Genetic Variant MANBA:p.Thr701Lys (chr4-102635920-G-T) – 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_005908.4(MANBA):c.2102C>A(p.Thr701Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 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. T701M) has been classified as Benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

MANBA
NM_005908.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.82

Publications

76 publications found

Variant links:

Genes affected

MANBA (HGNC:6831): (mannosidase beta) This gene encodes a member of the glycosyl hydrolase 2 family. The encoded protein localizes to the lysosome where it is the final exoglycosidase in the pathway for N-linked glycoprotein oligosaccharide catabolism. Mutations in this gene are associated with beta-mannosidosis, a lysosomal storage disease that has a wide spectrum of neurological involvement. [provided by RefSeq, Jul 2008]

MANBA Gene-Disease associations (from GenCC):

beta-mannosidosis
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet, ClinGen, Genomics England PanelApp, Ambry Genetics

MANBA 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=0.046967447).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005908.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MANBA	NM_005908.4	MANE Select	c.2102C>A	p.Thr701Lys	missense	Exon 15 of 17	NP_005899.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MANBA	ENST00000647097.2	MANE Select	c.2102C>A	p.Thr701Lys	missense	Exon 15 of 17	ENSP00000495247.1
MANBA	ENST00000642252.1		c.2240C>A	p.Thr747Lys	missense	Exon 16 of 18	ENSP00000495483.1
MANBA	ENST00000644159.1		c.2102C>A	p.Thr701Lys	missense	Exon 15 of 18	ENSP00000494462.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

1457884

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725510

African (AFR)

AF:

0.00

AC:

AN:

33358

American (AMR)

AF:

0.00

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26118

East Asian (EAS)

AF:

0.00

AC:

AN:

39680

South Asian (SAS)

AF:

0.00

AC:

AN:

86178

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53398

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5752

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1108414

Other (OTH)

AF:

0.00

AC:

AN:

60266

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

97638

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.097

BayesDel_addAF

Benign

-0.23

BayesDel_noAF

Benign

-0.57

CADD

Benign

1.6

(source)

DANN

Benign

0.22

DEOGEN2

Benign

0.21

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.081

LIST_S2

Benign

0.52

M_CAP

Benign

0.0088

MetaRNN

Benign

0.047

MetaSVM

Benign

-0.99

MutationAssessor

Benign

0.0

PhyloP100

1.8

PrimateAI

Benign

0.25

PROVEAN

Benign

-1.1

REVEL

Benign

0.080

Sift

Benign

0.88

Sift4G

Benign

0.93

Polyphen

0.0050

Vest4

0.17

MutPred

0.47

Gain of methylation at T701 (P = 0.0068)

MVP

0.18

MPC

0.092

ClinPred

0.033

GERP RS

2.8

Varity_R

0.040

gMVP

0.44

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over