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rs1341763493

chr4-102634846-TTGGTC-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_StrongPM2PP5_Moderate

The NM_005908.4(MANBA):c.2352_2356del(p.Thr785LeufsTer27) variant causes a frameshift change. The variant allele was found at a frequency of 0.0000116 in 1,461,874 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. P784P) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)
Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

MANBA
NM_005908.4 frameshift

Scores

Not classified

Clinical Significance

Likely pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 5.58
Variant links:
Genes affected
MANBA (HGNC:6831): (mannosidase beta) This gene encodes a member of the glycosyl hydrolase 2 family. The encoded protein localizes to the lysosome where it is the final exoglycosidase in the pathway for N-linked glycoprotein oligosaccharide catabolism. Mutations in this gene are associated with beta-mannosidosis, a lysosomal storage disease that has a wide spectrum of neurological involvement. [provided by RefSeq, Jul 2008]

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PVS1
?
    PVS1 - null variant (nonsense, frameshift, canonical ±1 or 2 splice sites, initiation codon, single or multiexon deletion) in a gene where LOF is a known mechanism of disease
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.109 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
PM2
?
    PM2 - Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium
Very rare variant in population databases, with high coverage;
PP5
?
    PP5 - Reputable source recently reports variant as pathogenic, but the evidence is not available to the laboratory to perform an independent evaluation
Variant 4-102634846-TTGGTC-T is Pathogenic according to our data. Variant chr4-102634846-TTGGTC-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 542165.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE UniProt
MANBANM_005908.4 linkuse as main transcriptc.2352_2356del p.Thr785LeufsTer27 frameshift_variant 16/17 ENST00000647097.2
MANBAXM_047415692.1 linkuse as main transcriptc.2277_2281del p.Thr760LeufsTer27 frameshift_variant 17/18
MANBAXM_047415693.1 linkuse as main transcriptc.2277_2281del p.Thr760LeufsTer27 frameshift_variant 17/18
MANBAXM_047415694.1 linkuse as main transcriptc.1704_1708del p.Thr569LeufsTer27 frameshift_variant 12/13

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Appris UniProt
MANBAENST00000647097.2 linkuse as main transcriptc.2352_2356del p.Thr785LeufsTer27 frameshift_variant 16/17 NM_005908.4 P1

Frequencies

GnomAD3 genomes
?
    Genome Aggregation Database, over 76,156 genomes
Cov.:
33
GnomAD3 exomes
AF:
0.0000119
AC:
3
AN:
251414
Hom.:
0
AF XY:
0.00000736
AC XY:
1
AN XY:
135870
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS exome
AF:
0.00
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.0000176
Gnomad OTH exome
AF:
0.000163
GnomAD4 exome
AF:
0.0000116
AC:
17
AN:
1461874
Hom.:
0
AF XY:
0.0000151
AC XY:
11
AN XY:
727238
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.0000383
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.0000144
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
?
    Genome Aggregation Database, over 76,156 genomes
Cov.:
33

ClinVar

Significance: Likely pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

Beta-D-mannosidosis Pathogenic:1
Likely pathogenic, criteria provided, single submitterclinical testingInvitaeFeb 23, 2022In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. ClinVar contains an entry for this variant (Variation ID: 542165). This premature translational stop signal has been observed in individual(s) with mannosidosis (Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is present in population databases (no rsID available, gnomAD 0.002%). This sequence change creates a premature translational stop signal (p.Thr785Leufs*27) in the MANBA gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 95 amino acid(s) of the MANBA protein. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs1341763493; hg19: chr4-103556003; API