chr8-89970463-G-A

Position:

chr8-89970463-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_002485.5(NBN):c.797C>T(p.Pro266Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00163 in 1,613,812 control chromosomes in the GnomAD database, including 41 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P266A) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0088 ( 20 hom., cov: 32)

Exomes 𝑓: 0.00088 ( 21 hom. )

Consequence

NBN
NM_002485.5 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 6.34

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 Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.008543104).

BP6

Variant 8-89970463-G-A is Benign according to our data. Variant chr8-89970463-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 134878.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-89970463-G-A is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00878 (1336/152126) while in subpopulation AFR AF= 0.0311 (1288/41450). AF 95% confidence interval is 0.0297. There are 20 homozygotes in gnomad4. There are 595 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 20 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NBN	NM_002485.5 linkuse as main transcript	c.797C>T	p.Pro266Leu	missense_variant	7/16	ENST00000265433.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NBN	ENST00000265433.8 linkuse as main transcript	c.797C>T	p.Pro266Leu	missense_variant	7/16	1	NM_002485.5	P1

Frequencies

GnomAD3 genomes

AF:

0.00877

AC:

1333

AN:

152008

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0311

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00197

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00432

GnomAD3 exomes

AF:

0.00219

AC:

550

AN:

251250

Hom.:

AF XY:

0.00158

AC XY:

214

AN XY:

135790

show subpopulations

Gnomad AFR exome

AF:

0.0299

Gnomad AMR exome

AF:

0.00124

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000489

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.000490

GnomAD4 exome

AF:

0.000884

AC:

1292

AN:

1461686

Hom.:

Cov.:

AF XY:

0.000794

AC XY:

577

AN XY:

727150

show subpopulations

Gnomad4 AFR exome

AF:

0.0321

Gnomad4 AMR exome

AF:

0.00145

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000378

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000297

Gnomad4 OTH exome

AF:

0.00162

GnomAD4 genome

AF:

0.00878

AC:

1336

AN:

152126

Hom.:

Cov.:

AF XY:

0.00800

AC XY:

595

AN XY:

74392

show subpopulations

Gnomad4 AFR

AF:

0.0311

Gnomad4 AMR

AF:

0.00196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000386

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00428

Alfa

AF:

0.00219

Hom.:

Bravo

AF:

0.00975

ESP6500AA

AF:

0.0302

AC:

133

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00256

AC:

311

Asia WGS

AF:

0.000577

AC:

AN:

3478

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:4Other:1

not provided, no classification provided	reference population	ITMI	Sep 19, 2013	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Oct 11, 2017	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 05, 2014	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. -
Benign, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The NBN p.Pro266Leu variant was identified in 14 of 2874 proband chromosomes (frequency: 0.005) from individuals or families with various types of cancer and was present in 4 of 1362 control chromosomes (frequency: 0.003) from healthy individuals (Berg 2013, Bodian 2014, Desjardins 2009, Yurgelun 2015). The variant was also identified in the following databases: dbSNP (ID: rs769420) as "With Benign allele", ClinVar (5x benign), Clinvitae (4x benign), and the Zhejiang Colon Cancer Database (1x). The variant was not identified in Cosmic or the LOVD 3.0 database. The variant was identified in control databases in 771 of 276952 chromosomes (11 homozygous) at a frequency of 0.003 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). Breakdown of the observations by population include African in 705 of 24006 chromosomes (freq: 0.03), Other in 5 of 6454 chromosomes (freq: 0.0008), Latino in 44 of 34382 chromosomes (freq: 0.001), European in 4 of 126556 chromosomes (freq: 0.00003), East Asian in 9 of 18864 chromosomes (freq: 0.0005), and South Asian in 4 of 30776 chromosomes (freq: 0.0001). The variant was not observed in the Ashkenazi Jewish or Finnish populations. Various studies utilizing computational algorithms, personal disease history, and family disease history have been performed; most of these studies conclude the variant is not associated with cancer (Berg 2013, Berardinelli 2013, Bodian 2014, Desjardins 2009, Gao 2013, Yurgelun 2015). The p.Pro266 residue is conserved in mammals but not in more distantly related organisms, and four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the leucine variant may impact the protein; however, this information is not predictive enough to assume 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 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. -
Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Oct 28, 2020	- -

not provided

Benign:4

Benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	May 01, 2024	NBN: BP4, BS1, BS2 -
Benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Dec 30, 2016	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jul 23, 2021	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Microcephaly, normal intelligence and immunodeficiency

Benign:3

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -
Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 12, 2019	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 28, 2017	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 rule this variant out of causing disease. Therefore, this variant is classified as benign. -

Hereditary cancer-predisposing syndrome

Benign:3

Likely benign, no assertion criteria provided	clinical testing	True Health Diagnostics	Feb 20, 2018	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 12, 2014	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. -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	May 21, 2020	- -

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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 07, 2021

- -

Acute lymphoid leukemia

Benign:1

Benign, criteria provided, single submitter

clinical testing

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Jul 07, 2023

- -

Hereditary breast ovarian cancer syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

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

Apr 19, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.24

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.35

T;T

Eigen

Pathogenic

0.69

Eigen_PC

Uncertain

0.62

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.90

D;D

MetaRNN

Benign

0.0085

T;T

MetaSVM

Benign

-0.35

MutationAssessor

Pathogenic

2.9

M;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Benign

0.41

PROVEAN

Pathogenic

-5.7

D;D

REVEL

Benign

0.29

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.0030

D;D

Polyphen

1.0

D;.

Vest4

0.66

MVP

0.82

MPC

0.35

ClinPred

0.033

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.44

gMVP

0.58

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.12

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