Is BAG3 p.Ser377fs (c.1131_1134del) pathogenic?

BAG3 p.Ser377fs (c.11311134del) is classified Pathogenic/Likely pathogenic in BAG3 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-05-29). Absent from gnomAD; Associated with dilated cardiomyopathy 1HH.

What condition is associated with BAG3 p.Ser377fs (c.1131_1134del)?

BAG3 p.Ser377fs (c.1131_1134del) is associated with dilated cardiomyopathy 1HH, myofibrillar myopathy 6 (ClinVar).

How common is BAG3 p.Ser377fs (c.1131_1134del) in the general population?

BAG3 p.Ser377fs (c.1131_1134del) is absent from gnomAD (gnomAD).

How is Familial isolated dilated cardiomyopathy inherited?

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

BAG3 p.Ser377fs

c.1131_1134del · rs2494023044 · VCV2501612

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

dilated cardiomyopathy 1HH

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	escapes	premature termination codon in the last exon (4 of 4) — the truncated protein is likely expressed. PVS1 input, not an applied code
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 2.3	GERP 0.38, phastCons 0.98

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: BAG3
Protein: p.Ser377fs
Coding: c.1131_1134del
MANE Select: NM_004281
dbSNP: rs2494023044
Type: Deletion
Location: chr10:119676685 (GRCh38)
Gene constraint: LOEUF 0.538 · pLI 0.92 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 57.98
Residue 377: a modified residue (phosphoserine); the 'disordered' region

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

Disease context

dilated cardiomyopathy 1HH — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: myofibrillar myopathy 6

For Familial isolated dilated cardiomyopathy (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Mitochondrial inheritance
Onset: All ages
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

BAG3 p.Ser377Ile Uncertain significance ★ ⚠ same residue
BAG3 p.Glu360fs Likely pathogenic ★★ same condition
BAG3 p.Glu471fs Likely pathogenic ★★ same condition
BAG3 p.Gly25fs Pathogenic/Likely pathogenic ★★ same condition
BAG3 p.Leu423fs Pathogenic ★★ same condition
BAG3 p.Lys324fs Pathogenic/Likely pathogenic ★★ same condition
BAG3 p.Met10fs Pathogenic ★★ same condition
BAG3 p.Pro356fs 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/bag3-p-ser377fs (accessed [today's date]).

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