Is ARPC1B p.Ser328= (c.984C>T) pathogenic?

ARPC1B p.Ser328= (c.984C>T) is classified Likely benign in ARPC1B (ClinVar, Single submitter, 1 submitter; last evaluated 2022-10-19). Very rare (popmax 0.00492%, eas).

How common is ARPC1B p.Ser328= (c.984C>T) in the general population?

ARPC1B p.Ser328= (c.984C>T) is very rare (popmax 0.00492%, eas) (gnomAD).

ARPC1B p.Ser328=

c.984C>T · rs1357228506 · VCV1662787

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00492%, eas)

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -6.6	GERP -3
Overall
CADD	0.616	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00492% East Asian · 2/40,680 alleles

Filtering AF 0.000815% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000305%

Overall 0.000195% 3/1,541,018 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00492%	20,340
Finnishnot grpmax-eligible	0.00172%	58,080

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: ARPC1B
Protein: p.Ser328=
Coding: c.984C>T
MANE Select: NM_005720
dbSNP: rs1357228506
Type: single nucleotide variant
Location: chr7:99392871 (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.Ser328Cys Uncertain significance ★ ⚠ 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-ser328 (accessed [today's date]).

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