chr17-43127281-A-G

Variant names:

• chr17-43127281-A-G
• rs4793204
• ENST00000356906.8:n.351+1511A>G

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The ENST00000356906.8(NBR2):​n.351+1511A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.317 in 152,182 control chromosomes in the GnomAD database, including 7,976 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency: Genomes: 𝑓 0.32 (7976 hom., cov: 33)
• Consequence: NBR2 ENST00000356906.8 intron
• Clinical Significance: Benign reviewed by expert panel B:1
• Conservation: PhyloP100: -1.13
• Publications: 10 publications found

Genes affected

NBR2 (HGNC:20691): (neighbor of BRCA1 lncRNA 2) This gene was identified by its close proximity on chromosome 17 to tumor suppressor gene BRCA1. Experimental evidence indicates that the two genes share a bi-directional promoter. Transcription for either gene is controlled individually by distinct transcriptional repressor factors. A short (112 amino acid) open reading frame is observed which includes a region derived from a LINE1 element. A strong Kozak signal is not observed for the putative ORF and the stop codon is more than 55 nucleotides upstream of the last splice site for the transcript, suggesting that the transcript is subject to nonsense-mediated decay. Therefore, this gene does not appear to encode a protein. Glucose starvation induces the expression of this gene and the long non-coding RNA transcribed by it functions with AMP-activated protein kinase in mediating the energy stress response. [provided by RefSeq, Aug 2016]

BRCA1 (HGNC:1100): (BRCA1 DNA repair associated) This gene encodes a 190 kD nuclear phosphoprotein that plays a role in maintaining genomic stability, and it also acts as a tumor suppressor. The BRCA1 gene contains 22 exons spanning about 110 kb of DNA. The encoded protein combines with other tumor suppressors, DNA damage sensors, and signal transducers to form a large multi-subunit protein complex known as the BRCA1-associated genome surveillance complex (BASC). This gene product associates with RNA polymerase II, and through the C-terminal domain, also interacts with histone deacetylase complexes. This protein thus plays a role in transcription, DNA repair of double-stranded breaks, and recombination. Mutations in this gene are responsible for approximately 40% of inherited breast cancers and more than 80% of inherited breast and ovarian cancers. Alternative splicing plays a role in modulating the subcellular localization and physiological function of this gene. Many alternatively spliced transcript variants, some of which are disease-associated mutations, have been described for this gene, but the full-length natures of only some of these variants has been described. A related pseudogene, which is also located on chromosome 17, has been identified. [provided by RefSeq, May 2020]

BRCA1 Gene-Disease associations (from GenCC):

• breast-ovarian cancer, familial, susceptibility to, 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• Fanconi anemia, complementation group S

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics
• pancreatic cancer, susceptibility to, 4

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary breast ovarian cancer syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BP6: Variant 17-43127281-A-G is Benign according to our data. Variant chr17-43127281-A-G is described in ClinVar as Benign. ClinVar VariationId is 209589.Status of the report is reviewed_by_expert_panel, 3 stars.
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.476 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA1	NM_001408458.1	c.-61-11502T>C		intron_variant	Intron 1 of 21		NP_001395387.1
NBR2	NR_003108.2	n.214+1511A>G		intron_variant	Intron 1 of 4
NBR2	NR_138145.1	n.214+1511A>G		intron_variant	Intron 1 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NBR2	ENST00000356906.8	n.351+1511A>G		intron_variant	Intron 1 of 3	1
BRCA1	ENST00000634433.2	c.-19-3166T>C		intron_variant	Intron 1 of 20	5		ENSP00000489431.2
NBR2	ENST00000460115.5	n.161+1511A>G		intron_variant	Intron 1 of 4	2

Frequencies

GnomAD3 genomes AF: 0.317 AC: 48190 AN: 152064 Hom.: 7970 Cov.: 33

Gnomad AFR AF: 0.233

Gnomad AMI AF: 0.285

Gnomad AMR AF: 0.331

Gnomad ASJ AF: 0.359

Gnomad EAS AF: 0.370

Gnomad SAS AF: 0.493

Gnomad FIN AF: 0.404

Gnomad MID AF: 0.354

Gnomad NFE AF: 0.332

Gnomad OTH AF: 0.334

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.317 AC: 48224 AN: 152182 Hom.: 7976 Cov.: 33 AF XY: 0.323 AC XY: 24054 AN XY: 74398

African (AFR) AF: 0.233 AC: 9685 AN: 41526

American (AMR) AF: 0.331 AC: 5063 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.359 AC: 1245 AN: 3468

East Asian (EAS) AF: 0.369 AC: 1909 AN: 5172

South Asian (SAS) AF: 0.492 AC: 2372 AN: 4820

European-Finnish (FIN) AF: 0.404 AC: 4281 AN: 10594

Middle Eastern (MID) AF: 0.354 AC: 104 AN: 294

European-Non Finnish (NFE) AF: 0.332 AC: 22591 AN: 67988

Other (OTH) AF: 0.338 AC: 714 AN: 2112

Alfa AF: 0.597 Hom.: 7903

Bravo AF: 0.303

Asia WGS AF: 0.417 AC: 1450 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 1 Benign:1

Jan 12, 2015

Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)

Significance: Benign

Review Status: reviewed by expert panel

Collection Method: curation

Class 1 not pathogenic based on frequency >1% in an outbred sampleset. Frequency 0.33 (Asian), 0.22 (African), 0.36 (European), derived from 1000 genomes (2012-04-30). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	1.7
DANN	Benign	0.52
PhyloP100		-1.1

Splicing

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

Other links and lift over

dbSNP: rs4793204; hg19: chr17-41279298;