Genetic Variant MDGA2:p.Pro296Ser (chr14-47131753-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001113498.3(MDGA2):c.886C>T(p.Pro296Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000014 in 1,429,680 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

MDGA2
NM_001113498.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.55

Publications

0 publications found

Variant links:

Genes affected

MDGA2 (HGNC:19835): (MAM domain containing glycosylphosphatidylinositol anchor 2) Predicted to be involved in regulation of presynapse assembly; regulation of synaptic membrane adhesion; and spinal cord motor neuron differentiation. Predicted to act upstream of or within neuron migration and pattern specification process. Predicted to be located in extracellular region and plasma membrane. Predicted to be active in GABA-ergic synapse and glutamatergic synapse. [provided by Alliance of Genome Resources, Apr 2022]

MDGA2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MDGA2	NM_001113498.3 link	c.886C>T	p.Pro296Ser	missense_variant	Exon 5 of 17	ENST00000399232.8	NP_001106970.4	Q7Z553-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MDGA2	ENST00000399232.8 link	c.886C>T	p.Pro296Ser	missense_variant	Exon 5 of 17	1	NM_001113498.3	ENSP00000382178.4		Q7Z553-3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000140

AC:

AN:

1429680

Hom.:

Cov.:

AF XY:

0.00000141

AC XY:

AN XY:

710258

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33122

American (AMR)

AF:

0.00

AC:

AN:

44506

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25176

East Asian (EAS)

AF:

0.0000509

AC:

AN:

39318

South Asian (SAS)

AF:

0.00

AC:

AN:

82044

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52108

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5642

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1089136

Other (OTH)

AF:

0.00

AC:

AN:

58628

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 10, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.679C>T (p.R227W) alteration is located in exon 4 (coding exon 4) of the MDGA2 gene. This alteration results from a C to T substitution at nucleotide position 679, causing the arginine (R) at amino acid position 227 to be replaced by a tryptophan (W). 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

0.073

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.020

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.026

.;T

Eigen

Uncertain

0.45

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.89

D;D

M_CAP

Benign

0.0044

MetaRNN

Uncertain

0.66

D;D

MetaSVM

Benign

-0.64

MutationAssessor

Benign

0.57

.;N

PhyloP100

6.5

PrimateAI

Uncertain

0.76

PROVEAN

Benign

-2.3

N;.

REVEL

Benign

0.18

Sift

Benign

0.091

T;.

Polyphen

0.031

.;B

MutPred

0.46

.;Gain of catalytic residue at V231 (P = 0.0045);

MVP

0.24

ClinPred

0.86

GERP RS

5.3

PromoterAI

-0.030

Neutral

(source)

Varity_R

0.11

gMVP

0.60

Mutation Taster

=68/32

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.16

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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14-47131753-G-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over