rs1057516772
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Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_ModeratePM2PP5_Very_Strong
The NM_002485.5(NBN):c.163_171+3del variant causes a splice donor, splice donor region, coding sequence, intron change. The variant allele was found at a frequency of 0.000000685 in 1,459,762 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. T55T) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 6.9e-7 ( 0 hom. )
Consequence
NBN
NM_002485.5 splice_donor, splice_donor_region, coding_sequence, intron
NM_002485.5 splice_donor, splice_donor_region, coding_sequence, intron
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 6.66
Genes affected
NBN (HGNC:7652): (nibrin) Mutations in this gene are associated with Nijmegen breakage syndrome, an autosomal recessive chromosomal instability syndrome characterized by microcephaly, growth retardation, immunodeficiency, and cancer predisposition. The encoded protein is a member of the MRE11/RAD50 double-strand break repair complex which consists of 5 proteins. This gene product is thought to be involved in DNA double-strand break repair and DNA damage-induced checkpoint activation. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
?
Splicing variant, NOT destroyed by nmd, known LOF gene, truncates exone, which is 0.058719646 fraction of the gene. Cryptic splice site detected, with MaxEntScore 3.9, offset of 0 (no position change), new splice context is: tctGTatgt. Cryptic site results in inframe 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;
PP5
?
Variant 8-89982718-ATACCAGGTTGGT-A is Pathogenic according to our data. Variant chr8-89982718-ATACCAGGTTGGT-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370793.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
NBN | NM_002485.5 | c.163_171+3del | splice_donor_variant, splice_donor_region_variant, coding_sequence_variant, intron_variant | 2/16 | ENST00000265433.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
NBN | ENST00000265433.8 | c.163_171+3del | splice_donor_variant, splice_donor_region_variant, coding_sequence_variant, intron_variant | 2/16 | 1 | NM_002485.5 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome AF: 6.85e-7 AC: 1AN: 1459762Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 726374
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GnomAD4 genome ? Cov.: 32
GnomAD4 genome
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32
ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:6
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Microcephaly, normal intelligence and immunodeficiency Pathogenic:3
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Mar 30, 2022 | In 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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 370793). This variant has not been reported in the literature in individuals affected with NBN-related conditions. This variant is not present in population databases (gnomAD no frequency). This variant results in the deletion of part of exon 2 (c.163_171+3del) of the NBN 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 NBN are known to be pathogenic (PMID: 9590180, 16415040). - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Counsyl | Apr 15, 2016 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Nov 07, 2021 | - - |
Aplastic anemia Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Apr 04, 2023 | - - |
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Mar 20, 2024 | Canonical splice site variant predicted to result in a null allele in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 34933735, 37453313, 29760218) - |
Hereditary cancer-predisposing syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 06, 2019 | The c.163_171+3del12 variant results from a deletion of 12 coding nucleotides at the 3' end of coding exon 2 in the NBN gene. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD) (Lek M et al. Nature, 2016 08;536:285-91). Using the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to weaken this splice donor site. RNA studies have demonstrated that this alteration results in abnormal splicing in the set of samples tested (Ambry internal data). This alteration is expected to result in loss of function due to an abnormal transcript, a translational frameshift leading to premature truncation, or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. - |
Computational scores
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Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at