rs8176267

Positions:

• chr17-43061731-T-C
• chr17-43061731-T-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_007294.4(BRCA1):​c.5193+1602A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.146 in 152,006 control chromosomes in the GnomAD database, including 2,285 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency: Genomes: 𝑓 0.15 (2285 hom., cov: 30)
• Consequence: BRCA1 NM_007294.4 intron
• Clinical Significance: Benign reviewed by expert panel B:1
• Conservation: PhyloP100: 0.401

Genes affected

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.96).
• BP6: Variant 17-43061731-T-C is Benign according to our data. Variant chr17-43061731-T-C is described in ClinVar as [Benign]. Clinvar id is 209315.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43061731-T-C is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.23 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4	c.5193+1602A>G		intron_variant		ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9	c.5193+1602A>G		intron_variant		1	NM_007294.4	P4

Frequencies

GnomAD3 genomes AF: 0.146 AC: 22122 AN: 151888 Hom.: 2282 Cov.: 30

Gnomad AFR AF: 0.0384

Gnomad AMI AF: 0.260

Gnomad AMR AF: 0.236

Gnomad ASJ AF: 0.0969

Gnomad EAS AF: 0.000578

Gnomad SAS AF: 0.0784

Gnomad FIN AF: 0.189

Gnomad MID AF: 0.0823

Gnomad NFE AF: 0.202

Gnomad OTH AF: 0.125

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

GnomAD4 genome AF: 0.146 AC: 22127 AN: 152006 Hom.: 2285 Cov.: 30 AF XY: 0.145 AC XY: 10733 AN XY: 74276

Gnomad4 AFR AF: 0.0382

Gnomad4 AMR AF: 0.237

Gnomad4 ASJ AF: 0.0969

Gnomad4 EAS AF: 0.000579

Gnomad4 SAS AF: 0.0787

Gnomad4 FIN AF: 0.189

Gnomad4 NFE AF: 0.202

Gnomad4 OTH AF: 0.123

Alfa AF: 0.181 Hom.: 385

Bravo AF: 0.144

Asia WGS AF: 0.0400 AC: 142 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

Benign, reviewed by expert panel

curation

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

Jan 12, 2015

Class 1 not pathogenic based on frequency >1% in an outbred sampleset. Frequency 0.02033 (African), 0.1715 (European), derived from 1000 genomes (2012-04-30). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.96
CADD	Benign	6.3
DANN	Benign	0.41

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

Publications

LitVar

Other links and lift over

dbSNP: rs8176267; hg19: chr17-41213748;