rs80338679
Variant summary
Our verdict is Pathogenic. Variant got 22 ACMG points: 22P and 0B. PVS1PM2PP3_StrongPP5_Very_Strong
The NM_000528.4(MAN2B1):c.2165+1G>A variant causes a splice donor change. The variant allele was found at a frequency of 0.000000685 in 1,460,896 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/2 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).
Frequency
Genomes: not found (cov: 31)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
MAN2B1
NM_000528.4 splice_donor
NM_000528.4 splice_donor
Scores
4
2
1
Splicing: ADA: 0.9999
2
Clinical Significance
Conservation
PhyloP100: 7.10
Genes affected
MAN2B1 (HGNC:6826): (mannosidase alpha class 2B member 1) This gene encodes an enzyme that hydrolyzes terminal, non-reducing alpha-D-mannose residues in alpha-D-mannosides. Its activity is necessary for the catabolism of N-linked carbohydrates released during glycoprotein turnover and it is member of family 38 of glycosyl hydrolases. The full length protein is processed in two steps. First, a 49 aa leader sequence is cleaved off and the remainder of the protein is processed into 3 peptides of 70 kDa, 42 kDa (D) and 13/15 kDa (E). Next, the 70 kDa peptide is further processed into three peptides (A, B and C). The A, B and C peptides are disulfide-linked. Defects in this gene have been associated with lysosomal alpha-mannosidosis. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Mar 2010]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 22 ACMG points.
PVS1
?
Splicing variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 3.7, offset of -20, new splice context is: tcgGTgggg. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. No scorers claiming Benign.
PP5
?
Variant 19-12650103-C-T is Pathogenic according to our data. Variant chr19-12650103-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 21209.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
MAN2B1 | NM_000528.4 | c.2165+1G>A | splice_donor_variant | ENST00000456935.7 | |||
MAN2B1 | NM_001173498.2 | c.2162+1G>A | splice_donor_variant | ||||
MAN2B1 | XM_005259913.3 | c.2168+1G>A | splice_donor_variant | ||||
MAN2B1 | XM_047438841.1 | c.1064+1G>A | splice_donor_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MAN2B1 | ENST00000456935.7 | c.2165+1G>A | splice_donor_variant | 1 | NM_000528.4 | A1 | |||
MAN2B1 | ENST00000221363.8 | c.2162+1G>A | splice_donor_variant | 1 | P4 | ||||
MAN2B1 | ENST00000466794.5 | n.2755+1G>A | splice_donor_variant, non_coding_transcript_variant | 2 |
Frequencies
GnomAD3 genomes ? Cov.: 31
GnomAD3 genomes
?
Cov.:
31
GnomAD4 exome AF: 6.85e-7 AC: 1AN: 1460896Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0AN XY: 726816
GnomAD4 exome
AF:
AC:
1
AN:
1460896
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Cov.:
33
AF XY:
AC XY:
0
AN XY:
726816
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GnomAD4 genome ? Cov.: 31
GnomAD4 genome
?
Cov.:
31
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:2Other:1
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Deficiency of alpha-mannosidase Pathogenic:2Other:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jul 30, 2023 | Studies have shown that disruption of this splice site is associated with altered splicing resulting in multiple RNA products (PMID: 9915946). ClinVar contains an entry for this variant (Variation ID: 21209). Disruption of this splice site has been observed in individuals with alpha-mannosidosis (PMID: 9915946). This variant is not present in population databases (gnomAD no frequency). This sequence change affects a donor splice site in intron 17 of the MAN2B1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in MAN2B1 are known to be pathogenic (PMID: 9915946, 22161967). This variant disrupts a region of the MAN2B1 protein in which other variant(s) (p.Trp714Arg) have been determined to be pathogenic (PMID: 9915946, 22161967). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. - |
not provided, no classification provided | literature only | GeneReviews | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 05, 2021 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Uncertain
D
MutationTaster
Benign
A;A
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DG_spliceai
Position offset: 25
DS_DL_spliceai
Position offset: 1
Find out detailed SpliceAI scores and Pangolin per-transcript scores at