Is BBS2 p.Arg374Gln (c.1121G>A) pathogenic?

BBS2 p.Arg374Gln (c.1121G>A) is classified Uncertain significance in BBS2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-08-27). AlphaMissense: likely benign (0.0822); Very rare (popmax 0.00668%, eas); Associated with Inborn genetic diseases.

What condition is associated with BBS2 p.Arg374Gln (c.1121G>A)?

BBS2 p.Arg374Gln (c.1121G>A) is associated with Inborn genetic diseases, Bardet-Biedl syndrome (ClinVar).

How common is BBS2 p.Arg374Gln (c.1121G>A) in the general population?

BBS2 p.Arg374Gln (c.1121G>A) is very rare (popmax 0.00668%, eas) (gnomAD).

What do computational predictors say about BBS2 p.Arg374Gln (c.1121G>A)?

AlphaMissense predicts likely benign (score 0.0822) — an in-silico prediction, not a clinical call.

BBS2 p.Arg374Gln

c.1121G>A · rs371765731 · VCV2416912

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0822 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00668%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0822	likely benign
REVEL	0.181	moderately benign-leaning
SaProt	LLR -6.00	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	Δ0.21	acceptor loss · deltas
Pangolin	Δ0.30	loss · gain 0.00 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 2.7	GERP 1.5, phastCons 0.93
Regional constraint	o/e 0.87	unconstrained · MANE · 35 kb · p 9.6e-05 · regional, not allelic
Overall
CADD	17.74	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 0.00668% East Asian · 3/44,902 alleles

Filtering AF 0.00177% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0013%

Overall 0.00217% 35/1,613,978 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00668%	14,967
Finnishnot grpmax-eligible	0.00469%	21,337
African / African-American	0.00267%	37,443
European (non-Finnish)	0.0022%	45,385
South Asian	0.0011%	91,084

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: BBS2
Protein: p.Arg374Gln
Coding: c.1121G>A
MANE Select: NM_031885
dbSNP: rs371765731
Type: single nucleotide variant
Location: chr16:56501457 (GRCh38)
Gene constraint: LOEUF 0.892 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.49

Full BBS2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Bardet-Biedl syndrome

Similar variants

BBS2 p.Arg374Trp Uncertain significance ★★ ⚠ same residue
BBS2 c.118-1G>T Likely pathogenic ★★ same condition
BBS2 c.118-2A>C Likely pathogenic ★★ same condition
BBS2 c.1225+2T>C Likely pathogenic ★★ same condition
BBS2 c.1397+1G>A Pathogenic/Likely pathogenic ★★ same condition
BBS2 c.1397+2T>C Likely pathogenic ★★ same condition
BBS2 c.1398-2A>G Likely pathogenic ★★ same condition
BBS2 c.1527+1G>A Likely pathogenic ★★ same condition

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/bbs2-p-arg374gln (accessed [today's date]).

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