NM_024334.3:c.329T>C

Variant names:

• chr3-14131611-T-C
• rs1553602985
• NM_024334.3:c.329T>C

Variant summary

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

The NM_024334.3(TMEM43):​c.329T>C​(p.Leu110Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. L110L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TMEM43 NM_024334.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.46
• Publications: 0 publications found

Genes affected

TMEM43 (HGNC:28472): (transmembrane protein 43) This gene belongs to the TMEM43 family. Defects in this gene are the cause of familial arrhythmogenic right ventricular dysplasia type 5 (ARVD5), also known as arrhythmogenic right ventricular cardiomyopathy type 5 (ARVC5). Arrhythmogenic right ventricular dysplasia is an inherited disorder, often involving both ventricles, and is characterized by ventricular tachycardia, heart failure, sudden cardiac death, and fibrofatty replacement of cardiomyocytes. This gene contains a response element for PPAR gamma (an adipogenic transcription factor), which may explain the fibrofatty replacement of the myocardium, a characteristic pathological finding in ARVC. [provided by RefSeq, Oct 2008]

TMEM43 Gene-Disease associations (from GenCC):

• arrhythmogenic right ventricular dysplasia 5

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, G2P
• autosomal dominant Emery-Dreifuss muscular dystrophy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• auditory neuropathy, autosomal dominant 3

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• Emery-Dreifuss muscular dystrophy 7, autosomal dominant

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

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

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM43	NM_024334.3	c.329T>C	p.Leu110Pro	missense_variant	Exon 4 of 12	ENST00000306077.5	NP_077310.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM43	ENST00000306077.5	c.329T>C	p.Leu110Pro	missense_variant	Exon 4 of 12	1	NM_024334.3	ENSP00000303992.5
TMEM43	ENST00000432444.2	n.*359T>C		non_coding_transcript_exon_variant	Exon 5 of 13	3		ENSP00000395617.1
TMEM43	ENST00000432444.2	n.*359T>C		3_prime_UTR_variant	Exon 5 of 13	3		ENSP00000395617.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 5 Uncertain:1

Aug 25, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TMEM43 protein function. ClinVar contains an entry for this variant (Variation ID: 466416). This variant has not been reported in the literature in individuals affected with TMEM43-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 110 of the TMEM43 protein (p.Leu110Pro). -

Cardiovascular phenotype Uncertain:1

Jun 22, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.L110P variant (also known as c.329T>C), located in coding exon 4 of the TMEM43 gene, results from a T to C substitution at nucleotide position 329. The leucine at codon 110 is replaced by proline, an amino acid with similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Uncertain	0.066	T
BayesDel_noAF	Benign	-0.14
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.10	T
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.85	D
M_CAP	Benign	0.039	D
MetaRNN	Uncertain	0.72	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	2.0	M
PhyloP100		7.5
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.37
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.021	D
Polyphen		0.86	P
Vest4		0.72
MutPred		0.61		Loss of sheet (P = 0.0025);
MVP		0.44
MPC		0.26
ClinPred		0.96	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.1
Varity_R		0.65
gMVP		0.91
Mutation Taster		=23/77	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs1553602985; hg19: chr3-14173111;