NM_002485.5:c.1720T>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_002485.5(NBN):c.1720T>A(p.Leu574Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00087 in 1,613,254 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L574V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00047 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00091 ( 3 hom. )

Consequence

NBN
NM_002485.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:15O:2

Conservation

PhyloP100: -0.197

Publications

9 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 -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0062530637).

BP6

Variant 8-89953369-A-T is Benign according to our data. Variant chr8-89953369-A-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 127861.

BS1

Variant frequency is greater than expected in population nfe. GnomAdExome4 allele frequency = 0.000911 (1332/1461374) while in subpopulation NFE AF = 0.00105 (1162/1111782). AF 95% confidence interval is 0.000995. There are 3 homozygotes in GnomAdExome4. There are 641 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 3 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NBN	NM_002485.5 link	c.1720T>A	p.Leu574Ile	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.1720T>A	p.Leu574Ile	missense_variant	Exon 11 of 16	1	NM_002485.5	ENSP00000265433.4		O60934

Frequencies

GnomAD3 genomes

AF:

0.000474

AC:

AN:

151762

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00104

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000796

Gnomad OTH

AF:

0.000479

GnomAD2 exomes

AF:

0.000721

AC:

181

AN:

251186

AF XY:

0.000655

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00153

Gnomad NFE exome

AF:

0.00109

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000911

AC:

1332

AN:

1461374

Hom.:

Cov.:

AF XY:

0.000882

AC XY:

641

AN XY:

727014

show subpopulations

African (AFR)

AF:

0.000120

AC:

AN:

33466

American (AMR)

AF:

0.0000671

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39660

South Asian (SAS)

AF:

0.000487

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.00148

AC:

AN:

53228

Middle Eastern (MID)

AF:

0.000867

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00105

AC:

1162

AN:

1111782

Other (OTH)

AF:

0.000613

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

144

217

289

361

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

132

176

220

<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:

0.000474

AC:

AN:

151880

Hom.:

Cov.:

AF XY:

0.000364

AC XY:

AN XY:

74234

show subpopulations

African (AFR)

AF:

0.000121

AC:

AN:

41422

American (AMR)

AF:

0.00

AC:

AN:

15264

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.000208

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00104

AC:

AN:

10562

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000796

AC:

AN:

67866

Other (OTH)

AF:

0.000474

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.493

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<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:

0.000576

Hom.:

Bravo

AF:

0.000427

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000930

AC:

ExAC

AF:

0.000758

AC:

EpiCase

AF:

0.000763

EpiControl

AF:

0.00113

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:15Other:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:7

Sep 21, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 15855896, 23555315, 28135145, 27621404, 29458332, 26928227, 14684699, 27978560, 24728327, 26787654, 26315354, 26976419) -

Jan 11, 2016

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

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jun 09, 2017

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Nov 03, 2021

Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 31, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 01, 2020

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 18, 2020

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Microcephaly, normal intelligence and immunodeficiency

Benign:4

May 18, 2021

Genome-Nilou Lab

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 14, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Apr 16, 2018

Counsyl

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Hereditary cancer-predisposing syndrome

Benign:2

Jun 22, 2016

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. -

Dec 08, 2020

Sema4, Sema4

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:curation

- -

not specified

Benign:1Other:1

Sep 19, 2013

ITMI

Significance:not provided

Review Status:no classification provided

Collection Method:reference population

- -

Apr 17, 2018

Genetic Services Laboratory, University of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Malignant tumor of breast

Benign:1

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

NBN, EXON11, c.1720T>A, p.Leu574Ile, Heterozygous, Likely Benign The NBN p.Leu574Ile variant was identified in 7 of 8650 proband chromosomes (frequency 0.0008) from individuals or families with breast and/or ovarian cancer or colorectal cancer and was present in 9 of 8838 (frequency 0.001) control chromosomes from healthy individuals (Heikkinen_2003_14684699, Tung_2016_26976419, Pearlman_2016_27978560, Ramus_2015_26315354, Bodian_2014_24728327). The variant was also identified in the following databases: dbSNP (ID: rs142334798) as â€šÃ„ÃºWith Uncertain significance, other alleleâ€šÃ„Ã¹, ClinVar and Clinvitae databases (4x classified as uncertain significance by Invitae, University of Chicago, Quest Diagnostics, ARUP; 2x classified as likely benign by Ambry Genetics and GeneDx; 1x no classification by ITMI), and the Zhejiang Colon Cancer Database (1x classified as probably pathogenic; 1x classified as pathogenicity unknown). The variant was not identified in the COSMIC or LOVD 3.0 databases. The variant was identified in control databases in 192 of 276828 chromosomes (2 homozygous) at a frequency of 0.0007 increasing the likelihood this could be a low frequency variant (Genome Aggregation Database Feb 27, 2017). Observations by population included African in 1 of 24004 chromosomes (freq: 0.000042), â€šÃ„ÃºOtherâ€šÃ„Ã¹ in 3 of 6456 chromosomes (freq: 0.000465), Latino in 3 of 34414 chromosomes (freq: 0.000087), European Non-Finnish in 130 of 126478 chromosomes (freq: 0.001028), European Finnish in 37 of 25688 chromosomes (freq: 0.00144), and South Asian in 18 of 30778 chromosomes (freq: 0.000585); the variant was not observed in the Ashkenazi Jewish, or East Asian populations. The p.Leu574Ile residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. The variant occurs outside of the splicing consensus sequence and 1 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) predict a greater than 10% difference in splicing; this is not very predictive of pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign. -

Acute lymphoid leukemia;C0027672:Hereditary cancer-predisposing syndrome

Other:1

GenomeConnect, ClinGen

Significance:not provided

Review Status:no classification provided

Collection Method:phenotyping only

Variant classified as Uncertain significance and reported on 12-08-2017 by Fulgent Genetics. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.074

BayesDel_addAF

Benign

-0.52

BayesDel_noAF

Benign

-0.57

CADD

Benign

7.1

(source)

DANN

Benign

0.89

DEOGEN2

Benign

0.23

T;T

Eigen

Benign

-0.90

Eigen_PC

Benign

-0.90

FATHMM_MKL

Benign

0.038

LIST_S2

Benign

0.75

T;T

M_CAP

Benign

0.013

MetaRNN

Benign

0.0063

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.0

M;.

PhyloP100

-0.20

PrimateAI

Benign

0.38

PROVEAN

Benign

-0.36

N;N

REVEL

Benign

0.053

Sift

Benign

0.41

T;T

Sift4G

Benign

0.45

T;T

Polyphen

0.085

B;.

Vest4

0.21

MVP

0.67

MPC

0.091

ClinPred

0.011

GERP RS

1.0

PromoterAI

0.0024

Neutral

(source)

Varity_R

0.026

gMVP

0.043

Mutation Taster

=100/0

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