Is ATRX p.Ser558Arg (c.1674T>A) pathogenic?

ATRX p.Ser558Arg (c.1674T>A) is classified Uncertain significance in ATRX (ClinVar, Single submitter, 1 submitter; last evaluated 2018-04-28). AlphaMissense: likely benign (0.1614); Very rare (popmax 0.000223%, nfe); Associated with alpha thalassemia-X-linked intellectual disability syndrome.

What condition is associated with ATRX p.Ser558Arg (c.1674T>A)?

ATRX p.Ser558Arg (c.1674T>A) is associated with alpha thalassemia-X-linked intellectual disability syndrome (ClinVar).

How common is ATRX p.Ser558Arg (c.1674T>A) in the general population?

ATRX p.Ser558Arg (c.1674T>A) is very rare (popmax 0.000223%, nfe) (gnomAD).

What do computational predictors say about ATRX p.Ser558Arg (c.1674T>A)?

AlphaMissense predicts likely benign (score 0.1614) — an in-silico prediction, not a clinical call.

ATRX p.Ser558Arg

c.1674T>A · rs1569539199 · VCV582696

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1614 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000223%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

alpha thalassemia-X-linked intellectual disability syndrome

Computational evidence

Protein change
AlphaMissense	0.1614	likely benign
REVEL	0.122	moderately benign-leaning
SaProt	LLR -7.57	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 2	GERP 0.17, phastCons 0.95
Regional constraint	o/e 1.31	unconstrained · MANE · 2,828 bp · p 3.3e-15 · regional, not allelic
Overall
CADD	11.2	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 0.000223% European (non-Finnish) · 2/894,998 alleles

Filtering AF 3.7e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.4e-05%

Overall 0.000165% 2/1,210,654 alleles · very rare exomes 2/1,097,615 · genomes 0/113,039 · 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: ATRX
Protein: p.Ser558Arg
Coding: c.1674T>A
MANE Select: NM_000489
dbSNP: rs1569539199
Type: single nucleotide variant
Location: chrX:77683582 (GRCh38)
Structure: AlphaFold pLDDT 52.40 · 13 PDB
Residue 558: the 'disordered' region

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

Disease context

alpha thalassemia-X-linked intellectual disability syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ATRX p.Ser558Gly Uncertain significance ⚠ same residue
ATRX c.5449-7A>G Likely pathogenic ★★ same condition
ATRX p.Arg1022Ter Pathogenic/Likely pathogenic ★★ same condition
ATRX p.Arg1661Cys Likely pathogenic ★★ ⚠ same condition
ATRX p.Arg2085Cys Pathogenic/Likely pathogenic ★★ same condition
ATRX p.Arg2085His Pathogenic/Likely pathogenic ★★ same condition
ATRX p.Arg2131Gln Pathogenic/Likely pathogenic ★★ same condition
ATRX p.Arg2178Trp Pathogenic/Likely pathogenic ★★ 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/atrx-p-ser558arg (accessed [today's date]).

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