Is ACD p.Pro270Leu (c.809C>T) pathogenic?

ACD p.Pro270Leu (c.809C>T) is classified Uncertain significance in ACD (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-07-29). AlphaMissense: likely benign (0.0895); Very rare (popmax 0.00271%, afr); Associated with dyskeratosis congenita, autosomal dominant 6.

What condition is associated with ACD p.Pro270Leu (c.809C>T)?

ACD p.Pro270Leu (c.809C>T) is associated with dyskeratosis congenita, autosomal dominant 6 (ClinVar).

How common is ACD p.Pro270Leu (c.809C>T) in the general population?

ACD p.Pro270Leu (c.809C>T) is very rare (popmax 0.00271%, afr) (gnomAD).

What do computational predictors say about ACD p.Pro270Leu (c.809C>T)?

AlphaMissense predicts likely benign (score 0.0895) — an in-silico prediction, not a clinical call.

ACD p.Pro270Leu

c.809C>T · rs1035052101 · VCV572998

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0895 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00271%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

dyskeratosis congenita, autosomal dominant 6

Computational evidence

Protein change
AlphaMissense	0.0895	likely benign
REVEL	0.049	moderately benign-leaning
SaProt	LLR -6.78	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	Δ0.22	acceptor gain · deltas
Pangolin	Δ0.20	loss · gain 0.07 · SpliceAI calls gain · independent
Constraint at this position
Conservation	phyloP 0.66	GERP -0.93, phastCons 0.009
Regional constraint	o/e 0.89	unconstrained · MANE · 2,611 bp · p 0.011 · regional, not allelic
Overall
CADD	16.05	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 0.00271% African / African-American · 2/73,914 alleles

Filtering AF 0.0016% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00137%

Overall 0.00191% 30/1,570,272 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00271%	36,957
European (non-Finnish)	0.00233%	42,849
Remaining individualsnot grpmax-eligible	0.00165%	60,494

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: ACD
Protein: p.Pro270Leu
Coding: c.809C>T
MANE Select: NM_001082486
dbSNP: rs1035052101
Type: single nucleotide variant
Location: chr16:67658575 (GRCh38)
Gene constraint: LOEUF 0.921 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 63.09 · 28 PDB
Residue 270: the 'disordered' region

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

Disease context

dyskeratosis congenita, autosomal dominant 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ACD p.Pro270del Uncertain significance ★ same residue
ACD p.Pro270Ser Uncertain significance ★ ⚠ same residue
ACD p.Pro270Thr Uncertain significance ★ ⚠ same residue
ACD c.645+2T>C Uncertain significance ★★ same condition
ACD c.99+5G>A Uncertain significance ★★ same condition
ACD c.-20C>T Uncertain significance ★★ same condition
ACD c.-24C>T Uncertain significance ★★ same condition
ACD c.-26T>G 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/acd-p-pro270leu (accessed [today's date]).

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