chr9-137107456-G-C

Variant names:

• chr9-137107456-G-C
• rs377406887
• NM_016219.5:c.1764+9G>C

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_016219.5(MAN1B1):​c.1764+9G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000477 in 1,613,308 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 Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 34)
  • Exomes 𝑓: 0.000049 (0 hom.)
• Consequence: MAN1B1 NM_016219.5 intron
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1 B:1
• Conservation: PhyloP100: -0.0730
• Publications: 0 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.71).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016219.5. 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
	MAN1B1	NM_016219.5	MANE Select	c.1764+9G>C		intron	N/A	NP_057303.2
	MAN1B1	NR_045720.2		n.1754+9G>C		intron	N/A
	MAN1B1	NR_045721.2		n.1910+9G>C		intron	N/A

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MAN1B1	ENST00000371589.9	TSL:1 MANE Select	c.1764+9G>C		intron	N/A	ENSP00000360645.4
	MAN1B1	ENST00000371587.9	TSL:1	n.*1441+9G>C		intron	N/A	ENSP00000483132.2
	MAN1B1	ENST00000544448.6	TSL:1	n.*86+9G>C		intron	N/A	ENSP00000444966.2

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152204 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000188

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000956 AC: 24 AN: 251060 AF XY: 0.0000884

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000381

Gnomad FIN exome AF: 0.0000925

Gnomad NFE exome AF: 0.0000969

Gnomad OTH exome AF: 0.000653

GnomAD4 exome AF: 0.0000493 AC: 72 AN: 1460986 Hom.: 0 Cov.: 31 AF XY: 0.0000468 AC XY: 34 AN XY: 726814

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

East Asian (EAS) AF: 0.000428 AC: 17 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.000190 AC: 10 AN: 52598

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000234 AC: 26 AN: 1111956

Other (OTH) AF: 0.000315 AC: 19 AN: 60382

GnomAD4 genome AF: 0.0000328 AC: 5 AN: 152322 Hom.: 0 Cov.: 34 AF XY: 0.0000403 AC XY: 3 AN XY: 74494

African (AFR) AF: 0.00 AC: 0 AN: 41574

American (AMR) AF: 0.00 AC: 0 AN: 15310

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.000188 AC: 2 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68022

Other (OTH) AF: 0.00 AC: 0 AN: 2112

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.0000113

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Oct 22, 2015

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

MAN1B1-related disorder Benign:1

Sep 23, 2019

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.71
CADD	Benign	7.5
DANN	Benign	0.73
PhyloP100		-0.073
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

Other links and lift over

dbSNP: rs377406887; hg19: chr9-140001908;