Is TERT p.Pro174= (c.522G>C) pathogenic?

TERT p.Pro174= (c.522G>C) is classified Likely benign in TERT (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-12-31). Very rare (popmax 6.35e-05%); Associated with idiopathic pulmonary fibrosis.

What condition is associated with TERT p.Pro174= (c.522G>C)?

TERT p.Pro174= (c.522G>C) is associated with idiopathic pulmonary fibrosis, dyskeratosis congenita, autosomal dominant 2, dyskeratosis congenita (ClinVar).

How common is TERT p.Pro174= (c.522G>C) in the general population?

TERT p.Pro174= (c.522G>C) is very rare (popmax 6.35e-05%) (gnomAD).

How is Idiopathic pulmonary fibrosis inherited?

Typically Multigenic/multifactorial (Orphanet). A genetic counselor can assess individual risk for a family.

TERT p.Pro174=

c.522G>C · rs773784305 · VCV1571967

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 6.35e-05%)

Conditions

idiopathic pulmonary fibrosis

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -4.3	GERP -8.4
Overall
CADD	1.557	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 6.35e-05%

Overall 6.35e-05% 1/1,575,224 alleles · very rare exomes 1/1,422,880 · genomes 0/152,344 · 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: TERT
Protein: p.Pro174=
Coding: c.522G>C
MANE Select: NM_198253
dbSNP: rs773784305
Type: single nucleotide variant
Location: chr5:1294364 (GRCh38)
Gene constraint: LOEUF 0.593 · pLI <0.01 · ClinGen HI 1/3 (gnomAD)
Structure: AlphaFold pLDDT 80.98 · 32 PDB
Residue 174: the 'rna-interacting domain 1' region; the 'gq motif' region

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

Disease context

idiopathic pulmonary fibrosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dyskeratosis congenita, autosomal dominant 2 dyskeratosis congenita

For Idiopathic pulmonary fibrosis (Orphanet):

Inheritance: Multigenic/multifactorial
Onset: Adult
Prevalence: 1-5 / 10 000 (Worldwide)

Similar variants

TERT p.Pro174_Thr182dup 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
TERT p.Ala1009Val Likely pathogenic ★★ same condition
TERT p.Ala716Thr 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-pro174 (accessed [today's date]).

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