Is PER2 p.Arg403Gln (c.1208G>A) pathogenic?

PER2 p.Arg403Gln (c.1208G>A) is classified Uncertain significance in PER2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-10-12). AlphaMissense: likely benign (0.0743); Ultra-rare (popmax 0.0387%, afr).

How common is PER2 p.Arg403Gln (c.1208G>A) in the general population?

PER2 p.Arg403Gln (c.1208G>A) is ultra-rare (popmax 0.0387%, afr) (gnomAD).

What do computational predictors say about PER2 p.Arg403Gln (c.1208G>A)?

AlphaMissense predicts likely benign (score 0.0743) — an in-silico prediction, not a clinical call.

PER2 p.Arg403Gln

c.1208G>A · VCV3417023

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0743 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0387%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0743	likely benign
REVEL	0.227	benign-leaning
SaProt	LLR -5.49	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	Δ0.30	acceptor gain · deltas
Pangolin	Δ0.21	gain · loss 0.00 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 0.32	GERP -0.055, phastCons 0.019
Regional constraint	o/e 0.93	unconstrained · MANE · 32 kb · p 0.0048 · regional, not allelic
Overall
CADD	21.1	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

Grpmax group 0.0387% African / African-American · 29/74,958 alleles

Filtering AF 0.0277% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0239%

Overall 0.00279% 45/1,613,906 alleles · ultra-rare exomes 27/1,461,768 · genomes 18/152,138 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0387%	2,585
South Asian	0.00329%	30,359
Admixed American	0.00167%	60,008
Remaining individualsnot grpmax-eligible	0.0016%	62,502
European (non-Finnish)	0.000932%	107,265

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: PER2
Protein: p.Arg403Gln
Coding: c.1208G>A
MANE Select: NM_022817
Type: single nucleotide variant
Location: chr2:238262290 (GRCh38)
Gene constraint: LOEUF 0.67 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 53.96 · 4 PDB
Residue 403: the pac domain

Full PER2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

PER2 p.Arg403Trp Uncertain significance ★ ⚠ same residue
PER2 p.Arg401His Uncertain significance ★★ ⚠ same type
PER2 p.Glu184Ala Uncertain significance ★★ ⚠ same type
PER2 p.Ala655= Benign ★★ same type
PER2 p.Arg401Cys Benign ★★ same type
PER2 p.Arg820= Likely benign ★★ same type
PER2 p.Cys1084Arg Likely benign ★★ same type
PER2 p.His476Asn Likely benign ★★ 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/per2-p-arg403gln (accessed [today's date]).

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