Is TTN p.Pro25802= (c.77406T>A) pathogenic?

TTN p.Pro25802= (c.77406T>A) is classified Likely benign in TTN (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-08-29). Very rare (popmax 0.00136%, nfe); Associated with dilated cardiomyopathy 1G.

What condition is associated with TTN p.Pro25802= (c.77406T>A)?

TTN p.Pro25802= (c.77406T>A) is associated with dilated cardiomyopathy 1G, autosomal recessive limb-girdle muscular dystrophy type 2J (ClinVar).

How common is TTN p.Pro25802= (c.77406T>A) in the general population?

TTN p.Pro25802= (c.77406T>A) is very rare (popmax 0.00136%, nfe) (gnomAD).

How is Familial isolated dilated cardiomyopathy inherited?

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

TTN p.Pro25802=

c.77406T>A · rs760571970 · VCV1088072

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00136%, nfe)

Conditions

dilated cardiomyopathy 1G

⚠ Built without this gene's context — gene constraint and dosage, protein structure, pathways, panels and related-variant links were not looked up for this page. why

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 0.91	GERP -1.9, phastCons 0.7
Overall
CADD	0.215	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00136% European (non-Finnish) · 16/1,179,518 alleles

Filtering AF 0.000803% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00065%

Overall 0.000992% 16/1,613,230 alleles · very rare exomes 16/1,461,028 · genomes 0/152,202 · 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: TTN
Protein: p.Pro25802=
Coding: c.77406T>A
MANE Select: NM_001267550
dbSNP: rs760571970
Type: single nucleotide variant
Location: chr2:178568726 (GRCh38)

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

Disease context

dilated cardiomyopathy 1G — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal recessive limb-girdle muscular dystrophy type 2J

For Familial isolated dilated cardiomyopathy (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Mitochondrial inheritance
Onset: All ages
Prevalence: 1-9 / 100 000 (Europe)

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/ttn-p-pro25802 (accessed [today's date]).

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