Is TERT p.Arg261= (c.783G>A) pathogenic?

TERT p.Arg261= (c.783G>A) is classified Likely benign in TERT (ClinVar, Multiple submitters, 2 submitters; last evaluated 2021-04-06). Very rare (popmax 0.000257%, nfe); Associated with dyskeratosis congenita, autosomal dominant 2.

What condition is associated with TERT p.Arg261= (c.783G>A)?

TERT p.Arg261= (c.783G>A) is associated with dyskeratosis congenita, autosomal dominant 2, dyskeratosis congenita, idiopathic pulmonary fibrosis (ClinVar).

How common is TERT p.Arg261= (c.783G>A) in the general population?

TERT p.Arg261= (c.783G>A) is very rare (popmax 0.000257%, nfe) (gnomAD).

How is Dyskeratosis congenita inherited?

Typically Autosomal dominant, Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

TERT p.Arg261=

c.783G>A · rs1286573582 · VCV1622562

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000257%, nfe)

Conditions

dyskeratosis congenita, autosomal dominant 2

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 0.26	GERP -0.019
Overall
CADD	3.861	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000257% European (non-Finnish) · 3/1,169,210 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000209% 3/1,434,852 alleles · very rare

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: TERT
Protein: p.Arg261=
Coding: c.783G>A
MANE Select: NM_198253
dbSNP: rs1286573582
Type: single nucleotide variant
Location: chr5:1294103 (GRCh38)
Gene constraint: LOEUF 0.593 · pLI <0.01 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 80.98 · 32 PDB
Residue 261: the 'disordered' region; the 'linker' region

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

Disease context

dyskeratosis congenita, autosomal dominant 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dyskeratosis congenita idiopathic pulmonary fibrosis

For Dyskeratosis congenita (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Adolescent, Adult, Childhood, Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

TERT p.Arg261Lys Uncertain significance ★★ ⚠ same residue
TERT p.Arg261Ser Uncertain significance ★★ ⚠ same residue
TERT p.Arg261Trp Uncertain significance ★★ ⚠ same residue
TERT c.2130+1G>A Likely pathogenic ★★ same condition
TERT c.2130+2T>G Likely pathogenic ★★ same condition
TERT c.2131-2A>G Likely pathogenic ★★ same condition
TERT c.2286+1G>A Likely pathogenic ★★ same condition
TERT c.3157+1G>T 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/tert-p-arg261 (accessed [today's date]).

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