Is LDB3 p.Pro449Ser (c.1345C>T) pathogenic?

LDB3 p.Pro449Ser (c.1345C>T) is classified Uncertain significance in LDB3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-04-26). AlphaMissense: likely benign (0.0859); Very rare (popmax 8.56e-05%, nfe); Associated with myofibrillar myopathy 4.

What condition is associated with LDB3 p.Pro449Ser (c.1345C>T)?

LDB3 p.Pro449Ser (c.1345C>T) is associated with myofibrillar myopathy 4 (ClinVar).

How common is LDB3 p.Pro449Ser (c.1345C>T) in the general population?

LDB3 p.Pro449Ser (c.1345C>T) is very rare (popmax 8.56e-05%, nfe) (gnomAD).

What do computational predictors say about LDB3 p.Pro449Ser (c.1345C>T)?

AlphaMissense predicts likely benign (score 0.0859) — an in-silico prediction, not a clinical call.

LDB3 p.Pro449Ser

Q: How is Late-onset distal myopathy, Markesbery-Griggs type inherited?

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

c.1345C>T · rs1846876181 · VCV3225978

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0859 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.56e-05%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

myofibrillar myopathy 4

Computational evidence

Protein change
AlphaMissense	0.0859	likely benign
REVEL	0.025	moderately benign-leaning
SaProt	LLR -9.65	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.4	GERP 1.5, phastCons 0.96
Regional constraint	o/e 0.95	unconstrained · MANE · 64 kb · p 0.14 · regional, not allelic
Overall
CADD	12.83	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.56e-05% European (non-Finnish) · 1/1,168,882 alleles

Overall 6.29e-05% 1/1,590,616 alleles · very rare exomes 1/1,446,676 · genomes 0/143,940 · 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: LDB3
Protein: p.Pro449Ser
Coding: c.1345C>T
MANE Select: NM_007078
dbSNP: rs1846876181
Type: single nucleotide variant
Location: chr10:86716440 (GRCh38)
Gene constraint: LOEUF 0.864 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 61.98 · 2 PDB

Full LDB3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

myofibrillar myopathy 4 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Late-onset distal myopathy, Markesbery-Griggs type (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult
Prevalence: <1 / 1 000 000 (Worldwide)

Similar variants

LDB3 p.Ala147Thr Pathogenic/Likely pathogenic ★★ same condition
LDB3 p.Ala165Val Pathogenic/Likely pathogenic ★★ same condition
LDB3 c.1231+4A>C Uncertain significance ★★ same condition
LDB3 c.1858-11C>A Uncertain significance ★★ same condition
LDB3 c.246-3C>T Uncertain significance ★★ same condition
LDB3 c.322-1G>A Uncertain significance ★★ same condition
LDB3 c.859+3G>A Uncertain significance ★★ same condition
LDB3 c.859+5G>C Uncertain significance ★★ 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/ldb3-p-pro449ser (accessed [today's date]).

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