rs762687602

chr19-7528263-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_020533.3(MCOLN1):c.877+6C>T variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000539 in 1,612,798 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000046 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000055 (0 hom.)
• Consequence: MCOLN1 NM_020533.3 splice_donor_region, intron
• Scores: Splicing: ADA: 0.0001916
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: -0.280

Genes affected

MCOLN1 (HGNC:13356): (mucolipin TRP cation channel 1) This gene encodes a memberof the transient receptor potential (TRP) cation channel gene family. The transmembrane protein localizes to intracellular vesicular membranes including lysosomes, and functions in the late endocytic pathway and in the regulation of lysosomal exocytosis. The channel is permeable to Ca(2+), Fe(2+), Na(+), K(+), and H(+), and is modulated by changes in Ca(2+) concentration. Mutations in this gene result in mucolipidosis type IV. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MCOLN1	NM_020533.3	c.877+6C>T		splice_donor_region_variant, intron_variant		ENST00000264079.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MCOLN1	ENST00000264079.11	c.877+6C>T		splice_donor_region_variant, intron_variant		1	NM_020533.3	P1
MCOLN1	ENST00000394321.9	n.1192+6C>T		splice_donor_region_variant, intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes AF: 0.0000460 AC: 7 AN: 152164 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000837 AC: 21 AN: 250958 Hom.: 0 AF XY: 0.0000958 AC XY: 13 AN XY: 135716

Gnomad AFR exome AF: 0.0000617

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000463

Gnomad NFE exome AF: 0.000150

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000548 AC: 80 AN: 1460634 Hom.: 0 Cov.: 32 AF XY: 0.0000482 AC XY: 35 AN XY: 726664

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000375

Gnomad4 NFE exome AF: 0.0000621

Gnomad4 OTH exome AF: 0.0000994

GnomAD4 genome AF: 0.0000460 AC: 7 AN: 152164 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74328

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000130 Hom.: 0

Bravo AF: 0.0000264

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Mucolipidosis type IV Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	May 15, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 11, 2022	This sequence change falls in intron 7 of the MCOLN1 gene. It does not directly change the encoded amino acid sequence of the MCOLN1 protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs762687602, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with MCOLN1-related conditions. ClinVar contains an entry for this variant (Variation ID: 572757). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus 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
BayesDel_noAF	Benign	-0.58
Cadd	Benign	15
Dann	Benign	0.75

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00019
dbscSNV1_RF	Benign	0.088
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: rs762687602; hg19: chr19-7593149;