Is FTCD p.Arg470Trp (c.1408C>T) pathogenic?

FTCD p.Arg470Trp (c.1408C>T) is classified Uncertain significance in FTCD (ClinVar, Single submitter, 1 submitter; last evaluated 2023-09-14). AlphaMissense: likely benign (0.0942); Ultra-rare (popmax 0.0135%, eas); Associated with Inborn genetic diseases.

What condition is associated with FTCD p.Arg470Trp (c.1408C>T)?

FTCD p.Arg470Trp (c.1408C>T) is associated with Inborn genetic diseases (ClinVar).

How common is FTCD p.Arg470Trp (c.1408C>T) in the general population?

FTCD p.Arg470Trp (c.1408C>T) is ultra-rare (popmax 0.0135%, eas) (gnomAD).

What do computational predictors say about FTCD p.Arg470Trp (c.1408C>T)?

AlphaMissense predicts likely benign (score 0.0942) — an in-silico prediction, not a clinical call.

FTCD p.Arg470Trp

c.1408C>T · rs199807194 · VCV2594366

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0942 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0135%, eas)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0942	likely benign
REVEL	0.131	moderately benign-leaning
SaProt	LLR -11.40	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>T here scores Δ0.72 · evaluated, not missing
Constraint at this position
Conservation	phyloP 1.2	GERP -2.1, phastCons 0.001
Regional constraint	o/e 1.12	unconstrained · MANE · 19 kb · p 0.00063 · regional, not allelic
Overall
CADD	22.5	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 0.0135% East Asian · 6/44,282 alleles

Filtering AF 0.00585% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00398%

Overall 0.0034% 54/1,586,614 alleles · ultra-rare exomes 42/1,434,346 · genomes 12/152,268 · joint denominator

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.0206%	4,859
East Asiangrpmax	0.0135%	7,380
African / African-American	0.0107%	9,353
Admixed American	0.00869%	11,504
Remaining individualsnot grpmax-eligible	0.00811%	12,335
South Asian	0.00339%	29,524
Finnishnot grpmax-eligible	0.00196%	51,064
European (non-Finnish)	0.0017%	58,671

Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: FTCD
Protein: p.Arg470Trp
Coding: c.1408C>T
MANE Select: NM_206965
dbSNP: rs199807194
Type: single nucleotide variant
Location: chr21:46138543 (GRCh38)
Gene constraint: LOEUF 1.61 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 95.30
Residue 470: the 'cyclodeaminase/cyclohydrolase' region

Full FTCD 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

FTCD p.Arg470Gln Likely benign ★★ same residue
FTCD p.Arg255Ter Pathogenic ★★ same condition
FTCD p.Ala108Thr Uncertain significance ★★ ⚠ same condition
FTCD p.Ala159Val Uncertain significance ★★ ⚠ same condition
FTCD p.Ala352Val Uncertain significance ★★ ⚠ same condition
FTCD p.Ala361Val Uncertain significance ★★ same condition
FTCD p.Ala418Thr Uncertain significance ★★ ⚠ same condition
FTCD p.Ala455Thr 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/ftcd-p-arg470trp (accessed [today's date]).

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