Is TTN p.Phe22028= (c.66084C>T) pathogenic?

TTN p.Phe22028= (c.66084C>T) is classified Likely benign in TTN (ClinVar, Single submitter, 1 submitter; last evaluated 2022-04-04). Ultra-rare (popmax 0.0165%, mid); Associated with dilated cardiomyopathy 1G.

What condition is associated with TTN p.Phe22028= (c.66084C>T)?

TTN p.Phe22028= (c.66084C>T) is associated with dilated cardiomyopathy 1G, autosomal recessive limb-girdle muscular dystrophy type 2J (ClinVar).

How common is TTN p.Phe22028= (c.66084C>T) in the general population?

TTN p.Phe22028= (c.66084C>T) is ultra-rare (popmax 0.0165%, mid) (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.Phe22028=

c.66084C>T · rs1448745860 · VCV2104832

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

dilated cardiomyopathy 1G

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 12	GERP 2.9, phastCons 1
Overall
CADD	5.091	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,048 alleles

Overall 0.000124% 2/1,612,572 alleles · ultra-rare exomes 2/1,460,440 · genomes 0/152,132 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,048
Remaining individualsnot grpmax-eligible	0.0016%	62,412

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.Phe22028=
Coding: c.66084C>T
MANE Select: NM_001267550
dbSNP: rs1448745860
Type: single nucleotide variant
Location: chr2:178582372 (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-phe22028 (accessed [today's date]).

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