NM_015166.4:c.1008G>T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4BS2

The NM_015166.4(MLC1):c.1008G>T(p.Gln336His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00015 in 1,609,726 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q336R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00018 ( 2 hom., cov: 34)

Exomes 𝑓: 0.00015 ( 6 hom. )

Consequence

MLC1
NM_015166.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 0.375

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

megalencephalic leukoencephalopathy with subcortical cysts 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, Myriad Women’s Health
megalencephalic leukoencephalopathy with subcortical cysts
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

MLC1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.4064023).

BS2

High Homozygotes in GnomAd4 at 2 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MLC1	NM_015166.4 link	c.1008G>T	p.Gln336His	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.1008G>T	p.Gln336His	missense_variant	Exon 11 of 12	1	NM_015166.4	ENSP00000310375.6	Q15049-1
MLC1	ENST00000395876.6 link	c.1008G>T	p.Gln336His	missense_variant	Exon 11 of 12	1		ENSP00000379216.2	Q15049-1
MLC1	ENST00000483836.1 link	n.365G>T		non_coding_transcript_exon_variant	Exon 4 of 5	2

Frequencies

GnomAD3 genomes

AF:

0.000178

AC:

AN:

151604

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000485

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000329

Gnomad ASJ

AF:

0.000579

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000221

Gnomad OTH

AF:

0.00144

GnomAD2 exomes

AF:

0.000190

AC:

AN:

247902

AF XY:

0.000178

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000232

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000102

Gnomad NFE exome

AF:

0.000320

Gnomad OTH exome

AF:

0.000164

GnomAD4 exome

AF:

0.000147

AC:

214

AN:

1458122

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

725594

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33470

American (AMR)

AF:

0.000291

AC:

AN:

44692

Ashkenazi Jewish (ASJ)

AF:

0.0000766

AC:

AN:

26116

East Asian (EAS)

AF:

0.00

AC:

AN:

39692

South Asian (SAS)

AF:

0.00

AC:

AN:

86206

European-Finnish (FIN)

AF:

0.000219

AC:

AN:

50138

Middle Eastern (MID)

AF:

0.000533

AC:

AN:

5628

European-Non Finnish (NFE)

AF:

0.000151

AC:

168

AN:

1111854

Other (OTH)

AF:

0.000282

AC:

AN:

60326

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000178

AC:

AN:

151604

Hom.:

Cov.:

AF XY:

0.000203

AC XY:

AN XY:

74032

show subpopulations

African (AFR)

AF:

0.0000485

AC:

AN:

41238

American (AMR)

AF:

0.000329

AC:

AN:

15200

Ashkenazi Jewish (ASJ)

AF:

0.000579

AC:

AN:

3456

East Asian (EAS)

AF:

0.00

AC:

AN:

5164

South Asian (SAS)

AF:

0.00

AC:

AN:

4800

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10584

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000221

AC:

AN:

67852

Other (OTH)

AF:

0.00144

AC:

AN:

2084

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.449

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000254

Hom.:

Bravo

AF:

0.000178

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000231

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000296

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Megalencephalic leukoencephalopathy with subcortical cysts 1

Uncertain:3

May 30, 2017

Mayo Clinic Laboratories, Mayo Clinic

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 13, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 31, 2018

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

not provided

Uncertain:2

Breakthrough Genomics, Breakthrough Genomics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Sep 07, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 336 of the MLC1 protein (p.Gln336His). This variant is present in population databases (rs139336504, gnomAD 0.03%). 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: 547978). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -

Inborn genetic diseases

Uncertain:1

Dec 10, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1008G>T (p.Q336H) alteration is located in exon 11 (coding exon 10) of the MLC1 gene. This alteration results from a G to T substitution at nucleotide position 1008, causing the glutamine (Q) at amino acid position 336 to be replaced by a histidine (H). 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

0.14

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.18

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.10

T;T

Eigen

Benign

-0.19

Eigen_PC

Benign

-0.34

FATHMM_MKL

Benign

0.19

LIST_S2

Benign

0.51

.;T

M_CAP

Pathogenic

0.30

MetaRNN

Benign

0.41

T;T

MetaSVM

Uncertain

-0.045

MutationAssessor

Benign

1.6

L;L

PhyloP100

0.38

PrimateAI

Uncertain

0.60

PROVEAN

Uncertain

-2.5

N;N

REVEL

Benign

0.27

Sift

Benign

0.16

T;T

Sift4G

Benign

0.27

T;T

Polyphen

0.99

D;D

Vest4

0.43

MutPred

0.23

Gain of methylation at R334 (P = 0.0454);Gain of methylation at R334 (P = 0.0454);

MVP

0.81

MPC

0.86

ClinPred

0.076

GERP RS

1.9

Varity_R

0.14

gMVP

0.25

Mutation Taster

=92/8

polymorphism

(source)

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

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NM_015166.4:c.1008G>T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over