Is LDB3 p.Pro418= (c.1254G>A) pathogenic?

LDB3 p.Pro418= (c.1254G>A) is classified Likely benign in LDB3 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-05-18). Ultra-rare (popmax 0.0282%, afr); Associated with myofibrillar myopathy 4.

What condition is associated with LDB3 p.Pro418= (c.1254G>A)?

LDB3 p.Pro418= (c.1254G>A) is associated with myofibrillar myopathy 4 (ClinVar).

How common is LDB3 p.Pro418= (c.1254G>A) in the general population?

LDB3 p.Pro418= (c.1254G>A) is ultra-rare (popmax 0.0282%, afr) (gnomAD).

LDB3 p.Pro418=

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.1254G>A · rs145942370 · VCV807924

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0282%, afr)

Conditions

myofibrillar myopathy 4

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 -1.5	GERP -3.1
Overall
CADD	6.33	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0282% African / African-American · 21/74,430 alleles

Filtering AF 0.0189% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0158%

Overall 0.00348% 56/1,610,532 alleles · ultra-rare exomes 46/1,459,654 · genomes 10/150,878 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0282%	3,544
East Asian	0.0178%	5,602
Admixed American	0.0167%	5,986
Remaining individualsnot grpmax-eligible	0.00642%	15,572
South Asian	0.0033%	30,299
European (non-Finnish)	0.000848%	117,966

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.Pro418=
Coding: c.1254G>A
MANE Select: NM_007078
dbSNP: rs145942370
Type: single nucleotide variant
Location: chr10:86716349 (GRCh38)
Gene constraint: LOEUF 0.864 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 61.98 · 2 PDB
Residue 418: the 'disordered' region

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.Pro418Leu Uncertain significance ★★ ⚠ same residue
LDB3 p.Pro418Arg Conflicting classifications of pathogenicity ★ ⚠ same residue
LDB3 p.Pro418Ser Uncertain significance ★ ⚠ same residue
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

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-pro418 (accessed [today's date]).

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