rs1555751873

Variant names:

• chr19-49168367-A-G
• rs1555751873
• NM_017636.4:c.556A>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017636.4(TRPM4):​c.556A>G​(p.Met186Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,808 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TRPM4 NM_017636.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.612
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• erythrokeratodermia variabilis et progressiva 6

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• progressive familial heart block type IB

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
• erythrokeratodermia variabilis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• progressive familial heart block

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Brugada syndrome

  Inheritance: AD Classification: LIMITED, NO_KNOWN Submitted by: Genomics England PanelApp, ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20417413).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRPM4	NM_017636.4	c.556A>G	p.Met186Val	missense_variant	Exon 5 of 25	ENST00000252826.10	NP_060106.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRPM4	ENST00000252826.10	c.556A>G	p.Met186Val	missense_variant	Exon 5 of 25	1	NM_017636.4	ENSP00000252826.4

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461808 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727198

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53342

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Progressive familial heart block type IB Uncertain:1

Sep 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces methionine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 186 of the TRPM4 protein (p.Met186Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TRPM4-related conditions. ClinVar contains an entry for this variant (Variation ID: 468941). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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 v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T;.
Eigen	Benign	-0.25
Eigen_PC	Benign	-0.043
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.82	T;T
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.20	T;T
MetaSVM	Benign	-0.68	T
MutationAssessor	Benign	0.40	N;N
PhyloP100		0.61
PrimateAI	Benign	0.47	T
PROVEAN	Benign	0.23	N;N
REVEL	Benign	0.12
Sift	Benign	0.27	T;T
Sift4G	Benign	0.28	T;T
Polyphen		0.032	B;B
Vest4		0.41
MutPred		0.66		Gain of loop (P = 0.069);Gain of loop (P = 0.069);
MVP		0.25
MPC		0.33
ClinPred		0.26	T
GERP RS		5.0
Varity_R		0.21
gMVP		0.36
Mutation Taster		=70/30	polymorphism

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: rs1555751873; hg19: chr19-49671624; COSMIC: COSV53263207; COSMIC: COSV53263207;