15-31028454-A-T

Position:

• chr15-31028454-A-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001252024.2(TRPM1):​c.3171T>A​(p.Tyr1057*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000013 in 1,461,808 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 Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: TRPM1 NM_001252024.2 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 0.0460

Genes affected

TRPM1 (HGNC:7146): (transient receptor potential cation channel subfamily M member 1) This gene encodes a member of the transient receptor potential melastatin subfamily of transient receptor potential ion channels. The encoded protein is a calcium permeable cation channel that is expressed in melanocytes and may play a role in melanin synthesis. Specific mutations in this gene are the cause autosomal recessive complete congenital stationary night blindness-1C. The expression of this protein is inversely correlated with melanoma aggressiveness and as such it is used as a prognostic marker for melanoma metastasis. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Oct 2011]

TRPM1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-31028454-A-T is Pathogenic according to our data. Variant chr15-31028454-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 6225.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr15-31028454-A-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TRPM1	NM_001252024.2	c.3171T>A	p.Tyr1057*	stop_gained	25/28	ENST00000256552.11	NP_001238953.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TRPM1	ENST00000256552.11	c.3171T>A	p.Tyr1057*	stop_gained	25/28	1	NM_001252024.2	ENSP00000256552.7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000130 AC: 19 AN: 1461808 Hom.: 0 Cov.: 32 AF XY: 0.0000138 AC XY: 10 AN XY: 727212

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: 0.0000171

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital stationary night blindness 1C Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 01, 2009

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 05, 2023

This sequence change creates a premature translational stop signal (p.Tyr1035*) in the TRPM1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TRPM1 are known to be pathogenic (PMID: 19896113, 19966281, 20300565). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with night blindness (PMID: 19878917). ClinVar contains an entry for this variant (Variation ID: 6225). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	34
DANN	Uncertain	1.0
Eigen	Benign	0.073
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.51	D
Vest4		0.91
GERP RS		-2.0

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: rs267607140; hg19: chr15-31320657;