Is TMC8 p.Phe435Cys (c.1304T>G) pathogenic?

TMC8 p.Phe435Cys (c.1304T>G) is classified Uncertain significance in TMC8 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-10-17). AlphaMissense: ambiguous (0.4232); Very rare (popmax 0.000169%, nfe); Associated with epidermodysplasia verruciformis.

What condition is associated with TMC8 p.Phe435Cys (c.1304T>G)?

TMC8 p.Phe435Cys (c.1304T>G) is associated with epidermodysplasia verruciformis (ClinVar).

How common is TMC8 p.Phe435Cys (c.1304T>G) in the general population?

TMC8 p.Phe435Cys (c.1304T>G) is very rare (popmax 0.000169%, nfe) (gnomAD).

How is Inherited epidermodysplasia verruciformis inherited?

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

What do computational predictors say about TMC8 p.Phe435Cys (c.1304T>G)?

AlphaMissense predicts ambiguous (score 0.4232) — an in-silico prediction, not a clinical call.

TMC8 p.Phe435Cys

c.1304T>G · rs2075271531 · VCV1346671

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4232 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000169%, nfe)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense indeterminate

Conditions

epidermodysplasia verruciformis

Computational evidence

Protein change
AlphaMissense	0.4232	ambiguous
REVEL	0.68	pathogenic-leaning
SaProt	LLR -9.20	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6	GERP 1.9, phastCons 1
Regional constraint	o/e 0.97	unconstrained · MANE · 9,520 bp · p 0.44 · regional, not allelic
Overall
CADD	26.5	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000169% European (non-Finnish) · 2/1,180,016 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000124% 2/1,613,464 alleles · very rare exomes 1/1,461,332 · genomes 1/152,132 · joint denominator

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.Phe435Cys
Coding: c.1304T>G
MANE Select: NM_152468
dbSNP: rs2075271531
Type: single nucleotide variant
Location: chr17:78137769 (GRCh38)
Gene constraint: LOEUF 1.201 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 76.77
Residue 435: 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 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
TMC8 p.Ala316Thr Uncertain significance ★★ ⚠ same condition
TMC8 p.Ala345Thr 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-phe435cys (accessed [today's date]).

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