chr19-35309916-G-A

Position:

chr19-35309916-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4BS1_Supporting

The NM_002361.4(MAG):c.1274G>A(p.Arg425Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000139 in 1,613,534 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

MAG
NM_002361.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 5.03

Variant links:

Genes affected

MAG (HGNC:6783): (myelin associated glycoprotein) The protein encoded by this gene is a type I membrane protein and member of the immunoglobulin superfamily. It is thought to be involved in the process of myelination. It is a lectin that binds to sialylated glycoconjugates and mediates certain myelin-neuron cell-cell interactions. Three alternatively spliced transcripts encoding different isoforms have been described for this gene. [provided by RefSeq, Nov 2010]

MAG links:

MAG (HGNC:):

MAG 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=0.39803705).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000112 (17/152254) while in subpopulation NFE AF= 0.000206 (14/68038). AF 95% confidence interval is 0.000124. There are 0 homozygotes in gnomad4. There are 6 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MAG	NM_002361.4 linkuse as main transcript	c.1274G>A	p.Arg425Gln	missense_variant	8/11	ENST00000392213.8	NP_002352.1	P20916-1Q53ES7
MAG	NM_001199216.2 linkuse as main transcript	c.1199G>A	p.Arg400Gln	missense_variant	8/11		NP_001186145.1	P20916-3
MAG	NM_080600.3 linkuse as main transcript	c.1274G>A	p.Arg425Gln	missense_variant	8/12		NP_542167.1	P20916-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
MAG	ENST00000392213.8 linkuse as main transcript	c.1274G>A	p.Arg425Gln	missense_variant	8/11	1	NM_002361.4	ENSP00000376048.2	P20916-1
MAG	ENST00000537831.2 linkuse as main transcript	c.1199G>A	p.Arg400Gln	missense_variant	8/11	1		ENSP00000440695.1	P20916-3
MAG	ENST00000361922.8 linkuse as main transcript	c.1274G>A	p.Arg425Gln	missense_variant	8/12	1		ENSP00000355234.4	P20916-2
MAG	ENST00000593348.1 linkuse as main transcript	n.111G>A		non_coding_transcript_exon_variant	1/3	2

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152254

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000723

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:

0.000206

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000603

AC:

AN:

248802

Hom.:

AF XY:

0.0000445

AC XY:

AN XY:

134766

show subpopulations

Gnomad AFR exome

AF:

0.0000618

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:

0.000125

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000142

AC:

208

AN:

1461280

Hom.:

Cov.:

AF XY:

0.000144

AC XY:

105

AN XY:

726970

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000183

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.000112

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74376

show subpopulations

Gnomad4 AFR

AF:

0.0000723

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:

0.000206

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.0000831

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000824

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary spastic paraplegia 75

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 22, 2022

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 425 of the MAG protein (p.Arg425Gln). This variant is present in population databases (rs144213585, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with MAG-related conditions. ClinVar contains an entry for this variant (Variation ID: 445646). 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: "Deleterious"; PolyPhen-2: "Possibly 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

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 15, 2021

The c.1274G>A (p.R425Q) alteration is located in exon 8 (coding exon 6) of the MAG gene. This alteration results from a G to A substitution at nucleotide position 1274, causing the arginine (R) at amino acid position 425 to be replaced by a glutamine (Q). Based on data from the Genome Aggregation Database (gnomAD) database, the MAG c.1274G>A alteration was observed in 0.01% (19/280178) of total alleles studied, with a frequency of 0.01% (18/127022) in the European (non-Finnish) subpopulation. This amino acid position is highly conserved in available vertebrate species. The p.R425Q alteration is predicted to be tolerated by in silico analysis. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Sep 05, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.37

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.071

T;.;.

Eigen

Uncertain

0.33

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Uncertain

0.78

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Benign

0.015

MetaRNN

Benign

0.40

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.8

L;L;.

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-0.47

N;N;N

REVEL

Benign

0.19

Sift

Benign

0.17

T;T;T

Sift4G

Benign

0.23

T;T;T

Polyphen

1.0

D;.;.

Vest4

0.59

MVP

0.53

MPC

1.1

ClinPred

0.26

GERP RS

4.8

Varity_R

0.076

gMVP

0.82

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