rs878854517

Variant names:

• chr8-89964461-T-C
• rs878854517
• NM_002485.5:c.943A>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002485.5(NBN):​c.943A>G​(p.Ile315Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,646 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I315M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NBN NM_002485.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.39
• Publications: 0 publications found

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: Labcorp Genetics (formerly Invitae), Myriad Women’s Health, G2P, Orphanet, ClinGen
• 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.30079836).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002485.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NBN	NM_002485.5	MANE Select	c.943A>G	p.Ile315Val	missense	Exon 8 of 16	NP_002476.2
	NBN	NM_001024688.3		c.697A>G	p.Ile233Val	missense	Exon 9 of 17	NP_001019859.1	A0A0C4DG07
	NBN	NM_001440379.1		c.697A>G	p.Ile233Val	missense	Exon 8 of 16	NP_001427308.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NBN	ENST00000265433.8	TSL:1 MANE Select	c.943A>G	p.Ile315Val	missense	Exon 8 of 16	ENSP00000265433.4	O60934
	NBN	ENST00000697309.1		c.943A>G	p.Ile315Val	missense	Exon 8 of 15	ENSP00000513244.1	A0A8V8TKY5
	NBN	ENST00000697293.1		c.943A>G	p.Ile315Val	missense	Exon 8 of 17	ENSP00000513230.1	A0A8V8TM80

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460646 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 726722

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33428

American (AMR) AF: 0.00 AC: 0 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26116

East Asian (EAS) AF: 0.00 AC: 0 AN: 39650

South Asian (SAS) AF: 0.00 AC: 0 AN: 86244

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1110990

Other (OTH) AF: 0.00 AC: 0 AN: 60352

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.0000812204), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Hereditary cancer-predisposing syndrome (1)
-	1	-	Microcephaly, normal intelligence and immunodeficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.093	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.093
FATHMM_MKL	Benign	0.75	D
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.30	T
MetaSVM	Benign	-0.80	T
MutationAssessor	Uncertain	2.7	M
PhyloP100		1.4
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-0.73	N
REVEL	Benign	0.069
Sift	Uncertain	0.0070	D
Sift4G	Uncertain	0.021	D
Polyphen		0.14	B
Vest4		0.37
MutPred		0.37		Gain of catalytic residue at I315 (P = 0.0559)
MVP		0.71
MPC		0.063
ClinPred		0.62	D
GERP RS		3.0
Varity_R		0.14
gMVP		0.28
Mutation Taster		=64/36	polymorphism

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

Other links and lift over

dbSNP: rs878854517; hg19: chr8-90976689;