1-84938028-C-G

Variant summary

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

The NM_153259.4(MCOLN2):c.1165G>C(p.Val389Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MCOLN2 NM_153259.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.57

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MCOLN2	NM_153259.4	c.1165G>C	p.Val389Leu	missense_variant	10/14	ENST00000370608.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MCOLN2	ENST00000370608.8	c.1165G>C	p.Val389Leu	missense_variant	10/14	1	NM_153259.4
MCOLN2	ENST00000531325.5	n.1406G>C		non_coding_transcript_exon_variant	10/12	1
MCOLN2	ENST00000284027.5	c.1081G>C	p.Val361Leu	missense_variant	10/14	5		P1
MCOLN2	ENST00000463065.5	c.*99G>C		3_prime_UTR_variant, NMD_transcript_variant	8/12	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 20, 2023

The c.1165G>C (p.V389L) alteration is located in exon 10 (coding exon 10) of the MCOLN2 gene. This alteration results from a G to C substitution at nucleotide position 1165, causing the valine (V) at amino acid position 389 to be replaced by a leucine (L). 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	Uncertain	0.43
BayesDel_addAF	Uncertain	0.097	D
BayesDel_noAF	Benign	-0.10
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.18	T;.
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Benign	0.030	D
MetaRNN	Uncertain	0.61	D;D
MetaSVM	Benign	-0.63	T
MutationAssessor	Pathogenic	3.1	M;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-2.9	D;D
REVEL	Uncertain	0.35
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.0070	D;D
Polyphen		0.81	P;.
Vest4		0.52
MutPred		0.61		Loss of catalytic residue at V389 (P = 0.1845);.;
MVP		0.80
MPC		0.31
ClinPred		0.99	D
GERP RS		6.1
Varity_R		0.59
gMVP		0.89

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: rs1647534032; hg19: chr1-85403711; COSMIC: COSV99033505;