Genetic Variant MCOLN2:p.Arg319Gln (chr1-84940883-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_153259.4(MCOLN2):c.956G>A(p.Arg319Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000684 in 1,608,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000069 ( 0 hom. )

Consequence

MCOLN2
NM_153259.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.87

Variant links:

Genes affected

MCOLN2 (HGNC:13357): (mucolipin TRP cation channel 2) Mucolipins constitute a family of cation channel proteins with homology to the transient receptor potential superfamily. In mammals, the mucolipin family includes 3 members, MCOLN1 (MIM 605248), MCOLN2, and MCOLN3 (MIM 607400), that exhibit a common 6-membrane-spanning topology. Homologs of mammalian mucolipins exist in Drosophila and C. elegans. Mutations in the human MCOLN1 gene cause mucolipodosis IV (MIM 262650) (Karacsonyi et al., 2007 [PubMed 17662026]).[supplied by OMIM, Sep 2009]

MCOLN2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.100610346).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCOLN2	NM_153259.4 link	c.956G>A	p.Arg319Gln	missense_variant	Exon 8 of 14	ENST00000370608.8	NP_694991.2	Q8IZK6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MCOLN2	ENST00000370608.8 link	c.956G>A	p.Arg319Gln	missense_variant	Exon 8 of 14	1	NM_153259.4	ENSP00000359640.3	Q8IZK6-1
MCOLN2	ENST00000531325.5 link	n.1197G>A		non_coding_transcript_exon_variant	Exon 8 of 12	1
MCOLN2	ENST00000284027.5 link	c.872G>A	p.Arg291Gln	missense_variant	Exon 8 of 14	5		ENSP00000284027.5	Q8IZK6-2
MCOLN2	ENST00000463065.5 link	n.*45-2801G>A		intron_variant	Intron 7 of 11	2		ENSP00000436299.1	G5EA24

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152114

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000807

AC:

AN:

247900

Hom.:

AF XY:

0.00000746

AC XY:

AN XY:

133968

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000178

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000686

AC:

AN:

1456762

Hom.:

Cov.:

AF XY:

0.00000690

AC XY:

AN XY:

724872

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000226

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:

0.00000722

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152114

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74300

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 30, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.956G>A (p.R319Q) alteration is located in exon 8 (coding exon 8) of the MCOLN2 gene. This alteration results from a G to A substitution at nucleotide position 956, causing the arginine (R) at amino acid position 319 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.075

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Benign

-0.47

CADD

Benign

DANN

Benign

0.36

DEOGEN2

Benign

0.0020

T;.

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.065

FATHMM_MKL

Benign

0.53

LIST_S2

Benign

0.80

T;T

M_CAP

Benign

0.0045

MetaRNN

Benign

0.10

T;T

MetaSVM

Benign

-0.92

MutationAssessor

Benign

-0.85

N;.

PrimateAI

Benign

0.26

PROVEAN

Benign

2.0

N;N

REVEL

Benign

0.22

Sift

Benign

1.0

T;T

Sift4G

Benign

1.0

T;T

Polyphen

0.014

B;.

Vest4

0.13

MutPred

0.55

Gain of helix (P = 0.0199);.;

MVP

0.78

MPC

0.086

ClinPred

0.20

GERP RS

4.7

Varity_R

0.026

gMVP

0.47

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over