Is FLNC p.Thr1815= (c.5445C>T) pathogenic?

FLNC p.Thr1815= (c.5445C>T) is classified Likely benign in FLNC (ClinVar, Multiple submitters, 7 submitters; last evaluated 2026-01-18). Ultra-rare (popmax 0.067%, sas); Associated with myofibrillar myopathy 5.

What condition is associated with FLNC p.Thr1815= (c.5445C>T)?

FLNC p.Thr1815= (c.5445C>T) is associated with myofibrillar myopathy 5, cardiomyopathy, distal myopathy with posterior leg and anterior hand involvement (ClinVar).

How common is FLNC p.Thr1815= (c.5445C>T) in the general population?

FLNC p.Thr1815= (c.5445C>T) is ultra-rare (popmax 0.067%, sas) (gnomAD).

How is Muscle filaminopathy inherited?

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

FLNC p.Thr1815=

c.5445C>T · rs758995789 · VCV539477

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 7 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.067%, sas)

Conditions

myofibrillar myopathy 5

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 -9.6
Overall
CADD	3.05	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.067% South Asian · 61/91,054 alleles

Filtering AF 0.0535% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0486%

Overall 0.0132% 213/1,613,496 alleles · ultra-rare exomes 199/1,461,636 · genomes 14/151,860 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.067%	1,493
Remaining individualsnot grpmax-eligible	0.0208%	4,806
European (non-Finnish)	0.011%	9,077
Admixed American	0.00667%	14,982
African / African-American	0.00535%	18,704
East Asian	0.00223%	44,888

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.Thr1815=
Coding: c.5445C>T
MANE Select: NM_001458
dbSNP: rs758995789
Type: single nucleotide variant
Location: chr7:128850849 (GRCh38)
Gene constraint: LOEUF 0.424 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 1815: a β-strand

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: cardiomyopathy 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.Thr1815Ile 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
FLNC c.2550+2T>C 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/flnc-p-thr1815 (accessed [today's date]).

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