Is TERT p.Pro703Arg (c.2108C>G) pathogenic?

TERT p.Pro703Arg (c.2108C>G) is classified Uncertain significance in TERT (ClinVar, Single submitter, 1 submitter; last evaluated 2026-06-13). AlphaMissense: likely benign (0.0746); Absent from gnomAD v4.1; Associated with dyskeratosis congenita.

What condition is associated with TERT p.Pro703Arg (c.2108C>G)?

TERT p.Pro703Arg (c.2108C>G) is associated with dyskeratosis congenita (ClinVar).

How common is TERT p.Pro703Arg (c.2108C>G) in the general population?

TERT p.Pro703Arg (c.2108C>G) is absent from gnomAD v4.1 (gnomAD).

How is Dyskeratosis congenita inherited?

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

What do computational predictors say about TERT p.Pro703Arg (c.2108C>G)?

AlphaMissense predicts likely benign (score 0.0746) — an in-silico prediction, not a clinical call.

TERT p.Pro703Arg

c.2108C>G · VCV4865493

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0746 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,584,178)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

dyskeratosis congenita

Computational evidence

Protein change
AlphaMissense	0.0746	likely benign
REVEL	0.231	benign-leaning
SaProt	LLR -7.15	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.68	GERP -2.5
Regional constraint	o/e 0.58	unconstrained · MANE · 29 kb · p 2.3e-32 · regional, not allelic
Overall
CADD	2.12	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

No allele count reported in gnomAD v4.1 (AN 1,584,178). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: TERT
Protein: p.Pro703Arg
Coding: c.2108C>G
MANE Select: NM_198253
Type: single nucleotide variant
Location: chr5:1279313 (GRCh38)
Gene constraint: LOEUF 0.593 · pLI <0.01 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 80.98 · 32 PDB
Residue 703: the reverse transcriptase domain; an α-helix

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

Disease context

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

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.Pro703= Likely benign ★★ same residue
TERT p.Pro703Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
TERT p.Pro703Ser Uncertain significance ★ ⚠ same residue
TERT c.2286+1G>A Likely pathogenic ★★ same condition
TERT p.Ala716Val Pathogenic/Likely pathogenic ★★ same condition
TERT p.Arg230Ter Pathogenic ★★ same condition
TERT p.Arg631Gln Pathogenic ★★ same condition
TERT p.Arg631Trp 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/tert-p-pro703arg (accessed [today's date]).

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