Is BAG3 p.Ser264= (c.792C>G) pathogenic?

BAG3 p.Ser264= (c.792C>G) is classified Likely benign in BAG3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-10-22). Very rare (popmax 0.00133%, afr); Associated with myofibrillar myopathy 6.

What condition is associated with BAG3 p.Ser264= (c.792C>G)?

BAG3 p.Ser264= (c.792C>G) is associated with myofibrillar myopathy 6, dilated cardiomyopathy 1HH (ClinVar).

How common is BAG3 p.Ser264= (c.792C>G) in the general population?

BAG3 p.Ser264= (c.792C>G) is very rare (popmax 0.00133%, afr) (gnomAD).

How is BAG3-related myofibrillar myopathy inherited?

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

BAG3 p.Ser264=

c.792C>G · rs1467256368 · VCV1761263

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00133%, afr)

Conditions

myofibrillar myopathy 6

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 -0.56	GERP -2, phastCons 0.012
Overall
CADD	4.205	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00133% African / African-American · 1/74,936 alleles

Overall 0.000124% 2/1,613,778 alleles · very rare exomes 1/1,461,568 · genomes 1/152,210 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00133%	74,936
European (non-Finnish)	8.48e-05%	1,179,928

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: BAG3
Protein: p.Ser264=
Coding: c.792C>G
MANE Select: NM_004281
dbSNP: rs1467256368
Type: single nucleotide variant
Location: chr10:119672539 (GRCh38)
Gene constraint: LOEUF 0.538 · pLI 0.92 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 57.98
Residue 264: the 'disordered' region

Full BAG3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

myofibrillar myopathy 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dilated cardiomyopathy 1HH

For BAG3-related myofibrillar myopathy (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Childhood

Similar variants

BAG3 p.Ser264Phe Uncertain significance ★ ⚠ same residue
BAG3 p.Arg121Ter Pathogenic/Likely pathogenic ★★ same condition
BAG3 p.Arg123Ter Pathogenic/Likely pathogenic ★★ same condition
BAG3 p.Arg309Ter Pathogenic ★★ same condition
BAG3 p.Arg473Ter Pathogenic/Likely pathogenic ★★ same condition
BAG3 p.Arg90Ter Pathogenic ★★ same condition
BAG3 p.Gln132Ter Pathogenic ★★ same condition
BAG3 p.Gln135Ter 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/bag3-p-ser264 (accessed [today's date]).

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