rs121908339

Variant names:

• chr10-86687107-A-T
• rs121908339
• NM_001368067.1:c.383A>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001368067.1(LDB3):​c.383A>T​(p.Lys128Met) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K128Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: LDB3 NM_001368067.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 7.19
• Publications: 3 publications found

Genes affected

LDB3 (HGNC:15710): (LIM domain binding 3) This gene encodes a PDZ domain-containing protein. PDZ motifs are modular protein-protein interaction domains consisting of 80-120 amino acid residues. PDZ domain-containing proteins interact with each other in cytoskeletal assembly or with other proteins involved in targeting and clustering of membrane proteins. The protein encoded by this gene interacts with alpha-actinin-2 through its N-terminal PDZ domain and with protein kinase C via its C-terminal LIM domains. The LIM domain is a cysteine-rich motif defined by 50-60 amino acids containing two zinc-binding modules. This protein also interacts with all three members of the myozenin family. Mutations in this gene have been associated with myofibrillar myopathy and dilated cardiomyopathy. Alternatively spliced transcript variants encoding different isoforms have been identified; all isoforms have N-terminal PDZ domains while only longer isoforms (1, 2 and 5) have C-terminal LIM domains. [provided by RefSeq, Jan 2010]

LDB3 Gene-Disease associations (from GenCC):

• myofibrillar myopathy 4

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• familial dilated cardiomyopathy

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ENSG00000289258 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001368067.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LDB3	NM_001368067.1	MANE Plus Clinical	c.383A>T	p.Lys128Met	missense	Exon 6 of 9	NP_001354996.1
	LDB3	NM_007078.3	MANE Select	c.690-4789A>T		intron	N/A	NP_009009.1
	LDB3	NM_001171610.2		c.728A>T	p.Lys243Met	missense	Exon 6 of 14	NP_001165081.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LDB3	ENST00000263066.11	TSL:1 MANE Plus Clinical	c.383A>T	p.Lys128Met	missense	Exon 6 of 9	ENSP00000263066.7
	LDB3	ENST00000372056.8	TSL:1	c.728A>T	p.Lys243Met	missense	Exon 5 of 8	ENSP00000361126.4
	LDB3	ENST00000372066.8	TSL:1	c.383A>T	p.Lys128Met	missense	Exon 5 of 8	ENSP00000361136.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dilated cardiomyopathy 1C Pathogenic:1

Dec 03, 2003

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Cardiomyopathy Uncertain:1

Jun 06, 2017

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Pathogenic	0.16	D
BayesDel_noAF	Uncertain	0.0
CADD	Benign	21
DANN	Uncertain	1.0
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.93	D
M_CAP	Uncertain	0.26	D
MetaRNN	Uncertain	0.48	T
MetaSVM	Uncertain	0.57	D
PhyloP100		7.2
PROVEAN	Uncertain	-2.5	D
REVEL	Uncertain	0.60
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.018	D
Polyphen		0.94	P
Vest4		0.80
MutPred		0.37		Loss of ubiquitination at K128 (P = 0.0092)
MVP		0.81
MPC		0.89
ClinPred		0.98	D
GERP RS		5.0
gMVP		0.84
Mutation Taster		=31/69	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs121908339; hg19: chr10-88446864;