Genetic Variant MGAT4B:p.Ala432Glu (chr5-179798976-G-T) – 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_014275.5(MGAT4B):c.1295C>A(p.Ala432Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,398 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A432V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MGAT4B
NM_014275.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 9.92

Publications

0 publications found

Variant links:

Genes affected

MGAT4B (HGNC:7048): (alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase B) This gene encodes a key glycosyltransferase that regulates the formation of tri- and multiantennary branching structures in the Golgi apparatus. The encoded protein, in addition to the related isoenzyme A, catalyzes the transfer of N-acetylglucosamine (GlcNAc) from UDP-GlcNAc in a beta-1,4 linkage to the Man-alpha-1,3-Man-beta-1,4-GlcNAc arm of R-Man-alpha-1,6(GlcNAc-beta-1,2-Man-alpha-1,3)Man-beta-1,4-GlcNAc-beta-1,4-GlcNAc-beta-1-Asn. The encoded protein may play a role in regulating the availability of serum glycoproteins, oncogenesis, and differentiation. [provided by RefSeq, Jul 2008]

MGAT4B 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
MGAT4B	NM_014275.5 link	c.1295C>A	p.Ala432Glu	missense_variant	Exon 11 of 15	ENST00000292591.12	NP_055090.1	Q9UQ53-1
MGAT4B	NM_054013.3 link	c.1340C>A	p.Ala447Glu	missense_variant	Exon 10 of 14		NP_463459.1	Q9UQ53-3
MGAT4B	XM_024454349.2 link	c.860C>A	p.Ala287Glu	missense_variant	Exon 11 of 15		XP_024310117.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MGAT4B	ENST00000292591.12 link	c.1295C>A	p.Ala432Glu	missense_variant	Exon 11 of 15	1	NM_014275.5	ENSP00000292591.7		Q9UQ53-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461398

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726994

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52936

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112006

Other (OTH)

AF:

0.00

AC:

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.38

BayesDel_addAF

Pathogenic

0.25

BayesDel_noAF

Uncertain

0.12

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.16

.;T

Eigen

Uncertain

0.47

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Pathogenic

0.98

M_CAP

Benign

0.026

MetaRNN

Uncertain

0.72

D;D

MetaSVM

Benign

-0.80

MutationAssessor

Uncertain

2.1

.;M

PhyloP100

9.9

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-2.0

N;N

REVEL

Uncertain

0.40

Sift

Benign

0.032

D;D

Sift4G

Benign

0.17

T;T

Polyphen

0.98

.;D

Vest4

0.84

MutPred

0.43

.;Loss of catalytic residue at A432 (P = 0.0179);

MVP

0.47

MPC

1.0

ClinPred

0.94

GERP RS

3.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.19

gMVP

0.76

Mutation Taster

=64/36

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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5-179798976-G-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over