Genetic Variant MAN1B1:p.Gly10Arg (chr9-137087027-G-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_016219.5(MAN1B1):c.28G>C(p.Gly10Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,449,486 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

MAN1B1
NM_016219.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.723

Publications

0 publications found

Variant links:

Genes affected

MAN1B1 (HGNC:6823): (mannosidase alpha class 1B member 1) This gene encodes an enzyme belonging to the glycosyl hydrolase 47 family. This enzyme functions in N-glycan biosynthesis, and is a class I alpha-1,2-mannosidase that specifically converts Man9GlcNAc to Man8GlcNAc isomer B. It is required for N-glycan trimming to Man5-6GlcNAc2 in the endoplasmic-reticulum-associated degradation pathway. Mutations in this gene cause autosomal-recessive intellectual disability. Alternative splicing results in multiple transcript variants. A related pseudogene has been identified on chromosome 11. [provided by RefSeq, Dec 2011]

MAN1B1 links:

MAN1B1-DT (HGNC:48715): (MAN1B1 divergent transcript)

MAN1B1-DT links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.057424426).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MAN1B1	NM_016219.5 link	c.28G>C	p.Gly10Arg	missense_variant	Exon 1 of 13	ENST00000371589.9	NP_057303.2	Q9UKM7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MAN1B1	ENST00000371589.9 link	c.28G>C	p.Gly10Arg	missense_variant	Exon 1 of 13	1	NM_016219.5	ENSP00000360645.4		Q9UKM7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.90e-7

AC:

AN:

1449486

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

719960

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33392

American (AMR)

AF:

0.00

AC:

AN:

42918

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25620

East Asian (EAS)

AF:

0.00

AC:

AN:

39254

South Asian (SAS)

AF:

0.00

AC:

AN:

83934

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50812

Middle Eastern (MID)

AF:

0.000177

AC:

AN:

5664

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1108022

Other (OTH)

AF:

0.00

AC:

AN:

59870

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Jan 16, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.28G>C (p.G10R) alteration is located in exon 1 (coding exon 1) of the MAN1B1 gene. This alteration results from a G to C substitution at nucleotide position 28, causing the glycine (G) at amino acid position 10 to be replaced by an arginine (R). 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

0.17

BayesDel_addAF

Benign

-0.27

BayesDel_noAF

Benign

-0.63

CADD

Benign

7.6

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.0027

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.045

LIST_S2

Benign

0.48

M_CAP

Benign

0.019

MetaRNN

Benign

0.057

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.69

PhyloP100

-0.72

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-0.060

REVEL

Benign

0.011

Sift

Benign

0.29

Sift4G

Benign

0.61

Polyphen

0.010

Vest4

0.16

MutPred

0.27

Gain of MoRF binding (P = 0.0081);

MVP

0.17

MPC

0.090

ClinPred

0.069

GERP RS

0.43

PromoterAI

0.021

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.041

gMVP

0.067

Mutation Taster

=99/1

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over