Is CSN2 p.His140Arg (c.419A>G) pathogenic?

CSN2 p.His140Arg (c.419A>G) is classified Uncertain significance in CSN2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-08). AlphaMissense: likely benign (0.1392); Absent from gnomAD v4.1.

How common is CSN2 p.His140Arg (c.419A>G) in the general population?

CSN2 p.His140Arg (c.419A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CSN2 p.His140Arg (c.419A>G)?

AlphaMissense predicts likely benign (score 0.1392) — an in-silico prediction, not a clinical call.

CSN2 p.His140Arg

c.419A>G · VCV4235142

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1392 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1392	likely benign
REVEL	0.032	moderately benign-leaning
SaProt	LLR -6.10	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 -0.76	GERP -3.3
Regional constraint	o/e 1.26	unconstrained · MANE · 4,642 bp · p 2.6e-05 · regional, not allelic
Overall
CADD	4.924	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

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: CSN2
Protein: p.His140Arg
Coding: c.419A>G
MANE Select: NM_001891
Type: single nucleotide variant
Location: chr4:69957530 (GRCh38)
Gene constraint: LOEUF 1.168 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 60.09

Full CSN2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CSN2 p.His140Asn Uncertain significance ★ ⚠ same residue
CSN2 p.His140Tyr Uncertain significance ★ ⚠ same residue
CSN2 p.Ala162Thr Uncertain significance ★ ⚠ same type
CSN2 p.Ala190Gly Uncertain significance ★ ⚠ same type
CSN2 p.Ala85Pro Uncertain significance ★ ⚠ same type
CSN2 p.Arg189Lys Uncertain significance ★ ⚠ same type
CSN2 p.Asp106Asn Uncertain significance ★ ⚠ same type
CSN2 p.Gln194Arg 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/csn2-p-his140arg (accessed [today's date]).

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