncertain significance ★ ⚠ same residue
TMC8 c.1824-1G>C Pathogenic/Likely pathogenic ★★ same condition
TMC8 c.449-1G>T Likely pathogenic ★★ same condition
TMC8 p.Arg190Ter Pathogenic ★★ same condition
TMC8 p.Ala188Val Uncertain significance ★★ ⚠ same condition
TMC8 p.Ala290Thr Uncertain significance ★★ ⚠ same condition
TMC8 p.Ala313Val 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/tmc8-p-val390 (accessed [today's date]).

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