Genetic Variant TRPM4:p.Lys914* (chr19-49200394-A-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_017636.4(TRPM4):c.2740A>T(p.Lys914*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00102 in 1,613,920 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.00087 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0010 ( 1 hom. )

Consequence

TRPM4
NM_017636.4 stop_gained

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:6

Conservation

PhyloP100: 8.83

Variant links:

Genes affected

TRPM4 (HGNC:17993): (transient receptor potential cation channel subfamily M member 4) The protein encoded by this gene is a calcium-activated nonselective ion channel that mediates transport of monovalent cations across membranes, thereby depolarizing the membrane. The activity of the encoded protein increases with increasing intracellular calcium concentration, but this channel does not transport calcium. [provided by RefSeq, Mar 2016]

TRPM4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High AC in GnomAd4 at 133 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRPM4	NM_017636.4 link	c.2740A>T	p.Lys914*	stop_gained	Exon 18 of 25	ENST00000252826.10	NP_060106.2	Q8TD43-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRPM4	ENST00000252826.10 link	c.2740A>T	p.Lys914*	stop_gained	Exon 18 of 25	1	NM_017636.4	ENSP00000252826.4		Q8TD43-1

Frequencies

GnomAD3 genomes

AF:

0.000875

AC:

133

AN:

151924

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000854

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00170

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00138

Gnomad OTH

AF:

0.00144

GnomAD3 exomes

AF:

0.00123

AC:

308

AN:

251286

Hom.:

AF XY:

0.00118

AC XY:

160

AN XY:

135856

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000896

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00185

Gnomad NFE exome

AF:

0.00201

Gnomad OTH exome

AF:

0.000978

GnomAD4 exome

AF:

0.00103

AC:

1511

AN:

1461878

Hom.:

Cov.:

AF XY:

0.00103

AC XY:

750

AN XY:

727238

show subpopulations

Gnomad4 AFR exome

AF:

0.000119

Gnomad4 AMR exome

AF:

0.000894

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00169

Gnomad4 NFE exome

AF:

0.00120

Gnomad4 OTH exome

AF:

0.000712

GnomAD4 genome

AF:

0.000875

AC:

133

AN:

152042

Hom.:

Cov.:

AF XY:

0.000619

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.000852

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00170

Gnomad4 NFE

AF:

0.00138

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.00132

Hom.:

Bravo

AF:

0.000967

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00186

AC:

ExAC

AF:

0.00143

AC:

173

EpiCase

AF:

0.00147

EpiControl

AF:

0.000771

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:6

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:2

Dec 07, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported in both patients with Brugada syndrome and control subjects as well as in a cohort of stillbirth cases (PMID: 23382873, 25467552, 27711072, 30847666, 30615648); Published functional studies demonstrated p.(K914*) resulted in decreased expression of the TRPM4 channel, though a dominant effect was not established because the combined expression of wild-type and mutant TRPM4 channels was not studied (PMID: 23382873); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene or region of a gene for which loss of function is not a well-established mechanism of disease; This variant is associated with the following publications: (PMID: 30142439, no PMID, 24721656, 22750058, 27711072, 23382873, 30821013, 31345219, 30847666, 36982932, 37128952, 25467552, 30615648) -

Apr 03, 2020

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jul 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

TRPM4: BS1, BS2 -

Jan 03, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

TRPM4-related disorder

Uncertain:1Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2740A>T (p.Lys914Ter) variant is a stop gained variant that has been reported in at least two studies in which it is found in a heterozygous state in a total of four patients with Brugada syndrome (Liu et al. 2012; Hertz et al. 2015). The p.Lys914Ter variant was reported in two of 1914 controls (Liu et al. 2012) and is reported at a frequency of 0.00221 in the European (Non-Finnish) population of the Exome Aggregation Consortium. There is limited evidence linking the TRPM4 gene to Brugada syndrome. Functional analysis of the p.Lys914Ter variant protein in HEK-293 cells demonstrated the variant resulted in decreased total expression, a truncated protein and a lack of current in a single channel conductance test (Liu et al. 2012). Due to the potential impact of stop-gained variants and the evidence from the literature, the p.Lys914Ter variant is classified as a variant of unknown significance but suspicious for pathogenicity for TRPM4-related disorders. -

Feb 05, 2024

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Progressive familial heart block type IB;C5193144:Erythrokeratodermia variabilis et progressiva 6

Uncertain:1

Jul 30, 2021

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Cardiomyopathy

Benign:1

Jan 10, 2019

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Progressive familial heart block type IB

Benign:1

Jan 31, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

Jan 24, 2019

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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_addAF

Pathogenic

0.21

BayesDel_noAF

Pathogenic

0.53

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Pathogenic

0.82

Eigen_PC

Uncertain

0.66

FATHMM_MKL

Uncertain

0.95

Vest4

0.75

GERP RS

4.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

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

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