Is FLNC p.Pro863Ser (c.2587C>T) pathogenic?

FLNC p.Pro863Ser (c.2587C>T) is classified Uncertain significance in FLNC (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-23). AlphaMissense: ambiguous (0.3652); Ultra-rare (popmax 0.0134%, eas); Associated with myofibrillar myopathy 5.

What condition is associated with FLNC p.Pro863Ser (c.2587C>T)?

FLNC p.Pro863Ser (c.2587C>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.Pro863Ser (c.2587C>T) in the general population?

FLNC p.Pro863Ser (c.2587C>T) is ultra-rare (popmax 0.0134%, eas) (gnomAD).

How is Muscle filaminopathy inherited?

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

What do computational predictors say about FLNC p.Pro863Ser (c.2587C>T)?

AlphaMissense predicts ambiguous (score 0.3652) — an in-silico prediction, not a clinical call.

FLNC p.Pro863Ser

c.2587C>T · rs754750752 · VCV841756

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3652 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0134%, eas)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense indeterminate

Conditions

myofibrillar myopathy 5

Computational evidence

Protein change
AlphaMissense	0.3652	ambiguous
REVEL	0.697	pathogenic-leaning
SaProt	LLR -8.61	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense is indeterminate.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 7.7	phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 11 kb · p 8.4e-13 · regional, not allelic
Overall
CADD	24.8	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0134% East Asian · 6/44,724 alleles

Filtering AF 0.0058% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00395%

Overall 0.000435% 7/1,610,420 alleles · ultra-rare exomes 7/1,458,110 · genomes 0/152,310 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0134%	7,454
Remaining individualsnot grpmax-eligible	0.0016%	62,376

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.Pro863Ser
Coding: c.2587C>T
MANE Select: NM_001458
dbSNP: rs754750752
Type: single nucleotide variant
Location: chr7:128843265 (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

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.Pro863Ala Conflicting classifications of pathogenicity ★ ⚠ same residue
FLNC p.Pro863fs 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-pro863ser (accessed [today's date]).

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