chr19-49210800-A-G

Position:

• chr19-49210800-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017636.4(TRPM4):​c.3419A>G​(p.Lys1140Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: TRPM4 NM_017636.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.53

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2136263).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TRPM4	NM_017636.4	c.3419A>G	p.Lys1140Arg	missense_variant	22/25	ENST00000252826.10	NP_060106.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TRPM4	ENST00000252826.10	c.3419A>G	p.Lys1140Arg	missense_variant	22/25	1	NM_017636.4	ENSP00000252826	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Progressive familial heart block type IB Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 18, 2022

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. 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. ClinVar contains an entry for this variant (Variation ID: 409635). This variant has not been reported in the literature in individuals affected with TRPM4-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 1140 of the TRPM4 protein (p.Lys1140Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Benign	23
DANN	Uncertain	0.98
DEOGEN2	Benign	0.16	T;.
Eigen	Uncertain	0.20
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.83	T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.21	T;T
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	1.5	L;.
MutationTaster	Benign	0.83	D;N;N
PrimateAI	Uncertain	0.48	T
PROVEAN	Benign	-0.27	N;N
REVEL	Benign	0.16
Sift	Benign	0.87	T;T
Sift4G	Benign	0.51	T;T
Polyphen		0.98	D;P
Vest4		0.39
MutPred		0.26		Loss of ubiquitination at K1140 (P = 0.0127);.;
MVP		0.83
MPC		0.25
ClinPred		0.83	D
GERP RS		4.1
Varity_R		0.13
gMVP		0.26

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

Other links and lift over

dbSNP: rs1060502508; hg19: chr19-49714057;