NM_000528.4(MAN2B1):c.2669C>G (p.Ser890Ter) AND Deficiency of alpha-mannosidase

Germline classification:: Pathogenic (5 submissions)
Last evaluated:: Nov 27, 2023
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV000668093.14

Allele description [Variation Report for NM_000528.4(MAN2B1):c.2669C>G (p.Ser890Ter)]

NM_000528.4(MAN2B1):c.2669C>G (p.Ser890Ter)

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.2669C>G (p.Ser890Ter)

HGVS:

NC_000019.10:g.12647594G>C
NG_008318.1:g.24184C>G
NM_000528.4:c.2669C>GMANE SELECT
NM_001173498.2:c.2666C>G
NP_000519.2:p.Ser890Ter
NP_001166969.1:p.Ser889Ter
NC_000019.9:g.12758408G>C
NM_000528.3:c.2669C>G

Protein change:

S889*

Links:

dbSNP: rs1406466561

NCBI 1000 Genomes Browser:

rs1406466561

Molecular consequence:

NM_000528.4:c.2669C>G - nonsense - [Sequence Ontology: SO:0001587]
NM_001173498.2:c.2666C>G - 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

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000792641	Counsyl	criteria provided, single submitter (Counsyl Autosomal Recessive and X-Linked Classification Criteria (2018))	Pathogenic (Jul 5, 2017)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID] Citation Link,
SCV001220761	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Pathogenic (Nov 29, 2022)	germline	clinical testing	PubMed (3) [See all records that cite these PMIDs] 9915946, 22161967, 28492532
SCV001364014	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	criteria provided, single submitter (LabCorp Variant Classification Summary - May 2015)	Pathogenic (May 2, 2019)	germline	clinical testing	PubMed (1) [See all records that cite this PMID] Citation Link,
SCV002014518	Genome-Nilou Lab	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Sep 5, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004191908	Baylor Genetics	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Nov 27, 2023)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID]

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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

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

See all PubMed Citations (4)

Details of each submission

From Counsyl, SCV000792641.1

#	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

From Labcorp Genetics (formerly Invitae), Labcorp, SCV001220761.5

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

Description

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 552770). This premature translational stop signal has been observed in individuals with mannosidosis (PMID: 22161967). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Ser890*) 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).

#	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 Women's Health and Genetics/Laboratory Corporation of America, LabCorp, SCV001364014.1

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

Description

Variant summary: MAN2B1 c.2669C>G (p.Ser890X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant was absent in 245278 control chromosomes (gnomAD). c.2669C>G has been reported in the literature in compound heterozygote individuals affected with Alpha-Mannosidosis (Rise Stensland_2012). These data indicate that the variant is likely associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. A ClinVar submission from a clinical diagnostic laboratory (evaluation after 2014) cites the variant as pathogenic. Based on the evidence outlined above, the variant was 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, SCV002014518.1

#	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 Baylor Genetics, SCV004191908.2

#	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: Sep 29, 2024

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