rs797044823

Variant names:

• chr19-7530370-G-GCGCAGCAGGGC
• rs797044823
• NM_020533.3:c.1453_1463dupGGCCGCAGCAG

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_020533.3(MCOLN1):​c.1453_1463dupGGCCGCAGCAG​(p.Ser488ArgfsTer96) variant causes a frameshift change. The variant allele was found at a frequency of 0.0000397 in 1,613,788 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000042 (0 hom.)
• Consequence: MCOLN1 NM_020533.3 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5 O:1
• Conservation: PhyloP100: 3.60

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 Pathogenic. Variant got 18 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 19-7530370-G-GCGCAGCAGGGC is Pathogenic according to our data. Variant chr19-7530370-G-GCGCAGCAGGGC is described in ClinVar as [Likely_pathogenic]. Clinvar id is 208029.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCOLN1	NM_020533.3	c.1453_1463dupGGCCGCAGCAG	p.Ser488ArgfsTer96	frameshift_variant	Exon 12 of 14	ENST00000264079.11	NP_065394.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MCOLN1	ENST00000264079.11	c.1453_1463dupGGCCGCAGCAG	p.Ser488ArgfsTer96	frameshift_variant	Exon 12 of 14	1	NM_020533.3	ENSP00000264079.5

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152232 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

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: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000424 AC: 62 AN: 1461556 Hom.: 0 Cov.: 32 AF XY: 0.0000481 AC XY: 35 AN XY: 727084

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: 0.0000558

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152232 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74368

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Mucolipidosis type IV Pathogenic:4 Other:1

not provided, no classification provided	literature only	GeneReviews	-	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 29, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 11, 2024	This sequence change results in a frameshift in the MCOLN1 gene (p.Ser488Argfs*96). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 93 amino acid(s) of the MCOLN1 protein and extend the protein by 2 additional amino acid residues. This variant is not present in population databases (gnomAD no frequency). This frameshift has been observed in individual(s) with MCOLN1-related conditions (PMID: 11317355, 12182165). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 208029). This variant disrupts a region of the MCOLN1 protein in which other variant(s) (p.Ala539Profs*41) have been determined to be pathogenic (PMID: 18326692). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 22, 2016	Variant summary: The MCOLN1 c.1453_1463dup11 (p.Ser488Argfs) variant was classified as pathogenic. It is a frameshift mutation predicted to alter the 580 amino acid long MCOLN1 protein starting at position 488 and resulting in a STOP codon 96 amino acids downstream. The variant likely results in a loss of protein function due to nonsense mediated decay or due to production of an abnormal protein. Mutation taster predicts the variant to be disease causing. The variant is absent from the general population, while it was reported in Mucolipidosis type IV patients indicating pathogenicity. Databases list the variant with a classification of pathogenic. Considering all evidence, the variant was classified as pathogenic. -

Mucolipidosis type IV;C2749050:Lisch epithelial corneal dystrophy Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 23, 2024

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs797044823; hg19: chr19-7595256;