9-137107427-C-T

Position:

chr9-137107427-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_016219.5(MAN1B1):c.1744C>T(p.Arg582Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00008 in 1,613,424 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00041 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000045 ( 0 hom. )

Consequence

MAN1B1
NM_016219.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 1.14

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.06795651).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000414 (63/152336) while in subpopulation AFR AF= 0.00139 (58/41578). AF 95% confidence interval is 0.00111. There are 0 homozygotes in gnomad4. There are 26 alleles in male gnomad4 subpopulation. Median coverage is 34. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
MAN1B1	NM_016219.5 linkuse as main transcript	c.1744C>T	p.Arg582Cys	missense_variant	11/13	ENST00000371589.9	NP_057303.2
MAN1B1	XM_006716945.5 linkuse as main transcript	c.1744C>T	p.Arg582Cys	missense_variant	11/12		XP_006717008.1
MAN1B1	NR_045720.2 linkuse as main transcript	n.1734C>T		non_coding_transcript_exon_variant	11/13
MAN1B1	NR_045721.2 linkuse as main transcript	n.1890C>T		non_coding_transcript_exon_variant	12/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MAN1B1	ENST00000371589.9 linkuse as main transcript	c.1744C>T	p.Arg582Cys	missense_variant	11/13	1	NM_016219.5	ENSP00000360645	P2

Frequencies

GnomAD3 genomes

AF:

0.000414

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00140

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

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:

0.000115

AC:

AN:

251178

Hom.:

AF XY:

0.0000810

AC XY:

AN XY:

135870

show subpopulations

Gnomad AFR exome

AF:

0.00154

Gnomad AMR exome

AF:

0.0000868

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

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:

0.0000452

AC:

AN:

1461088

Hom.:

Cov.:

AF XY:

0.0000399

AC XY:

AN XY:

726866

show subpopulations

Gnomad4 AFR exome

AF:

0.00140

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.000414

AC:

AN:

152336

Hom.:

Cov.:

AF XY:

0.000349

AC XY:

AN XY:

74486

show subpopulations

Gnomad4 AFR

AF:

0.00139

Gnomad4 AMR

AF:

0.000327

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

Alfa

AF:

0.000427

Hom.:

Bravo

AF:

0.000487

ESP6500AA

AF:

0.00227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000123

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

May 05, 2015

- -

Rafiq syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 21, 2022

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 582 of the MAN1B1 protein (p.Arg582Cys). This variant is present in population databases (rs142406504, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with MAN1B1-related conditions. ClinVar contains an entry for this variant (Variation ID: 211421). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C15"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Apr 03, 2017

- -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 07, 2021

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.25

BayesDel_noAF

Benign

-0.17

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.51

D;D

Eigen

Benign

-0.24

Eigen_PC

Benign

-0.43

FATHMM_MKL

Benign

0.37

LIST_S2

Benign

0.62

T;T

M_CAP

Pathogenic

0.30

MetaRNN

Benign

0.068

T;T

MetaSVM

Benign

-0.66

MutationAssessor

Benign

1.9

L;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.25

PROVEAN

Benign

-2.0

N;.

REVEL

Uncertain

0.46

Sift

Uncertain

0.014

D;.

Sift4G

Uncertain

0.032

D;D

Polyphen

0.98

D;.

Vest4

0.23

MVP

0.82

MPC

0.33

ClinPred

0.056

GERP RS

2.9

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.0

Varity_R

0.34

gMVP

0.46

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