chr8-89953684-C-A

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 0P and 3B. BP4_ModerateBP6

The NM_002485.5(NBN):c.1405G>T(p.Asp469Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000373 in 1,608,366 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00024 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

NBN
NM_002485.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:10B:2O:1

Conservation

PhyloP100: 0.391

Variant links:

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]

NBN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.115650475).

BP6

Variant 8-89953684-C-A is Benign according to our data. Variant chr8-89953684-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 134873.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=8, not_provided=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NBN	NM_002485.5 link	c.1405G>T	p.Asp469Tyr	missense_variant	Exon 11 of 16	ENST00000265433.8	NP_002476.2	O60934

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NBN	ENST00000265433.8 link	c.1405G>T	p.Asp469Tyr	missense_variant	Exon 11 of 16	1	NM_002485.5	ENSP00000265433.4		O60934

Frequencies

GnomAD3 genomes

AF:

0.000237

AC:

AN:

151992

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000821

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000409

AC:

AN:

244526

Hom.:

AF XY:

0.0000227

AC XY:

AN XY:

132420

show subpopulations

Gnomad AFR exome

AF:

0.000573

Gnomad AMR exome

AF:

0.0000293

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000165

AC:

AN:

1456374

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

724560

show subpopulations

Gnomad4 AFR exome

AF:

0.000510

Gnomad4 AMR exome

AF:

0.0000450

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.0000499

GnomAD4 genome

AF:

0.000237

AC:

AN:

151992

Hom.:

Cov.:

AF XY:

0.000269

AC XY:

AN XY:

74234

show subpopulations

Gnomad4 AFR

AF:

0.000821

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000238

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000742

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:10Benign:2Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Microcephaly, normal intelligence and immunodeficiency

Uncertain:3

Sep 16, 2020

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 12, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 469 of the NBN protein (p.Asp469Tyr). This variant is present in population databases (rs148205441, gnomAD 0.06%). This missense change has been observed in individual(s) with NBN-related cancer (PMID: 35534704, 38446568). This missense change has been observed to be homozygous, hemizygous or homoplasmic in an individual who did not have the expected clinical features for that genetic result (internal data). ClinVar contains an entry for this variant (Variation ID: 134873). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. RNA analysis performed to evaluate the impact of this missense change on mRNA splicing indicates it does not significantly alter splicing (internal data). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Nov 07, 2021

Genome-Nilou Lab

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:2

May 21, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NBN c.1405G>T (p.Asp469Tyr) variant has been reported in the published literature in individuals with pediatric glioma (PMID: 26580448 (2015)), colorectal cancer (PMID: 35534704 (2022)) as well as in reportedly healthy individuals (PMID: 24728327 (2014), 26315354 (2015)). The frequency of this variant in the general population, 0.00066 (16/24412 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded conflicting predictions that this variant is benign or damaging. Based on the available information, we are unable to determine the clinical significance of this variant. -

Apr 03, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in individuals with a personal and/or family history of breast, thyroid, or other cancers (PMID: 26580448, Lovejoy2018, 35534704); This variant is associated with the following publications: (PMID: 26580448, 24728327, 26315354, 18281469, Lovejoy2018, 35534704) -

Hereditary cancer-predisposing syndrome

Uncertain:1Benign:1

Mar 10, 2022

Sema4, Sema4

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Jul 14, 2021

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

not specified

Uncertain:1Other:1

Sep 19, 2013

ITMI

Significance: not provided

Review Status: no classification provided

Collection Method: reference population

- -

Feb 06, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: NBN c.1405G>T (p.Asp469Tyr) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4.7e-05 in 252750 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in NBN causing Nijmegen Breakage Syndrome (4.7e-05 vs 0.0025), allowing no conclusion about variant significance. c.1405G>T has been reported in the literature in settings of multigene panel testing among individuals with cancers and in unaffected controls (example, Ramus_2015, Wang_2008, Zhang_2015). These report(s) do not provide unequivocal conclusions about association of the variant with Nijmegen Breakage Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 24728327, 26315354, 18281469, 26580448). ClinVar contains an entry for this variant (Variation ID: 134873). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Aplastic anemia

Uncertain:1

Mar 25, 2024

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

NBN-related disorder

Uncertain:1

Sep 11, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The NBN c.1405G>T variant is predicted to result in the amino acid substitution p.Asp469Tyr. This variant has been reported as a germline variant in a pediatric patient with low grade glioma (Zhang et al. 2015. PubMed ID: 26580448 Table S4b) and as a somatic variant in individual(s) with pancreatic cancer (Wang et al. 2008. PubMed ID: 18281469 Table S3 ) but also was reported as a germline variant in healthy controls (Bodian et al. 2014. PubMed ID: 24728327; Ramus et al 2015. PubMed ID: 26315354 Table S4). This variant is reported in 0.066% of alleles in individuals of African descent in gnomAD and is interpreted as a variant of uncertain significance by majority of the submitters in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/134873/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Hereditary breast ovarian cancer syndrome

Uncertain:1

Apr 19, 2022

National Health Laboratory Service, Universitas Academic Hospital and University of the Free State

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary cancer

Benign:1

Feb 27, 2025

Mendelics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following: it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease, and/or has normal protein function, and/or has lack of segregation with disease, and/or has been detected in co-occurrence with known pathogenic variant, and/or has lack of disease association in case-control studies, and/or is located in a region inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.26

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.36

T;T

Eigen

Uncertain

0.35

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Benign

0.66

LIST_S2

Benign

0.85

D;T

M_CAP

Benign

0.027

MetaRNN

Benign

0.12

T;T

MetaSVM

Benign

-0.68

MutationAssessor

Uncertain

2.5

M;.

PrimateAI

Benign

0.42

PROVEAN

Uncertain

-3.4

D;D

REVEL

Benign

0.15

Sift

Uncertain

0.012

D;D

Sift4G

Benign

0.12

T;T

Polyphen

0.98

D;.

Vest4

0.39

MVP

0.74

MPC

0.089

ClinPred

0.69

GERP RS

4.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.32

gMVP

0.30

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over