17-43115746-C-T

Position:

• chr17-43115746-C-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_007294.4(BRCA1):​c.114G>A​(p.Lys38=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.002 in 1,613,626 control chromosomes in the GnomAD database, including 89 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

• Frequency:
  • Genomes: 𝑓 0.0029 (9 hom., cov: 32)
  • Exomes 𝑓: 0.0019 (80 hom.)
• Consequence: BRCA1 NM_007294.4 synonymous
• Clinical Significance: Benign reviewed by expert panel B:31 O:1
• Conservation: PhyloP100: -0.475

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 -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.61).
• BP6: Variant 17-43115746-C-T is Benign according to our data. Variant chr17-43115746-C-T is described in ClinVar as [Benign]. Clinvar id is 54146.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43115746-C-T is described in Lovd as [Benign]. Variant chr17-43115746-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-0.475 with no splicing effect.
• BA1: GnomAdExome4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.053 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4	c.114G>A	p.Lys38=	synonymous_variant	3/23	ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9	c.114G>A	p.Lys38=	synonymous_variant	3/23	1	NM_007294.4	P4

Frequencies

GnomAD3 genomes AF: 0.00296 AC: 450 AN: 152104 Hom.: 9 Cov.: 32

Gnomad AFR AF: 0.000338

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0132

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0443

Gnomad SAS AF: 0.000620

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.000479

GnomAD3 exomes AF: 0.00444 AC: 1113 AN: 250826 Hom.: 19 AF XY: 0.00362 AC XY: 491 AN XY: 135586

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.0105

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0393

Gnomad SAS exome AF: 0.000164

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.00000882

Gnomad OTH exome AF: 0.00278

GnomAD4 exome AF: 0.00190 AC: 2773 AN: 1461404 Hom.: 80 Cov.: 30 AF XY: 0.00180 AC XY: 1306 AN XY: 726984

Gnomad4 AFR exome AF: 0.000269

Gnomad4 AMR exome AF: 0.00965

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0550

Gnomad4 SAS exome AF: 0.000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000989

Gnomad4 OTH exome AF: 0.00200

GnomAD4 genome AF: 0.00295 AC: 449 AN: 152222 Hom.: 9 Cov.: 32 AF XY: 0.00376 AC XY: 280 AN XY: 74418

Gnomad4 AFR AF: 0.000337

Gnomad4 AMR AF: 0.0132

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.0442

Gnomad4 SAS AF: 0.000621

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.000474

Alfa AF: 0.000289 Hom.: 0

Bravo AF: 0.00320

Asia WGS AF: 0.0150 AC: 52 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Benign

Submissions summary: Benign:31 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

not specified Benign:10

Benign, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The BRCA1 p.Lys38= variant was identified in 16 of 604 proband chromosomes (frequency: 0.026) from Asian and Colombian individuals or families with hereditary breast and/or ovarian cancer or early-onset breast cancer and was present in 3 of 142 control chromosomes (frequency: 0.021) from healthy individuals (Torres_2007_17080309, Ho_2000_10951344, Chen_2003_12602912, Song_2006_16835750, Toh_2008_18431501). The variant was also identified in dbSNP (ID: rs1800062) as “With Uncertain significance, other allele”, ClinVar and Clinvitae (11x classified as benign by ENIGMA, Laboratory Corporation of America, Baylor Miraca Genetics, British Columbia Cancer Agency (COGR), Sinai Health System (COGR), ARUP Laboratories, Invitae, Counsyl, Ambry Genetics, SCRP, BIC; 2x classified as likely benign by Illumina Clinical Services and CHEO), GeneInsight-COGR (classified as likely benign/benign by COGR consensus and Sinai Health System), LOVD 3.0 (11 entries, classified as does not affect function or not classified), UMD-LSDB (37 entries, 2 of which have co-occurring pathogenic variants), BIC Database (18 entries, classified as not pathogenic), and the Zhejiang Colon Cancer Database (5 entries classified as no known pathogenicity). The variant was not identified in the COSMIC, MutDB, or ARUP Laboratories databases. The variant was identified in control databases in 1135 of 276592 chromosomes (18 homozygous) at a frequency of 0.004 increasing the likelihood this could be a low frequency variant (Genome Aggregation Database Feb 27, 2017). Breakdown of the observations by population include African in 4 of 23984 chromosomes (freq: 0.0002), Other in 13 of 6450 chromosomes (freq: 0.002), Latino in 368 of 34346 chromosomes (freq: 0.01), European Non-Finnish in 2 of 126380 chromosomes (freq: 0.00002), East Asian in 741 of 18846 chromosomes (freq: 0.04), European Finnish in 1 of 25776 chromosomes (freq: 0.00004), and South Asian in 6 of 30688 chromosomes (freq: 0.0002) while the variant was not observed in the Ashkenazi Jewish population. The p.Lys38= variant is not expected to have clinical significance because it does not result in a change of amino acid and is not located in a known consensus splice site. The variant occurs outside of the splicing consensus sequence and 2 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) predict a greater than 10% difference in splicing. However, this information is not predictive enough to assume pathogenicity. In summary, based on the above information this variant meets our laboratory's criteria to be classified as benign. -
Benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneKor MSA	Nov 01, 2017	- -
Benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Benign, criteria provided, single submitter	clinical testing	Cancer Genetics and Genomics Laboratory, British Columbia Cancer Agency	Apr 18, 2017	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute	-	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Jun 28, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jun 15, 2020	- -

Breast-ovarian cancer, familial, susceptibility to, 1 Benign:6 Other:1

Benign, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA1)	Jul 19, 2006	- -
not provided, no classification provided	in vitro	Brotman Baty Institute, University of Washington	-	- -
Benign, criteria provided, single submitter	literature only	Counsyl	Mar 13, 2014	- -
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 0.05769 (Asian), derived from 1000 genomes (2012-04-30). -
Benign, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Mar 03, 2011	- -
Benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Mar 06, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:5

Benign, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Dec 19, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Nov 03, 2021	- -
Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 07, 2023	- -
Benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2023	BRCA1: BP4, BP7, BS1, BS2 -

Hereditary cancer-predisposing syndrome Benign:4

Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 18, 2014	This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	May 11, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 13, 2015	- -
Likely benign, no assertion criteria provided	clinical testing	True Health Diagnostics	Sep 13, 2017	- -

Hereditary breast ovarian cancer syndrome Benign:4

Benign, criteria provided, single submitter	research	Genetics Program, Instituto Nacional de Cancer	Nov 01, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Invitae	Feb 01, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 19, 2014	- -
Benign, criteria provided, single submitter	clinical testing	National Health Laboratory Service, Universitas Academic Hospital and University of the Free State	Apr 19, 2022	- -

Breast and/or ovarian cancer Benign:1

Benign, criteria provided, single submitter

clinical testing

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Nov 09, 2021

- -

Familial cancer of breast Benign:1

Benign, criteria provided, single submitter

clinical testing

Baylor Genetics

Feb 23, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.61
CADD	Benign	5.2
DANN	Benign	0.54

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: rs1800062; hg19: chr17-41267763;