8-89964428-G-C

Variant names:

• chr8-89964428-G-C
• rs121908973
• NM_002485.5:c.976C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_002485.5(NBN):​c.976C>G​(p.Gln326Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 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. Q326R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NBN NM_002485.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:6
• Conservation: PhyloP100: 3.35
• Publications: 6 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: 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 31 uncertain in NM_002485.5
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19092289).

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.976C>G	p.Gln326Glu	missense	Exon 8 of 16	NP_002476.2
	NBN	NM_001024688.3		c.730C>G	p.Gln244Glu	missense	Exon 9 of 17	NP_001019859.1
	NBN	NM_001440379.1		c.730C>G	p.Gln244Glu	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.976C>G	p.Gln326Glu	missense	Exon 8 of 16	ENSP00000265433.4
	NBN	ENST00000697309.1		c.976C>G	p.Gln326Glu	missense	Exon 8 of 15	ENSP00000513244.1
	NBN	ENST00000697293.1		c.976C>G	p.Gln326Glu	missense	Exon 8 of 17	ENSP00000513230.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Microcephaly, normal intelligence and immunodeficiency (2)
-	1	-	Aplastic anemia;C0023449:Acute lymphoid leukemia;C0398791:Microcephaly, normal intelligence and immunodeficiency (1)
-	1	-	Hereditary cancer-predisposing syndrome (1)
-	1	-	not provided (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.078
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	22
DANN	Benign	0.96
DEOGEN2	Benign	0.071	T
Eigen	Benign	-0.10
Eigen_PC	Benign	0.0034
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.58	T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-0.88	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		3.3
PrimateAI	Benign	0.21	T
PROVEAN	Benign	-0.66	N
REVEL	Benign	0.071
Sift	Benign	0.18	T
Sift4G	Benign	0.29	T
Polyphen		0.025	B
Vest4		0.30
MutPred		0.20		Gain of disorder (P = 0.1523)
MVP		0.72
MPC		0.092
ClinPred		0.41	T
GERP RS		3.6
Varity_R		0.046
gMVP		0.21
Mutation Taster		=94/6	polymorphism

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

Other links and lift over

dbSNP: rs121908973; hg19: chr8-90976656; COSMIC: COSV55373820;