Is TTN p.Pro28059= (c.84177A>G) pathogenic?

TTN p.Pro28059= (c.84177A>G) is classified Likely benign in TTN (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-15). Ultra-rare (popmax 0.0165%, mid); Associated with autosomal recessive limb-girdle muscular dystrophy type 2J.

How common is TTN p.Pro28059= (c.84177A>G) in the general population?

TTN p.Pro28059= (c.84177A>G) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

How is Titin-related limb-girdle muscular dystrophy R10 inherited?

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

TTN p.Pro28059=

Q: What condition is associated with TTN p.Pro28059= (c.84177A>G)?

TTN p.Pro28059= (c.84177A>G) is associated with autosomal recessive limb-girdle muscular dystrophy type 2J, dilated cardiomyopathy 1G (ClinVar).

c.84177A>G · rs141559873 · VCV2931356

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

autosomal recessive limb-girdle muscular dystrophy type 2J

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 -2.6	GERP -5.9
Overall
CADD	0.112	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,056 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000186% 3/1,613,184 alleles · ultra-rare exomes 2/1,460,882 · genomes 1/152,302 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,056
European (non-Finnish)	0.00017%	589,689

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.Pro28059=
Coding: c.84177A>G
MANE Select: NM_001267550
dbSNP: rs141559873
Type: single nucleotide variant
Location: chr2:178561955 (GRCh38)

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

Disease context

autosomal recessive limb-girdle muscular dystrophy type 2J — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: dilated cardiomyopathy 1G

For Titin-related limb-girdle muscular dystrophy R10 (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood

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-pro28059 (accessed [today's date]).

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