3-14125196-G-A

Variant names:

• chr3-14125196-G-A
• NM_024334.3:c.3G>A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PVS1_Supporting PM2

The NM_024334.3(TMEM43):​c.3G>A​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,458,106 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TMEM43 NM_024334.3 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.17

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 105 CDS bases. Genomic position: 14129504. Lost 0.087 part of the original CDS.
• 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.3G>A	p.Met1?	start_lost	Exon 1 of 12	ENST00000306077.5	NP_077310.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM43	ENST00000306077.5	c.3G>A	p.Met1?	start_lost	Exon 1 of 12	1	NM_024334.3	ENSP00000303992.5
TMEM43	ENST00000432444.2	n.3G>A		non_coding_transcript_exon_variant	Exon 1 of 13	3		ENSP00000395617.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1458106 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 725286

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 5 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Dec 13, 2023

This variant alters the translation initiation codon of the TMEM43 mRNA. This variant is expected to disrupt translation initiation and result in an absent or truncated protein product. To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with TMEM43-related disorders in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The role of TMEM43 truncations and other loss-of-function variants in cardiovascular disorders is not yet fully understood. The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0085	T
Eigen	Benign	0.18
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Benign	0.57	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.25	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Benign	-0.99	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.16
Sift	Benign	0.034	D
Sift4G	Benign	0.17	T
Polyphen		0.53	P
Vest4		0.77
MutPred		0.67		Gain of catalytic residue at M1 (P = 0.071);
MVP		0.27
ClinPred		0.99	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.77
gMVP		0.76

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr3-14166696;