Is LDB3 p.Cys657= (c.1971C>T) pathogenic?

LDB3 p.Cys657= (c.1971C>T) is classified Benign/Likely benign in LDB3 (ClinVar, Multiple submitters, 8 submitters; last evaluated 2026-01-27). Ultra-rare (popmax 0.0502%, nfe); Associated with Cardiovascular phenotype.

What condition is associated with LDB3 p.Cys657= (c.1971C>T)?

LDB3 p.Cys657= (c.1971C>T) is associated with Cardiovascular phenotype, myofibrillar myopathy 4 (ClinVar).

How common is LDB3 p.Cys657= (c.1971C>T) in the general population?

LDB3 p.Cys657= (c.1971C>T) is ultra-rare (popmax 0.0502%, nfe) (gnomAD).

LDB3 p.Cys657=

c.1971C>T · rs140552419 · VCV45537

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 8 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0502%, nfe)

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 -3.1	GERP -4.6
Overall
CADD	6.964	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0502% European (non-Finnish) · 592/1,180,008 alleles

Filtering AF 0.0468% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0454%

Overall 0.0392% 632/1,614,044 alleles · ultra-rare exomes 597/1,461,782 · genomes 35/152,262 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0502%	1,993
Remaining individualsnot grpmax-eligible	0.0368%	2,718
Middle Eastern	0.033%	3,031
Admixed American	0.015%	6,669
African / African-American	0.00533%	18,755
Finnishnot grpmax-eligible	0.00156%	63,948
South Asian	0.0011%	91,082

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.Cys657=
Coding: c.1971C>T
MANE Select: NM_007078
dbSNP: rs140552419
Type: single nucleotide variant
Location: chr10:86718840 (GRCh38)
Gene constraint: LOEUF 0.864 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 61.98 · 2 PDB
Residue 657: the lim zinc-binding 2 domain; a UniProt-annotated variant site (in cmd2l; likely pathogenic)

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-cys657 (accessed [today's date]).

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