Is FLNC p.Lys377= (c.1131G>A) pathogenic?

FLNC p.Lys377= (c.1131G>A) is classified Likely benign in FLNC (ClinVar, Single submitter, 1 submitter; last evaluated 2025-05-29). Very rare (popmax 0.00267%, afr); Associated with hypertrophic cardiomyopathy 26.

What condition is associated with FLNC p.Lys377= (c.1131G>A)?

FLNC p.Lys377= (c.1131G>A) is associated with hypertrophic cardiomyopathy 26, myofibrillar myopathy 5, distal myopathy with posterior leg and anterior hand involvement (ClinVar).

How common is FLNC p.Lys377= (c.1131G>A) in the general population?

FLNC p.Lys377= (c.1131G>A) is very rare (popmax 0.00267%, afr) (gnomAD).

FLNC p.Lys377=

c.1131G>A · VCV4812596

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00267%, afr)

Conditions

hypertrophic cardiomyopathy 26

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 0.49	phastCons 0.99
Overall
CADD	7.867	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00267% African / African-American · 2/74,940 alleles

Filtering AF 0.000443% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000166%

Overall 0.000372% 6/1,613,978 alleles · very rare exomes 5/1,461,766 · genomes 1/152,212 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00267%	37,470
European (non-Finnish)	0.000339%	295,001

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: FLNC
Protein: p.Lys377=
Coding: c.1131G>A
MANE Select: NM_001458
Type: single nucleotide variant
Location: chr7:128838350 (GRCh38)
Gene constraint: LOEUF 0.424 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)

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

Disease context

hypertrophic cardiomyopathy 26 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: myofibrillar myopathy 5 distal myopathy with posterior leg and anterior hand involvement

Similar variants

FLNC p.Lys377Asn Uncertain significance ★★ same residue
FLNC p.Lys377Glu Uncertain significance ★★ ⚠ same residue
FLNC c.1047+1G>T Likely pathogenic ★★ same condition
FLNC c.1048-1G>A Likely pathogenic ★★ same condition
FLNC c.1210+1G>A Likely pathogenic ★★ same condition
FLNC c.1549+2T>G Likely pathogenic ★★ same condition
FLNC c.2007+1G>A Likely pathogenic ★★ same condition
FLNC c.2550+1G>C 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/flnc-p-lys377 (accessed [today's date]).

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