Is BBS4 p.Thr452= (c.1356C>T) pathogenic?

BBS4 p.Thr452= (c.1356C>T) is classified Likely benign in BBS4 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-08-10). Very rare (popmax 0.00333%, amr); Associated with Bardet-Biedl syndrome.

What condition is associated with BBS4 p.Thr452= (c.1356C>T)?

BBS4 p.Thr452= (c.1356C>T) is associated with Bardet-Biedl syndrome (ClinVar).

How common is BBS4 p.Thr452= (c.1356C>T) in the general population?

BBS4 p.Thr452= (c.1356C>T) is very rare (popmax 0.00333%, amr) (gnomAD).

How is Bardet-Biedl syndrome inherited?

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

BBS4 p.Thr452=

c.1356C>T · rs748096273 · VCV2141708

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00333%, amr)

Conditions

Bardet-Biedl syndrome

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 0.25	GERP -1.4, phastCons 0.013
Overall
CADD	5.597	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00333% Admixed American · 2/59,996 alleles

Filtering AF 0.000553% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000207%

Overall 0.000558% 9/1,614,070 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0064%	15,622
Admixed Americangrpmax	0.00333%	29,998
African / African-American	0.00267%	37,462
European (non-Finnish)	8.47e-05%	1,180,044

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: BBS4
Protein: p.Thr452=
Coding: c.1356C>T
MANE Select: NM_033028
dbSNP: rs748096273
Type: single nucleotide variant
Location: chr15:72736869 (GRCh38)
Gene constraint: LOEUF 0.953 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 78.36 · 1 PDB
Residue 452: the 'required for localization to centrosomes' region; the 'disordered' region

Full BBS4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Bardet-Biedl syndrome — 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

BBS4 c.1106+2T>A Pathogenic/Likely pathogenic ★★ same condition
BBS4 c.1248+1G>A Pathogenic/Likely pathogenic ★★ same condition
BBS4 c.1248+1G>T Pathogenic ★★ same condition
BBS4 c.1248+2T>C Pathogenic/Likely pathogenic ★★ same condition
BBS4 c.1249-2A>C Likely pathogenic ★★ same condition
BBS4 c.157-2A>G Pathogenic ★★ same condition
BBS4 c.157-3C>G Pathogenic ★★ same condition
BBS4 c.220+1G>C 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/bbs4-p-thr452 (accessed [today's date]).

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