chr8-89943367-C-T

Variant names:

• chr8-89943367-C-T
• rs786201965
• NM_002485.5:c.2071-1G>A

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PVS1_Moderate PS3 PP5_Very_Strong

The NM_002485.5(NBN):​c.2071-1G>A variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000897 in 1,448,480 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV000634273: RNA analysis indicates that disruption of this splice site induces altered splicing and likely results in a shortened protein product. PMID:32832836".

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000090 (0 hom.)
• Consequence: NBN NM_002485.5 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 5.17
• Publications: 3 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: Pathogenic. The variant received 14 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.050331127 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PS3: PS3 evidence extracted from ClinVar submissions: SCV000634273: RNA analysis indicates that disruption of this splice site induces altered splicing and likely results in a shortened protein product. PMID: 32832836
• PP5: Variant 8-89943367-C-T is Pathogenic according to our data. Variant chr8-89943367-C-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 230924.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

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.2071-1G>A		splice_acceptor intron	N/A	NP_002476.2
	NBN	NM_001024688.3		c.1825-1G>A		splice_acceptor intron	N/A	NP_001019859.1	A0A0C4DG07
	NBN	NM_001440379.1		c.1825-1G>A		splice_acceptor intron	N/A	NP_001427308.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NBN	ENST00000265433.8	TSL:1 MANE Select	c.2071-1G>A		splice_acceptor intron	N/A	ENSP00000265433.4	O60934
	NBN	ENST00000697309.1		c.2071-1G>A		splice_acceptor intron	N/A	ENSP00000513244.1	A0A8V8TKY5
	NBN	ENST00000697293.1		c.2071-1G>A		splice_acceptor intron	N/A	ENSP00000513230.1	A0A8V8TM80

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000897 AC: 13 AN: 1448480 Hom.: 0 Cov.: 31 AF XY: 0.0000111 AC XY: 8 AN XY: 721460

African (AFR) AF: 0.00 AC: 0 AN: 33040

American (AMR) AF: 0.0000224 AC: 1 AN: 44700

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26044

East Asian (EAS) AF: 0.00 AC: 0 AN: 39570

South Asian (SAS) AF: 0.00 AC: 0 AN: 86002

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53284

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5746

European-Non Finnish (NFE) AF: 0.0000109 AC: 12 AN: 1100158

Other (OTH) AF: 0.00 AC: 0 AN: 59936

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	Microcephaly, normal intelligence and immunodeficiency (3)
1	-	-	Aplastic anemia (1)
1	-	-	Hereditary cancer-predisposing syndrome (1)
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	27
DANN	Uncertain	0.99
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		5.2
GERP RS		5.6
Mutation Taster		=8/92	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.94
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_AL_spliceai		1.0		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs786201965; hg19: chr8-90955595;