Is FLNC p.Cys198= (c.594C>T) pathogenic?

FLNC p.Cys198= (c.594C>T) is classified Likely benign in FLNC (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-01-27). Very rare (popmax 0.00833%, amr); Associated with Cardiovascular phenotype.

What condition is associated with FLNC p.Cys198= (c.594C>T)?

FLNC p.Cys198= (c.594C>T) is associated with Cardiovascular phenotype, myofibrillar myopathy 5, distal myopathy with posterior leg and anterior hand involvement (ClinVar).

How common is FLNC p.Cys198= (c.594C>T) in the general population?

FLNC p.Cys198= (c.594C>T) is very rare (popmax 0.00833%, amr) (gnomAD).

FLNC p.Cys198=

c.594C>T · rs375617228 · VCV810182

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00833%, amr)

Conditions

Cardiovascular phenotype

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -0.043	phastCons 0.91
Overall
CADD	11.07	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00833% Admixed American · 5/60,010 alleles

Filtering AF 0.00323% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00244%

Overall 0.00335% 54/1,613,064 alleles · very rare exomes 50/1,460,856 · genomes 4/152,208 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00833%	12,002
African / African-American	0.00667%	14,987
European (non-Finnish)	0.00364%	27,442
Remaining individualsnot grpmax-eligible	0.0016%	62,476

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.Cys198=
Coding: c.594C>T
MANE Select: NM_001458
dbSNP: rs375617228
Type: single nucleotide variant
Location: chr7:128835567 (GRCh38)
Gene constraint: LOEUF 0.424 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 198: the calponin-homology (ch) 2 domain; the 'actin-binding' region

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

Disease context

Cardiovascular phenotype — 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 hypertrophic cardiomyopathy 26

Similar variants

FLNC p.Cys198Arg Uncertain significance ★ ⚠ same residue
FLNC p.Cys198fs Pathogenic ★ 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-cys198 (accessed [today's date]).

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