Is BBS7 p.His647Arg (c.1940A>G) pathogenic?

BBS7 p.His647Arg (c.1940A>G) is classified Uncertain significance in BBS7 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-02-18). AlphaMissense: likely benign (0.0476); Very rare (popmax 0.00167%, amr); Associated with Bardet-Biedl syndrome 7.

What condition is associated with BBS7 p.His647Arg (c.1940A>G)?

BBS7 p.His647Arg (c.1940A>G) is associated with Bardet-Biedl syndrome 7 (ClinVar).

How common is BBS7 p.His647Arg (c.1940A>G) in the general population?

BBS7 p.His647Arg (c.1940A>G) is very rare (popmax 0.00167%, amr) (gnomAD).

How is Bardet-Biedl syndrome inherited?

Typically Autosomal recessive, Oligogenic (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about BBS7 p.His647Arg (c.1940A>G)?

AlphaMissense predicts likely benign (score 0.0476) — an in-silico prediction, not a clinical call.

BBS7 p.His647Arg

c.1940A>G · rs1725000311 · VCV2502261

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0476 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Bardet-Biedl syndrome 7

Computational evidence

Protein change
AlphaMissense	0.0476	likely benign
REVEL	0.252	benign-leaning
SaProt	LLR -3.07	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · T>A here scores Δ0.49 · evaluated, not missing
Constraint at this position
Conservation	phyloP 4.9	GERP 1, phastCons 1
Regional constraint	o/e 0.87	unconstrained · MANE · 44 kb · p 0.00015 · regional, not allelic
Overall
CADD	16.18	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 0.00167% Admixed American · 1/59,994 alleles

Overall 0.000657% 1/152,206 alleles · very rare

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: BBS7
Protein: p.His647Arg
Coding: c.1940A>G
MANE Select: NM_176824
dbSNP: rs1725000311
Type: single nucleotide variant
Location: chr4:121828220 (GRCh38)
Gene constraint: LOEUF 0.701 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 92.99

Full BBS7 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Bardet-Biedl syndrome 7 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Bardet-Biedl syndrome (Orphanet):

Inheritance: Autosomal recessive, Oligogenic
Onset: Antenatal, Childhood, Infancy, Neonatal
Prevalence: 1-9 / 100 000 (Specific population)

Similar variants

BBS7 c.1371+1G>A Likely pathogenic ★★ same condition
BBS7 c.1512-1G>A Likely pathogenic ★★ same condition
BBS7 c.1677-2A>G Pathogenic/Likely pathogenic ★★ same condition
BBS7 c.1891-2A>C Pathogenic/Likely pathogenic ★★ same condition
BBS7 c.529-2A>G Pathogenic/Likely pathogenic ★★ same condition
BBS7 c.849+1G>C Pathogenic/Likely pathogenic ★★ same condition
BBS7 p.Arg280Ter Pathogenic/Likely pathogenic ★★ same condition
BBS7 p.Gln176Ter Pathogenic/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/bbs7-p-his647arg (accessed [today's date]).

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