Is LDB3 p.Ile138= (c.414C>A) pathogenic?

LDB3 p.Ile138= (c.414C>A) is classified Likely benign in LDB3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-07-13). Ultra-rare (popmax 0.0296%, sas); Associated with myofibrillar myopathy 4.

What condition is associated with LDB3 p.Ile138= (c.414C>A)?

LDB3 p.Ile138= (c.414C>A) is associated with myofibrillar myopathy 4 (ClinVar).

How common is LDB3 p.Ile138= (c.414C>A) in the general population?

LDB3 p.Ile138= (c.414C>A) is ultra-rare (popmax 0.0296%, sas) (gnomAD).

LDB3 p.Ile138=

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.414C>A · VCV4702319

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0296%, sas)

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 -2.7	GERP -4.2
Overall
CADD	6.021	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0296% South Asian · 27/91,086 alleles

Filtering AF 0.0208% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.018%

Overall 0.00173% 28/1,614,092 alleles · ultra-rare exomes 27/1,461,876 · genomes 1/152,216 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0296%	3,374
Admixed American	0.00167%	59,996

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.Ile138=
Coding: c.414C>A
MANE Select: NM_007078 · reported on NM_001368067
Type: single nucleotide variant
Location: chr10:86687138 (GRCh38)
Gene constraint: LOEUF 0.864 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 61.98 · 2 PDB
Residue 138: 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.Leu138Val 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
LDB3 c.322-1G>A Uncertain significance ★★ same condition
LDB3 c.859+3G>A 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-ile138 (accessed [today's date]).

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