Is TTN p.Pro7322Ser (c.21964C>T) pathogenic?

TTN p.Pro7322Ser (c.21964C>T) is classified Uncertain significance in TTN (ClinVar, Single submitter, 1 submitter; last evaluated 2017-10-18). AlphaMissense: ambiguous (0.3766); Very rare (popmax 0.00224%, eas); Associated with autosomal recessive limb-girdle muscular dystrophy type 2J.

How common is TTN p.Pro7322Ser (c.21964C>T) in the general population?

TTN p.Pro7322Ser (c.21964C>T) is very rare (popmax 0.00224%, eas) (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.

What do computational predictors say about TTN p.Pro7322Ser (c.21964C>T)?

AlphaMissense predicts ambiguous (score 0.3766) — an in-silico prediction, not a clinical call.

TTN p.Pro7322Ser

Q: What condition is associated with TTN p.Pro7322Ser (c.21964C>T)?

TTN p.Pro7322Ser (c.21964C>T) is associated with autosomal recessive limb-girdle muscular dystrophy type 2J, dilated cardiomyopathy 1G (ClinVar).

c.21964C>T · rs1553911632 · VCV535737

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3766 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00224%, eas)

Conditions

autosomal recessive limb-girdle muscular dystrophy type 2J

Computational evidence

Protein change
AlphaMissense	0.3766	ambiguous
REVEL	0.341	indeterminate
SaProt	—	not scored · why
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>C here scores Δ0.59 · evaluated, not missing
Constraint at this position
Conservation	phyloP 12	GERP 2.9, phastCons 1
Regional constraint	o/e 0.99	unconstrained · MANE · 141 kb · p 0.23 · regional, not allelic
Overall
CADD	22.5	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL is an independent agreement signal.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM P7005S vs ClinVar P7322S) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00224% East Asian · 1/44,672 alleles

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

Overall 0.000187% 3/1,607,266 alleles · very rare exomes 3/1,455,044 · genomes 0/152,222 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00224%	44,672
European (non-Finnish)	0.00017%	588,401

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.Pro7322Ser
Coding: c.21964C>T
MANE Select: NM_001267550
dbSNP: rs1553911632
Type: single nucleotide variant
Location: chr2:178722935 (GRCh38)
Gene constraint: LOEUF 0.479 · pLI <0.01 · ClinGen HI 2/3 (gnomAD)

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

Similar variants

TTN p.Pro7322= Conflicting classifications of pathogenicity ★ same residue
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

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-pro7322ser (accessed [today's date]).

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