NM_002485.5:c.3G>A

Variant names:

• chr8-89984559-C-T
• rs1554569682
• NM_002485.5:c.3G>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_002485.5(NBN):​c.3G>A​(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.000000685 in 1,460,816 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NBN NM_002485.5 start_lost
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 3.64
• 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

ENSG00000309953 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 71 pathogenic variants. Next in-frame start position is after 83 codons. Genomic position: 89981448. Lost 0.109 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

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.3G>A	p.Met1?	start_lost	Exon 1 of 16	NP_002476.2
	NBN	NM_001024688.3		c.-294G>A		5_prime_UTR_premature_start_codon_gain	Exon 1 of 17	NP_001019859.1	A0A0C4DG07
	NBN	NM_001024688.3		c.-294G>A		5_prime_UTR	Exon 1 of 17	NP_001019859.1	A0A0C4DG07

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NBN	ENST00000265433.8	TSL:1 MANE Select	c.3G>A	p.Met1?	start_lost	Exon 1 of 16	ENSP00000265433.4	O60934
	NBN	ENST00000523444.2	TSL:4	c.-294G>A		5_prime_UTR_premature_start_codon_gain	Exon 1 of 17	ENSP00000428252.2	A0A0C4DG07
	NBN	ENST00000697298.1		c.-477G>A		5_prime_UTR_premature_start_codon_gain	Exon 1 of 18	ENSP00000513234.1	A0A0C4DG07

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460816 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726782

African (AFR) AF: 0.00 AC: 0 AN: 33450

American (AMR) AF: 0.00 AC: 0 AN: 44710

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39684

South Asian (SAS) AF: 0.00 AC: 0 AN: 86232

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52828

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111762

Other (OTH) AF: 0.00 AC: 0 AN: 60300

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Microcephaly, normal intelligence and immunodeficiency (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.22
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.41	T
Eigen	Uncertain	0.28
Eigen_PC	Benign	0.21
FATHMM_MKL	Benign	0.089	N
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.85	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	-0.050	T
PhyloP100		3.6
PROVEAN	Uncertain	-2.6	D
REVEL	Pathogenic	0.68
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.98	D
Vest4		0.92
MutPred		0.95		Loss of disorder (P = 0.0695)
MVP		0.80
ClinPred		1.0	D
GERP RS		3.7
PromoterAI		0.058	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.92
gMVP		0.77
Mutation Taster		=10/190	disease causing (ClinVar)

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: rs1554569682; hg19: chr8-90996787;