Is TBCD p.Ala887Val (c.2660C>T) pathogenic?

TBCD p.Ala887Val (c.2660C>T) is classified Uncertain significance in TBCD (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-25). AlphaMissense: likely benign (0.1246); Very rare (popmax 0.000509%, nfe); Associated with Inborn genetic diseases.

What condition is associated with TBCD p.Ala887Val (c.2660C>T)?

TBCD p.Ala887Val (c.2660C>T) is associated with Inborn genetic diseases (ClinVar).

How common is TBCD p.Ala887Val (c.2660C>T) in the general population?

TBCD p.Ala887Val (c.2660C>T) is very rare (popmax 0.000509%, nfe) (gnomAD).

What do computational predictors say about TBCD p.Ala887Val (c.2660C>T)?

AlphaMissense predicts likely benign (score 0.1246) — an in-silico prediction, not a clinical call.

TBCD p.Ala887Val

c.2660C>T · VCV4632741

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1246 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000509%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.1246	likely benign
REVEL	0.014	strongly benign-leaning
SaProt	LLR -4.35	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.12	GERP -3, phastCons 0.002
Regional constraint	o/e 0.90	unconstrained · MANE · 190 kb · p 9.5e-05 · regional, not allelic
Overall
CADD	1.094	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000509% European (non-Finnish) · 6/1,179,804 alleles

Filtering AF 0.000183% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00012%

Overall 0.000372% 6/1,613,016 alleles · very rare exomes 6/1,460,672 · genomes 0/152,344 · 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: TBCD
Protein: p.Ala887Val
Coding: c.2660C>T
MANE Select: NM_005993
Type: single nucleotide variant
Location: chr17:82927955 (GRCh38)
Gene constraint: LOEUF 0.763 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 90.45 · 6 PDB

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

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TBCD p.Ala415Val Uncertain significance ★★ ⚠ same condition
TBCD p.Ala599Thr Uncertain significance ★★ ⚠ same condition
TBCD p.Ala907Val Uncertain significance ★★ ⚠ same condition
TBCD p.Arg1107Thr 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/tbcd-p-ala887val (accessed [today's date]).

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