Is POT1 p.Ser45Ter (c.134C>G) pathogenic?

POT1 p.Ser45Ter (c.134C>G) is classified Pathogenic in POT1 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-07). Absent from gnomAD v4.1; Associated with tumor predisposition syndrome 3.

What condition is associated with POT1 p.Ser45Ter (c.134C>G)?

POT1 p.Ser45Ter (c.134C>G) is associated with tumor predisposition syndrome 3 (ClinVar).

How common is POT1 p.Ser45Ter (c.134C>G) in the general population?

POT1 p.Ser45Ter (c.134C>G) is absent from gnomAD v4.1 (gnomAD).

POT1 p.Ser45Ter

c.134C>G · VCV4691783

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

tumor predisposition syndrome 3

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 7 of 19
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.9, phastCons 1
Overall
CADD	38.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: POT1
Protein: p.Ser45Ter
Coding: c.134C>G
MANE Select: NM_015450
Type: single nucleotide variant
Location: chr7:124871032 (GRCh38)
Gene constraint: LOEUF 0.871 · pLI <0.01 · ClinGen HI 2/3 (gnomAD)
Structure: AlphaFold pLDDT 87.63 · 14 PDB
Residue 45: the 'dna-binding' region; a β-strand

Full POT1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

tumor predisposition syndrome 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

POT1 p.Ser45Pro Uncertain significance ★★ ⚠ same residue
POT1 p.Ser45= Likely benign ★ same residue
POT1 c.10-2A>C Pathogenic/Likely pathogenic ★★ same condition
POT1 c.1163+1G>A Likely pathogenic ★★ same condition
POT1 c.1164-1G>A Pathogenic/Likely pathogenic ★★ same condition
POT1 c.124+1G>C Pathogenic/Likely pathogenic ★★ same condition
POT1 c.124+2T>C Likely pathogenic ★★ same condition
POT1 c.125-2A>G 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/pot1-p-ser45ter (accessed [today's date]).

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