Genetic Variant MAN1B1:p.Ala30Ala (chr9-137087089-C-G) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_ModerateBP6_ModerateBP7

The NM_016219.5(MAN1B1):c.90C>G(p.Ala30Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,447,034 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

MAN1B1
NM_016219.5 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -0.432

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 Gene-Disease associations (from GenCC):

MAN1B1-congenital disorder of glycosylation
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
Rafiq syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
autosomal recessive non-syndromic intellectual disability
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

MAN1B1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (REVEL=0.072).

BP6

Variant 9-137087089-C-G is Benign according to our data. Variant chr9-137087089-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 723181.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=-0.432 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MAN1B1	NM_016219.5 link	c.90C>G	p.Ala30Ala	synonymous_variant	Exon 1 of 13	ENST00000371589.9	NP_057303.2	Q9UKM7
MAN1B1	XM_006716945.5 link	c.90C>G	p.Ala30Ala	synonymous_variant	Exon 1 of 12		XP_006717008.1	H0YG20
MAN1B1	NR_045720.2 link	n.105C>G		non_coding_transcript_exon_variant	Exon 1 of 13
MAN1B1	NR_045721.2 link	n.105C>G		non_coding_transcript_exon_variant	Exon 1 of 14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MAN1B1	ENST00000371589.9 link	c.90C>G	p.Ala30Ala	synonymous_variant	Exon 1 of 13	1	NM_016219.5	ENSP00000360645.4		Q9UKM7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000138

AC:

AN:

1447034

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

718472

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33380

American (AMR)

AF:

0.00

AC:

AN:

42446

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25614

East Asian (EAS)

AF:

0.00

AC:

AN:

39168

South Asian (SAS)

AF:

0.00

AC:

AN:

83762

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50348

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5652

European-Non Finnish (NFE)

AF:

9.03e-7

AC:

AN:

1106896

Other (OTH)

AF:

0.0000167

AC:

AN:

59768

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.:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Oct 05, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.71

CADD

Benign

6.3

(source)

DANN

Benign

0.58

PhyloP100

-0.43

PromoterAI

-0.067

Neutral

(source)

Mutation Taster

=100/0

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