Is RTEL1 p.Ser1203= (c.3609C>T) pathogenic?

RTEL1 p.Ser1203= (c.3609C>T) is classified Likely benign in RTEL1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-11-23). Very rare (popmax 0.00134%, afr); Associated with pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3.

How common is RTEL1 p.Ser1203= (c.3609C>T) in the general population?

RTEL1 p.Ser1203= (c.3609C>T) is very rare (popmax 0.00134%, afr) (gnomAD).

RTEL1 p.Ser1203=

Q: What condition is associated with RTEL1 p.Ser1203= (c.3609C>T)?

RTEL1 p.Ser1203= (c.3609C>T) is associated with pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3, dyskeratosis congenita, autosomal recessive 5 (ClinVar).

c.3609C>T · VCV4787833

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00134%, afr)

Conditions

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

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.1	GERP -2.6
Overall
CADD	1.167	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,420 alleles

Overall 0.000127% 2/1,574,504 alleles · very rare exomes 2/1,422,184 · genomes 0/152,320 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00134%	74,420
European (non-Finnish)	8.63e-05%	1,159,254

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.Ser1203=
Coding: c.3609C>T
MANE Select: NM_001283009
Type: single nucleotide variant
Location: chr20:63695437 (GRCh38)
Gene constraint: LOEUF 0.661 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.64 · 3 PDB
Residue 1203: the 'disordered' region

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

Disease context

pulmonary fibrosis and/or bone marrow failure, Telomere-related, 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dyskeratosis congenita, autosomal recessive 5

Similar variants

RTEL1 p.Ser1203Ile Uncertain significance ★★ ⚠ same residue
RTEL1 p.Ser1203Thr Uncertain significance ★★ ⚠ 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

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-ser1203 (accessed [today's date]).

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