Is FLNC p.Asp66= (c.198C>T) pathogenic?

FLNC p.Asp66= (c.198C>T) is classified Likely benign in FLNC (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-05-24). Very rare (popmax 0.00178%, nfe); Associated with myofibrillar myopathy 5.

What condition is associated with FLNC p.Asp66= (c.198C>T)?

FLNC p.Asp66= (c.198C>T) is associated with myofibrillar myopathy 5, distal myopathy with posterior leg and anterior hand involvement, hypertrophic cardiomyopathy 26 (ClinVar).

How common is FLNC p.Asp66= (c.198C>T) in the general population?

FLNC p.Asp66= (c.198C>T) is very rare (popmax 0.00178%, nfe) (gnomAD).

How is Muscle filaminopathy inherited?

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

FLNC p.Asp66=

c.198C>T · rs764772679 · VCV1082171

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00178%, nfe)

Conditions

myofibrillar myopathy 5

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 0.81	phastCons 1
Overall
CADD	13.58	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00178% European (non-Finnish) · 21/1,179,960 alleles

Filtering AF 0.00114% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000971%

Overall 0.0013% 21/1,612,984 alleles · very rare exomes 20/1,460,734 · genomes 1/152,250 · joint denominator

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.Asp66=
Coding: c.198C>T
MANE Select: NM_001458
dbSNP: rs764772679
Type: single nucleotide variant
Location: chr7:128830835 (GRCh38)
Gene constraint: LOEUF 0.424 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 66: the calponin-homology (ch) 1 domain; the 'actin-binding' region

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

Disease context

myofibrillar myopathy 5 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: distal myopathy with posterior leg and anterior hand involvement hypertrophic cardiomyopathy 26

For Muscle filaminopathy (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult

Similar variants

FLNC p.Asp66Tyr Uncertain significance ★★ ⚠ same residue
FLNC p.Asp66Ala Uncertain significance ★ ⚠ same residue
FLNC p.Asp66Glu Uncertain significance ★ ⚠ same residue
FLNC p.Asp66Gly Uncertain significance ★ ⚠ same residue
FLNC p.Asp66His 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

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-asp66 (accessed [today's date]).

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