Is ARPC1B p.Ser143Pro (c.427T>C) pathogenic?

ARPC1B p.Ser143Pro (c.427T>C) is classified Uncertain significance in ARPC1B (ClinVar, Single submitter, 1 submitter; last evaluated 2022-05-04). AlphaMissense: likely pathogenic (0.9987); Absent from gnomAD v4.1.

How common is ARPC1B p.Ser143Pro (c.427T>C) in the general population?

ARPC1B p.Ser143Pro (c.427T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ARPC1B p.Ser143Pro (c.427T>C)?

AlphaMissense predicts likely pathogenic (score 0.9987) — an in-silico prediction, not a clinical call.

ARPC1B p.Ser143Pro

c.427T>C · rs2484639363 · VCV2117348

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9987 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.9987	likely pathogenic · top 5% in ARPC1B
REVEL	0.834	moderately pathogenic-leaning
SaProt	LLR -16.86	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 1.9, phastCons 1
Regional constraint	o/e 0.89	unconstrained · MANE · 8,771 bp · p 0.0087 · regional, not allelic
Overall
CADD	32.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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: ARPC1B
Protein: p.Ser143Pro
Coding: c.427T>C
MANE Select: NM_005720
dbSNP: rs2484639363
Type: single nucleotide variant
Location: chr7:99389939 (GRCh38)
Gene constraint: LOEUF 0.876 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.81 · 4 PDB

Full ARPC1B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ARPC1B p.Ser143= Likely benign ★ same residue
ARPC1B c.392+2T>C Pathogenic ★★ same type
ARPC1B c.64+2T>A Pathogenic ★★ same type
ARPC1B p.Ala261= Pathogenic ★★ same type
ARPC1B c.1080+4A>C Uncertain significance ★★ same type
ARPC1B c.170-3C>T Uncertain significance ★★ same type
ARPC1B c.501-5G>A Uncertain significance ★★ same type
ARPC1B p.Ala238Val 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/arpc1b-p-ser143pro (accessed [today's date]).

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