3-14139262-G-T

Variant names:

• chr3-14139262-G-T
• rs1553603462
• NM_024334.3:c.965G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_024334.3(TMEM43):​c.965G>T​(p.Gly322Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 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. G322S) has been classified as Uncertain significance.

• 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: 9.29
• 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)

ENSG00000268279 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.95

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024334.3. 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
	TMEM43	NM_024334.3	MANE Select	c.965G>T	p.Gly322Val	missense	Exon 11 of 12	NP_077310.1
	TMEM43	NM_001407274.1		c.968G>T	p.Gly323Val	missense	Exon 11 of 12	NP_001394203.1
	TMEM43	NM_001407275.1		c.962G>T	p.Gly321Val	missense	Exon 11 of 12	NP_001394204.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMEM43	ENST00000306077.5	TSL:1 MANE Select	c.965G>T	p.Gly322Val	missense	Exon 11 of 12	ENSP00000303992.5
	ENSG00000268279	ENST00000608606.1	TSL:5	n.200G>T		non_coding_transcript_exon	Exon 3 of 5	ENSP00000476275.1
	TMEM43	ENST00000432444.2	TSL:3	n.*995G>T		non_coding_transcript_exon	Exon 12 of 13	ENSP00000395617.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Emery-Dreifuss muscular dystrophy 7, autosomal dominant Uncertain:1

Sep 24, 2021

HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

ACMG codes: PM2, PP3

Arrhythmogenic right ventricular dysplasia 5 Uncertain:1

Mar 09, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 322 of the TMEM43 protein (p.Gly322Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TMEM43-related conditions. ClinVar contains an entry for this variant (Variation ID: 534758). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.36	T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.88	D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Benign	-0.41	T
MutationAssessor	Pathogenic	3.2	M
PhyloP100		9.3
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-6.5	D
REVEL	Uncertain	0.54
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.010	D
Polyphen		1.0	D
Vest4		0.78
MutPred		0.79		Gain of catalytic residue at G322 (P = 0.0256)
MVP		0.83
MPC		0.45
ClinPred		1.0	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.86
gMVP		0.87
Mutation Taster		=43/57	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: rs1553603462; hg19: chr3-14180762;