Is LDB3 p.Ile103= (c.309C>A) pathogenic?

LDB3 p.Ile103= (c.309C>A) is classified Likely benign in LDB3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-02-22). Very rare (popmax 0.004%, afr); Associated with Cardiovascular phenotype.

What condition is associated with LDB3 p.Ile103= (c.309C>A)?

LDB3 p.Ile103= (c.309C>A) is associated with Cardiovascular phenotype, myofibrillar myopathy 4 (ClinVar).

How common is LDB3 p.Ile103= (c.309C>A) in the general population?

LDB3 p.Ile103= (c.309C>A) is very rare (popmax 0.004%, afr) (gnomAD).

LDB3 p.Ile103=

c.309C>A · rs1060504198 · VCV414132

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Conditions

Cardiovascular phenotype

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 -0.094	GERP -4.1, phastCons 0.61
Overall
CADD	2.085	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.004% African / African-American · 3/75,068 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000494%

Overall 0.000434% 7/1,614,076 alleles · very rare exomes 7/1,461,712 · genomes 0/152,364 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.004%	25,023
South Asian	0.0011%	91,086
European (non-Finnish)	0.000254%	393,300

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.Ile103=
Coding: c.309C>A
MANE Select: NM_007078
dbSNP: rs1060504198
Type: single nucleotide variant
Location: chr10:86680145 (GRCh38)
Gene constraint: LOEUF 0.864 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 61.98 · 2 PDB
Residue 103: the 'disordered' region

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

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: myofibrillar myopathy 4

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-ile103 (accessed [today's date]).

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