rs145376667

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_015166.4(MLC1):c.983G>A(p.Arg328His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000392 in 1,608,612 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000021 ( 0 hom. )

Consequence

MLC1
NM_015166.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: -0.0150

Variant links:

Genes affected

MLC1 (HGNC:17082): (modulator of VRAC current 1) The function of this gene product is unknown; however, homology to other proteins suggests that it may be an integral membrane transporter. Mutations in this gene have been associated with megalencephalic leukoencephalopathy with subcortical cysts, an autosomal recessive neurological disorder. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

MLC1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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 (MetaRNN=0.04232034).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MLC1	NM_015166.4 link	c.983G>A	p.Arg328His	missense_variant	Exon 11 of 12	ENST00000311597.10	NP_055981.1	Q15049-1A0A024R4V4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MLC1	ENST00000311597.10 link	c.983G>A	p.Arg328His	missense_variant	Exon 11 of 12	1	NM_015166.4	ENSP00000310375.6	Q15049-1
MLC1	ENST00000395876.6 link	c.983G>A	p.Arg328His	missense_variant	Exon 11 of 12	1		ENSP00000379216.2	Q15049-1
MLC1	ENST00000483836.1 link	n.340G>A		non_coding_transcript_exon_variant	Exon 4 of 5	2

Frequencies

GnomAD3 genomes

AF:

0.000220

AC:

AN:

150058

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000682

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000673

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000650

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000149

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000484

AC:

AN:

248066

Hom.:

AF XY:

0.0000519

AC XY:

AN XY:

134774

show subpopulations

Gnomad AFR exome

AF:

0.000434

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000982

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000888

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000206

AC:

AN:

1458434

Hom.:

Cov.:

AF XY:

0.0000207

AC XY:

AN XY:

725732

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000580

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000162

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.000220

AC:

AN:

150178

Hom.:

Cov.:

AF XY:

0.000232

AC XY:

AN XY:

73304

show subpopulations

Gnomad4 AFR

AF:

0.000680

Gnomad4 AMR

AF:

0.0000672

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000651

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000149

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000548

Hom.:

Bravo

AF:

0.000257

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000824

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 27, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: MLC1 c.983G>A (p.Arg328His) results in a non-conservative amino acid change in the encoded protein sequence. Three of four in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 4.8e-05 in 248066 control chromosomes (gnomAD). This frequency is not significantly higher than estimated for a pathogenic variant in MLC1 causing Megalencephalic Leukoencephalopathy With Subcortical Cysts 1 (4.8e-05 vs 0.0011), allowing no conclusion about variant significance. c.983G>A has been reported in the literature in individuals affected with bipolar affective disorder (Verma_2005). The report does not provide unequivocal conclusions about association of the variant with Megalencephalic Leukoencephalopathy With Subcortical Cysts 1. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 15992519). ClinVar contains an entry for this variant (Variation ID: 555906). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Inborn genetic diseases

Uncertain:1

Jul 29, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.983G>A (p.R328H) alteration is located in exon 11 (coding exon 10) of the MLC1 gene. This alteration results from a G to A substitution at nucleotide position 983, causing the arginine (R) at amino acid position 328 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Megalencephalic leukoencephalopathy with subcortical cysts 1

Uncertain:1

Jan 02, 2018

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Nov 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 328 of the MLC1 protein (p.Arg328His). This variant is present in population databases (rs145376667, gnomAD 0.05%). This variant has not been reported in the literature in individuals affected with MLC1-related conditions. ClinVar contains an entry for this variant (Variation ID: 555906). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MLC1 protein function. 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

AlphaMissense

Benign

0.065

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.090

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.040

T;T

Eigen

Benign

-0.77

Eigen_PC

Benign

-0.71

FATHMM_MKL

Benign

0.10

LIST_S2

Benign

0.58

.;T

M_CAP

Benign

0.057

MetaRNN

Benign

0.042

T;T

MetaSVM

Benign

-0.74

MutationAssessor

Benign

0.34

N;N

PrimateAI

Uncertain

0.55

PROVEAN

Benign

0.11

N;N

REVEL

Uncertain

0.51

Sift

Benign

0.27

T;T

Sift4G

Benign

0.27

T;T

Polyphen

0.0030

B;B

Vest4

0.17

MVP

0.63

MPC

0.40

ClinPred

0.016

GERP RS

1.8

Varity_R

0.032

gMVP

0.19

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

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