rs747721968

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong

The NM_000528.4(MAN2B1):c.1501T>A(p.Cys501Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000558 in 1,613,560 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. C501C) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

MAN2B1
NM_000528.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 4.98

Variant links:

Genes affected

MAN2B1 (HGNC:6826): (mannosidase alpha class 2B member 1) This gene encodes an enzyme that hydrolyzes terminal, non-reducing alpha-D-mannose residues in alpha-D-mannosides. Its activity is necessary for the catabolism of N-linked carbohydrates released during glycoprotein turnover and it is member of family 38 of glycosyl hydrolases. The full length protein is processed in two steps. First, a 49 aa leader sequence is cleaved off and the remainder of the protein is processed into 3 peptides of 70 kDa, 42 kDa (D) and 13/15 kDa (E). Next, the 70 kDa peptide is further processed into three peptides (A, B and C). The A, B and C peptides are disulfide-linked. Defects in this gene have been associated with lysosomal alpha-mannosidosis. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Mar 2010]

MAN2B1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.968

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
MAN2B1	NM_000528.4 linkuse as main transcript	c.1501T>A	p.Cys501Ser	missense_variant	12/24	ENST00000456935.7
MAN2B1	NM_001173498.2 linkuse as main transcript	c.1498T>A	p.Cys500Ser	missense_variant	12/24
MAN2B1	XM_005259913.3 linkuse as main transcript	c.1504T>A	p.Cys502Ser	missense_variant	12/24
MAN2B1	XM_047438841.1 linkuse as main transcript	c.400T>A	p.Cys134Ser	missense_variant	5/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MAN2B1	ENST00000456935.7 linkuse as main transcript	c.1501T>A	p.Cys501Ser	missense_variant	12/24	1	NM_000528.4	A1	O00754-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152210

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

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:

0.000478

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250324

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135630

show subpopulations

Gnomad AFR exome

AF:

0.00

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:

0.00000884

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000411

AC:

AN:

1461350

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727000

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152210

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74348

show subpopulations

Gnomad4 AFR

AF:

0.0000482

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:

0.000478

Bravo

AF:

0.0000113

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Deficiency of alpha-mannosidase

Uncertain:3

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jun 03, 2021	- -
Uncertain significance, no assertion criteria provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	Jun 07, 2012	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 22, 2021	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Aug 20, 2021

Variant summary: MAN2B1 c.1501T>A (p.Cys501Ser) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 250324 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.1501T>A has been reported in the literature in an individual affected with Type II - Alpha-Mannosidosis. The individual was compound heterozygous for the variant of interest and another pathogenic variant. However, the variant was also in cis with another variant c.2849G>C p.R950P (Borgwardt_2015). Intra cellular processing, transport and secretion studies in cell culture suggested that single mutations p.C501S and p.R950P were processed and transported to lysosomes but in the combined double variant, no indication of lysosomal localization was noted. The authors further report that whether both mutations were required for the disease development remain unknown (Kuokkanen_2011). No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Pathogenic

0.41

BayesDel_noAF

Pathogenic

0.35

Cadd

Uncertain

Dann

Uncertain

0.99

DEOGEN2

Uncertain

0.70

D;.

Eigen

Uncertain

0.30

Eigen_PC

Uncertain

0.25

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.88

D;D

M_CAP

Uncertain

0.27

MetaRNN

Pathogenic

0.97

D;D

MetaSVM

Uncertain

-0.0089

MutationAssessor

Uncertain

2.8

M;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.58

PROVEAN

Pathogenic

-9.8

D;D

REVEL

Pathogenic

0.78

Sift

Uncertain

0.0040

D;D

Sift4G

Uncertain

0.0030

D;D

Polyphen

1.0

D;.

Vest4

0.93

MutPred

0.77

Gain of disorder (P = 0.0084);.;

MVP

0.92

MPC

1.6

ClinPred

1.0

GERP RS

5.3

Varity_R

0.79

gMVP

0.95

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