8-89943291-T-C

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_002485.5(NBN):c.2146A>G(p.Asn716Asp) variant causes a missense change. The variant allele was found at a frequency of 0.00145 in 1,613,746 control chromosomes in the GnomAD database, including 34 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. N716N) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0076 ( 17 hom., cov: 32)

Exomes 𝑓: 0.00080 ( 17 hom. )

Consequence

NBN
NM_002485.5 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:17O:1

Conservation

PhyloP100: 3.72

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

Nijmegen breakage syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen, Myriad Women’s Health
rhabdomyosarcoma
Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
idiopathic aplastic anemia
Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
prostate cancer
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
hereditary breast carcinoma
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

NBN links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.005399674).

BP6

Variant 8-89943291-T-C is Benign according to our data. Variant chr8-89943291-T-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 134874.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00764 (1164/152280) while in subpopulation AFR AF = 0.027 (1122/41552). AF 95% confidence interval is 0.0257. There are 17 homozygotes in GnomAd4. There are 539 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 17 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NBN	NM_002485.5 link	c.2146A>G	p.Asn716Asp	missense_variant	Exon 14 of 16	ENST00000265433.8	NP_002476.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NBN	ENST00000265433.8 link	c.2146A>G	p.Asn716Asp	missense_variant	Exon 14 of 16	1	NM_002485.5	ENSP00000265433.4

Frequencies

GnomAD3 genomes

AF:

0.00760

AC:

1157

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0269

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00196

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:

0.0000735

Gnomad OTH

AF:

0.00335

GnomAD2 exomes

AF:

0.00196

AC:

493

AN:

251350

AF XY:

0.00150

show subpopulations

Gnomad AFR exome

AF:

0.0265

Gnomad AMR exome

AF:

0.00133

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000792

Gnomad OTH exome

AF:

0.000978

GnomAD4 exome

AF:

0.000801

AC:

1170

AN:

1461466

Hom.:

Cov.:

AF XY:

0.000707

AC XY:

514

AN XY:

727048

show subpopulations

African (AFR)

AF:

0.0287

AC:

959

AN:

33452

American (AMR)

AF:

0.00161

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39638

South Asian (SAS)

AF:

0.0000580

AC:

AN:

86244

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.000867

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000306

AC:

AN:

1111748

Other (OTH)

AF:

0.00157

AC:

AN:

60376

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

123

185

246

308

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

128

160

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00764

AC:

1164

AN:

152280

Hom.:

Cov.:

AF XY:

0.00724

AC XY:

539

AN XY:

74488

show subpopulations

African (AFR)

AF:

0.0270

AC:

1122

AN:

41552

American (AMR)

AF:

0.00196

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10632

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000735

AC:

AN:

68000

Other (OTH)

AF:

0.00331

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

108

161

215

269

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00348

Hom.:

Bravo

AF:

0.00894

ESP6500AA

AF:

0.0266

AC:

117

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00243

AC:

295

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:17Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:5Other:1

Oct 23, 2013

GeneDx

Significance: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 criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Sep 19, 2013

ITMI

Significance:not provided

Review Status:no classification provided

Collection Method:reference population

- -

Aug 19, 2015

Genetic Services Laboratory, University of Chicago

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

The NBN p.Asn716Asp variant was identified in 1 of 164 proband chromosomes (frequency: 0.006) from individuals or families with cancer and was present in 5 of 1362 control chromosomes (frequency: 0.004) from healthy individuals (Wang 2013, Bodian 2014). The variant was also identified in the following databases: dbSNP (ID: rs72563785) as "With other allele", ClinVar (5x benign, 1x uncertain significance), Clinvitae, and Zhejiang Colon Cancer Database. The variant was not identified in the Cosmic or LOVD 3.0 databases. The variant was identified in control databases in 716 of 277088 chromosomes at a frequency of 0.003 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Consortium Feb 27, 2017). The variant was identified in the following populations at a frequency greater than 1%: African in 651 of 24032 chromosomes (freq: 0.03). The p.Asn716 residue is conserved in mammals but not in more distantly related organisms. However four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; this information is not predictive enough to rule out pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing. In summary, based on the above information this variant meets our laboratory's criteria to be classified as benign. -

Jun 25, 2021

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Sep 27, 2017

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:4

Jan 06, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

NBN: BS1, BS2 -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

May 02, 2016

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

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: The c.2146A>G variant affects a conserved nucleotide, resulting in amino acid change from Asn to Asp. 3/4 in-silico tools predict this variant to be benign. This variant is found in 295/121388 control chromosomes (including 5 homozygotes) at a frequency of 0.0024302. It was predominantly observed in the African subpopulation at a frequency of 2.7% including 5 homozygous occurrences. This frequency significantly exceeds the maximal expected allele frequency for a pathogenic variant in NBN (0.25%), suggesting this is a benign polymorphism found primarily in population(s) of African origin. In addition, multiple clinical laboratories have classified this variant as benign/likely benign. One internal sample with this variant also carried a deleterious variant PMS2 c.2186_2187delTC, supporting bening outcome. Taken together, this variant has been classified as Benign. -

Microcephaly, normal intelligence and immunodeficiency

Benign:3

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Oct 31, 2019

Natera, Inc.

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jan 31, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Hereditary cancer-predisposing syndrome

Benign:3

Sep 11, 2017

True Health Diagnostics

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jul 28, 2014

Ambry Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as 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. -

Feb 04, 2016

Vantari Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aplastic anemia;C0023449:Acute lymphoid leukemia;C0398791:Microcephaly, normal intelligence and immunodeficiency

Benign:1

May 25, 2022

Fulgent Genetics, Fulgent Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Hereditary breast ovarian cancer syndrome

Benign:1

Apr 19, 2022

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

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.56

BayesDel_noAF

Benign

-0.56

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.25

T;T;.

Eigen

Benign

0.11

Eigen_PC

Uncertain

0.26

FATHMM_MKL

Uncertain

0.87

LIST_S2

Benign

0.78

T;D;T

MetaRNN

Benign

0.0054

T;T;T

MetaSVM

Benign

-0.92

MutationAssessor

Benign

1.5

L;.;.

PhyloP100

3.7

PrimateAI

Uncertain

0.58

PROVEAN

Benign

-1.7

N;N;.

REVEL

Benign

0.15

Sift

Benign

0.085

T;T;.

Sift4G

Benign

0.10

T;T;T

Polyphen

0.14

B;.;.

Vest4

0.16

MVP

0.70

MPC

0.21

ClinPred

0.015

GERP RS

5.8

Varity_R

0.20

gMVP

0.44

Mutation Taster

=91/9

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over