rs143124744

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_ModerateBP6BP7BS1BS2

The NM_024334.3(TMEM43):c.564C>T(p.Gly188=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000452 in 1,614,184 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000027 ( 1 hom. )

Consequence

TMEM43
NM_024334.3 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: 1.12

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.41).

BP6

Variant 3-14133790-C-T is Benign according to our data. Variant chr3-14133790-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 264054.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=1}. Variant chr3-14133790-C-T is described in Lovd as [Likely_benign].

BP7

Synonymous conserved (PhyloP=1.12 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000217 (33/152322) while in subpopulation AFR AF= 0.00077 (32/41568). AF 95% confidence interval is 0.000559. There are 0 homozygotes in gnomad4. There are 15 alleles in male gnomad4 subpopulation. This position pass quality control queck.

BS2

High AC in GnomAd at 33 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TMEM43	NM_024334.3 linkuse as main transcript	c.564C>T	p.Gly188=	synonymous_variant	7/12	ENST00000306077.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TMEM43	ENST00000306077.5 linkuse as main transcript	c.564C>T	p.Gly188=	synonymous_variant	7/12	1	NM_024334.3	P1
TMEM43	ENST00000432444.2 linkuse as main transcript	c.*594C>T		3_prime_UTR_variant, NMD_transcript_variant	8/13	3

Frequencies

GnomAD3 genomes

AF:

0.000217

AC:

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000772

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000517

AC:

AN:

251472

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135906

show subpopulations

Gnomad AFR exome

AF:

0.000800

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000274

AC:

AN:

1461862

Hom.:

Cov.:

AF XY:

0.0000261

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.00114

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:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.000217

AC:

AN:

152322

Hom.:

Cov.:

AF XY:

0.000201

AC XY:

AN XY:

74498

show subpopulations

Gnomad4 AFR

AF:

0.000770

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000986

Hom.:

Bravo

AF:

0.000249

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 16, 2023	Variant summary: TMEM43 c.564C>T alters a conserved nucleotide resulting in a synonymous change. Several computational tools predict a significant impact on normal splicing: Four predict the variant creates/strengthens a cryptic 5' donor site and also predict the variant weakens/abolishes a cryptic 3' acceptor site. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 5.2e-05 in 251472 control chromosomes, found exclusively within the African or African-American subpopulation at a frequency of 0.0008 in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 96 fold of the estimated maximal expected allele frequency for a pathogenic variant in TMEM43 causing Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy phenotype (8.3e-06), suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. To our knowledge, no occurrence of c.564C>T in individuals affected with Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy and no experimental evidence demonstrating its impact on protein function have been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 and classified the variant as either likely benign (n=3) or VUS (n=3). Based on the evidence outlined above, the variant was classified as likely benign until further evidence is available to determine the variant effect on normal splicing and function. -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 19, 2012	p.Gly188Gly in Exon 07 of TMEM43: This variant is not expected to have clinical significance because it does not alter an amino acid residue, is not located wit hin the splice consensus sequence. It has been identified in 0.1% (3/3738) of Af rican American chromosomes from a broad population by the NHLBI Exome Sequencing Project (http://evs.gs.washington.edu/EVS; dbSNP rs143124744). -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Sep 10, 2021

Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports a deleterious effect on splicing; Reported in ClinVar (ClinVar Variant ID# 264054; Landrum et al., 2016); This variant is associated with the following publications: (PMID: 26582918) -

Cardiomyopathy

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Dec 01, 2018

- -

Arrhythmogenic right ventricular dysplasia 5

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 24, 2024

- -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 27, 2015

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.41

Cadd

Benign

Dann

Benign

0.61

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.83

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.83

Position offset: -2

DS_DL_spliceai

0.29

Position offset: 19

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over