Is FLNA p.Leu136= (c.406C>T) pathogenic?

FLNA p.Leu136= (c.406C>T) is classified Likely benign in FLNA (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-25). Very rare (popmax 0.000448%, nfe); Associated with familial thoracic aortic aneurysm and aortic dissection.

What condition is associated with FLNA p.Leu136= (c.406C>T)?

FLNA p.Leu136= (c.406C>T) is associated with familial thoracic aortic aneurysm and aortic dissection, heterotopia, periventricular, X-linked dominant, otopalatodigital syndrome type 2 (ClinVar).

How common is FLNA p.Leu136= (c.406C>T) in the general population?

FLNA p.Leu136= (c.406C>T) is very rare (popmax 0.000448%, nfe) (gnomAD).

FLNA p.Leu136=

Q: How is Familial thoracic aortic aneurysm and aortic dissection inherited?

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

c.406C>T · rs2522765529 · VCV3221697

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000448%, nfe)

Conditions

familial thoracic aortic aneurysm and aortic dissection

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 1.6	GERP 1.8, phastCons 1
Overall
CADD	10.58	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000448% European (non-Finnish) · 4/893,497 alleles

Filtering AF 0.000105% ClinGen BA1/BS1 input FAF95, joint · FAF99 7.1e-05%

Overall 0.000331% 4/1,209,299 alleles · very rare exomes 4/1,095,624 · genomes 0/113,675 · 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: FLNA
Protein: p.Leu136=
Coding: c.406C>T
MANE Select: NM_001110556
dbSNP: rs2522765529
Type: single nucleotide variant
Location: chrX:154368058 (GRCh38)
Structure: AlphaFold pLDDT 77.37 · 26 PDB
Residue 136: an α-helix; the calponin-homology (ch) 1 domain; the 'actin-binding' region

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

Disease context

familial thoracic aortic aneurysm and aortic dissection — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: heterotopia, periventricular, X-linked dominant otopalatodigital syndrome type 2 Melnick-Needles syndrome frontometaphyseal dysplasia

For Familial thoracic aortic aneurysm and aortic dissection (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult, Childhood

Similar variants

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FLNA c.5417-2A>G Likely pathogenic ★★ same condition
FLNA c.868+1G>A Likely pathogenic ★★ same condition
FLNA c.987+1G>A Likely pathogenic ★★ same condition
FLNA p.Ala1188Thr Pathogenic/Likely pathogenic ★★ same condition
FLNA p.Arg1515Ter 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/flna-p-leu136 (accessed [today's date]).

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