Is TTN p.Phe22803= (c.68409T>C) pathogenic?

TTN p.Phe22803= (c.68409T>C) is classified Likely benign in TTN (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-30). Ultra-rare (popmax 0.0165%, mid); Associated with Cardiovascular phenotype.

What condition is associated with TTN p.Phe22803= (c.68409T>C)?

TTN p.Phe22803= (c.68409T>C) is associated with Cardiovascular phenotype, dilated cardiomyopathy 1G, autosomal recessive limb-girdle muscular dystrophy type 2J (ClinVar).

How common is TTN p.Phe22803= (c.68409T>C) in the general population?

TTN p.Phe22803= (c.68409T>C) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

TTN p.Phe22803=

c.68409T>C · rs1356884915 · VCV2930787

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

Cardiovascular phenotype

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 3.4	GERP -2.4, phastCons 1
Overall
CADD	0.735	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,052 alleles

Overall 0.000124% 2/1,613,270 alleles · ultra-rare exomes 2/1,461,104 · genomes 0/152,166 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,052
South Asian	0.0011%	91,060

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.Phe22803=
Coding: c.68409T>C
MANE Select: NM_001267550
dbSNP: rs1356884915
Type: single nucleotide variant
Location: chr2:178578106 (GRCh38)
Gene constraint: LOEUF 0.479 · pLI <0.01 · ClinGen HI 2/3 (gnomAD)
Residue 22803: the ig-like 117 domain

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

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dilated cardiomyopathy 1G autosomal recessive limb-girdle muscular dystrophy type 2J

Similar variants

TTN c.100171+1G>A Likely pathogenic ★★ same condition
TTN c.100766-1G>T Likely pathogenic ★★ same condition
TTN c.100766-2A>T Likely pathogenic ★★ same condition
TTN c.106375-2A>G Pathogenic/Likely pathogenic ★★ same condition
TTN c.106531+1G>A Pathogenic/Likely pathogenic ★★ same condition
TTN c.107224-1G>C Pathogenic/Likely pathogenic ★★ same condition
TTN c.107377+1G>A Pathogenic/Likely pathogenic ★★ same condition
TTN c.107377+1G>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/ttn-p-phe22803 (accessed [today's date]).

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