NM_000528.4(MAN2B1):c.65G>A (p.Trp22Ter) AND Deficiency of alpha-mannosidase

Germline classification:: Conflicting interpretations of pathogenicity (5 submissions)
Last evaluated:: Jan 25, 2024
Review status:: criteria provided, conflicting classifications

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000779251.18

Allele description [Variation Report for NM_000528.4(MAN2B1):c.65G>A (p.Trp22Ter)]

NM_000528.4(MAN2B1):c.65G>A (p.Trp22Ter)

Genes:

LOC130063650:ATAC-STARR-seq lymphoblastoid silent region 10156 [Gene]
MAN2B1:mannosidase alpha class 2B member 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

19p13.13

Genomic location:

Preferred name:

NM_000528.4(MAN2B1):c.65G>A (p.Trp22Ter)

HGVS:

NC_000019.10:g.12666637C>T
NG_008318.1:g.5141G>A
NG_015814.1:g.4834C>T
NM_000528.4:c.65G>AMANE SELECT
NM_001173498.2:c.65G>A
NP_000519.2:p.Trp22Ter
NP_001166969.1:p.Trp22Ter
NC_000019.9:g.12777451C>T
NM_000528.3:c.65G>A

Protein change:

W22*

Links:

dbSNP: rs766383135

NCBI 1000 Genomes Browser:

rs766383135

Molecular consequence:

NM_000528.4:c.65G>A - nonsense - [Sequence Ontology: SO:0001587]
NM_001173498.2:c.65G>A - nonsense - [Sequence Ontology: SO:0001587]

Condition(s)

Name:: Deficiency of alpha-mannosidase (MANSA)
Synonyms:: Lysosomal alpha-D-mannosidase deficiency; Alpha mannosidase B deficiency; Mannosidosis, alpha B lysosomal; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0009561; MedGen: C0024748; Orphanet: 61; OMIM: 248500

Recent activity

Clear Turn Off Turn On

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

Help

Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000915815	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 09 May 2019)	Uncertain significance (Apr 28, 2017)	germline	clinical testing	Citation Link,
SCV001232217	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Pathogenic (Jan 25, 2024)	germline	clinical testing	PubMed (3) [See all records that cite these PMIDs] 9915946, 22161967, 28492532
SCV002014556	Genome-Nilou Lab	criteria provided, single submitter (ACMG Guidelines, 2015)	Likely pathogenic (Sep 5, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV002017216	Revvity Omics, Revvity	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Oct 8, 2020)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004191849	Baylor Genetics	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Oct 16, 2023)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	no	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	unknown	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Spectrum of mutations in alpha-mannosidosis.

Berg T, Riise HM, Hansen GM, Malm D, Tranebjaerg L, Tollersrud OK, Nilssen O.

Am J Hum Genet. 1999 Jan;64(1):77-88.

PubMed [citation]

PMID:: 9915946
PMCID:: PMC1377705

Identification of 83 novel alpha-mannosidosis-associated sequence variants: functional analysis of MAN2B1 missense mutations.

Riise Stensland HM, Klenow HB, Van Nguyen L, Hansen GM, Malm D, Nilssen Ø.

Hum Mutat. 2012 Mar;33(3):511-20. doi: 10.1002/humu.22005. Epub 2012 Jan 23. Erratum in: Hum Mutat. 2016 Aug;37(8):827.

PubMed [citation]

PMID:: 22161967

See all PubMed Citations (4)

Details of each submission

From Illumina Laboratory Services, Illumina, SCV000915815.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

The MAN2B1 c.65G>A (p.Trp22Ter) variant is a stop-gained variant that is predicted to result in premature truncation of the protein. A literature search was performed for the gene, cDNA change, and amino acid change. No publications were found based on this search. This variant is not found in the 1000 Genomes Project, the Exome Sequencing Project, or the Exome Aggregation Consortium, but coverage of the genomic region is poor. Based on the variant frequency, disease prevalence, disease penetrance, and inheritance mode, this variant could not be ruled out of causing disease. Due to the potential impact of stop-gained variants and the lack of clarifying evidence, this variant is classified as a variant of unknown significance, but suspicious for pathogenicity for alpha-mannosidosis. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Invitae, SCV001232217.5

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (3)

Description

This sequence change creates a premature translational stop signal (p.Trp22*) in the MAN2B1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MAN2B1 are known to be pathogenic (PMID: 9915946, 22161967). This variant is present in population databases (rs766383135, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with MAN2B1-related conditions. ClinVar contains an entry for this variant (Variation ID: 632304). For these reasons, this variant has been classified as Pathogenic.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Genome-Nilou Lab, SCV002014556.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	no	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Revvity Omics, Revvity, SCV002017216.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Baylor Genetics, SCV004191849.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	unknown	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Mar 16, 2024

ClinVar

Relating variation to medicine