Genetic Variant MAN2B2:p.Val45Ala (chr4-6575344-T-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_015274.3(MAN2B2):c.134T>C(p.Val45Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000142 in 1,553,552 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000086 ( 0 hom. )

Consequence

MAN2B2
NM_015274.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.20

Variant links:

Genes affected

MAN2B2 (HGNC:29623): (mannosidase alpha class 2B member 2) Predicted to enable alpha-mannosidase activity. Predicted to be involved in mannose metabolic process. Located in extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

MAN2B2 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 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
MAN2B2	NM_015274.3 link	c.134T>C	p.Val45Ala	missense_variant	Exon 1 of 19	ENST00000285599.8	NP_056089.1	Q9Y2E5-1
MAN2B2	NM_001292038.2 link	c.134T>C	p.Val45Ala	missense_variant	Exon 1 of 19		NP_001278967.1	Q9Y2E5E9PCD7B7Z754

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MAN2B2	ENST00000285599.8 link	c.134T>C	p.Val45Ala	missense_variant	Exon 1 of 19	1	NM_015274.3	ENSP00000285599.3	Q9Y2E5-1
MAN2B2	ENST00000504248.5 link	c.134T>C	p.Val45Ala	missense_variant	Exon 1 of 19	2		ENSP00000423129.1	E9PCD7
MAN2B2	ENST00000505907.1 link	c.128T>C	p.Val43Ala	missense_variant	Exon 1 of 17	2		ENSP00000426273.1	H0YA68

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000217

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000526

AC:

AN:

190076

Hom.:

AF XY:

0.00000948

AC XY:

AN XY:

105532

show subpopulations

Gnomad AFR exome

AF:

0.0000913

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000856

AC:

AN:

1401254

Hom.:

Cov.:

AF XY:

0.0000130

AC XY:

AN XY:

691960

show subpopulations

Gnomad4 AFR exome

AF:

0.000317

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000123

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.23e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152298

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74456

show subpopulations

Gnomad4 AFR

AF:

0.000241

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000604

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 14, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.134T>C (p.V45A) alteration is located in exon 1 (coding exon 1) of the MAN2B2 gene. This alteration results from a T to C substitution at nucleotide position 134, causing the valine (V) at amino acid position 45 to be replaced by an alanine (A). 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

Uncertain

0.46

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.27

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.37

T;.

Eigen

Uncertain

0.50

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Uncertain

0.89

LIST_S2

Benign

0.86

D;D

M_CAP

Benign

0.0052

MetaRNN

Uncertain

0.61

D;D

MetaSVM

Benign

-0.84

MutationAssessor

Pathogenic

2.9

M;.

PrimateAI

Uncertain

0.76

PROVEAN

Uncertain

-2.7

D;D

REVEL

Uncertain

0.34

Sift

Uncertain

0.0020

D;D

Sift4G

Uncertain

0.0040

D;D

Polyphen

1.0

D;D

Vest4

0.51

MutPred

0.77

Loss of catalytic residue at V45 (P = 0.0043);Loss of catalytic residue at V45 (P = 0.0043);

MVP

0.35

MPC

0.42

ClinPred

0.79

GERP RS

2.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.48

gMVP

0.41

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