Is RTEL1 p.Arg324Cys (c.970C>T) pathogenic?

RTEL1 p.Arg324Cys (c.970C>T) is classified Uncertain significance in RTEL1 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-08-15). AlphaMissense: likely benign (0.0846); Very rare (popmax 0.00668%, afr); Associated with dyskeratosis congenita, autosomal recessive 5.

What condition is associated with RTEL1 p.Arg324Cys (c.970C>T)?

RTEL1 p.Arg324Cys (c.970C>T) is associated with dyskeratosis congenita, autosomal recessive 5, pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3 (ClinVar).

How common is RTEL1 p.Arg324Cys (c.970C>T) in the general population?

RTEL1 p.Arg324Cys (c.970C>T) is very rare (popmax 0.00668%, afr) (gnomAD).

What do computational predictors say about RTEL1 p.Arg324Cys (c.970C>T)?

AlphaMissense predicts likely benign (score 0.0846) — an in-silico prediction, not a clinical call.

RTEL1 p.Arg324Cys

c.970C>T · rs771452777 · VCV1370422

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0846 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00668%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

dyskeratosis congenita, autosomal recessive 5

Computational evidence

Protein change
AlphaMissense	0.0846	likely benign
REVEL	0.528	indeterminate
SaProt	LLR -8.32	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.9	GERP 1.3, phastCons 0.67
Regional constraint	o/e 0.86	unconstrained · MANE · 31 kb · p 1.3e-05 · regional, not allelic
Overall
CADD	24.2	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 0.00668% African / African-American · 5/74,854 alleles

Filtering AF 0.00255% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00162%

Overall 0.000682% 11/1,612,134 alleles · very rare exomes 8/1,460,072 · genomes 3/152,062 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00668%	14,971
East Asian	0.00223%	44,836
European (non-Finnish)	0.000424%	235,793

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: RTEL1
Protein: p.Arg324Cys
Coding: c.970C>T
MANE Select: NM_001283009
dbSNP: rs771452777
Type: single nucleotide variant
Location: chr20:63678279 (GRCh38)
Gene constraint: LOEUF 0.661 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.64 · 3 PDB

Full RTEL1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

dyskeratosis congenita, autosomal recessive 5 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3

Similar variants

RTEL1 p.Arg324= Likely benign ★★ same residue
RTEL1 c.1037+1G>T Likely pathogenic ★★ same condition
RTEL1 c.1192-2A>G Likely pathogenic ★★ same condition
RTEL1 c.1596-1G>A Likely pathogenic ★★ same condition
RTEL1 c.2142-1G>C Likely pathogenic ★★ same condition
RTEL1 c.2265+1G>T Likely pathogenic ★★ same condition
RTEL1 c.2413+1G>A Likely pathogenic ★★ same condition
RTEL1 c.2413+1G>C 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/rtel1-p-arg324cys (accessed [today's date]).

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