Is ENPP3 p.Ser420Pro (c.1258T>C) pathogenic?

ENPP3 p.Ser420Pro (c.1258T>C) is classified Uncertain significance in ENPP3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-11-07). AlphaMissense: likely benign (0.1412); Absent from gnomAD v4.1.

How common is ENPP3 p.Ser420Pro (c.1258T>C) in the general population?

ENPP3 p.Ser420Pro (c.1258T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ENPP3 p.Ser420Pro (c.1258T>C)?

AlphaMissense predicts likely benign (score 0.1412) — an in-silico prediction, not a clinical call.

ENPP3 p.Ser420Pro

c.1258T>C · VCV4664392

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1412 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 960,312)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1412	likely benign
REVEL	0.253	benign-leaning
SaProt	LLR -8.27	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 5	GERP 1.6, phastCons 1
Regional constraint	o/e 0.98	unconstrained · MANE · 110 kb · p 0.42 · regional, not allelic
Overall
CADD	22.2	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 960,312). 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: ENPP3
Protein: p.Ser420Pro
Coding: c.1258T>C
MANE Select: NM_005021
Type: single nucleotide variant
Location: chr6:131685881 (GRCh38)
Gene constraint: LOEUF 1.211 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 95.50 · 3 PDB
Residue 420: an α-helix; a disulfide bond; the 'phosphodiesterase' region

Full ENPP3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ENPP3 c.762+4T>C Likely benign ★★ same type
CTAGE9 p.Ala668Thr Uncertain significance ★ ⚠ same type
CTAGE9 p.Asp478Tyr Uncertain significance ★ ⚠ same type
CTAGE9 p.Glu332Lys Uncertain significance ★ ⚠ same type
CTAGE9 p.Glu414Asp Uncertain significance ★ ⚠ same type
CTAGE9 p.Ile207Thr Uncertain significance ★ ⚠ same type
ENPP3 p.Ala248Asp Uncertain significance ★ ⚠ same type
ENPP3 p.Ala330Pro Uncertain significance ★ ⚠ same type

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/enpp3-p-ser420pro (accessed [today's date]).

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