17-43094372-A-T

Variant names:

• chr17-43094372-A-T
• rs876659403
• NM_007294.4:c.1159T>A

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 2P and 8B. PM2 BP6_Very_Strong

The NM_007294.4(BRCA1):​c.1159T>A​(p.Ser387Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,858 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Benign (★★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Benign reviewed by expert panel U:5 B:2
• Conservation: PhyloP100: 5.76

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 Likely_benign. Variant got -6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 17-43094372-A-T is Benign according to our data. Variant chr17-43094372-A-T is described in ClinVar as [Benign]. Clinvar id is 231852.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.1159T>A	p.Ser387Thr	missense_variant	Exon 10 of 23	ENST00000357654.9	NP_009225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9	c.1159T>A	p.Ser387Thr	missense_variant	Exon 10 of 23	1	NM_007294.4	ENSP00000350283.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461858 Hom.: 0 Cov.: 34 AF XY: 0.00000275 AC XY: 2 AN XY: 727228

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Benign

Submissions summary: Uncertain:5 Benign:2

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:2

May 03, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces serine with threonine at codon 387 of the BRCA1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in a family affected with ovarian cancer (PMID: 15131401). However, a multifactorial analysis reported a likelihood ratio for pathogenicity based on segregation of 0.0003 (PMID: 31131967). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Dec 07, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.S387T variant (also known as c.1159T>A), located in coding exon 9 of the BRCA1 gene, results from a T to A substitution at nucleotide position 1159. The serine at codon 387 is replaced by threonine, an amino acid with similar properties. In one study of 83 families with suspected hereditary breast and/or ovarian cancer syndrome, this variant was reported in two relatives with ovarian cancer from an ovarian cancer only family (Muller D et al. Fam. Cancer, 2004;3:15-20). This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

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

Sep 17, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces serine with threonine at codon 387 of the BRCA1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in a family affected with ovarian cancer (PMID: 15131401). However, a multifactorial analysis reported a likelihood ratio for pathogenicity based on segregation of 0.0003 (PMID: 31131967). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Jun 18, 2019

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

Significance: Benign

Review Status: reviewed by expert panel

Collection Method: curation

IARC class based on posterior probability from multifactorial likelihood analysis, thresholds for class as per Plon et al. 2008 (PMID: 18951446). Class 1 based on posterior probability = 6.12E-06 -

not specified Uncertain:1

May 09, 2017

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Dec 28, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Observed in an individual with personal and family history of ovarian cancer (Muller et al., 2004); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); Also known as 1278T>A; This variant is associated with the following publications: (PMID: 31131967, 20215511, 11521194, 10426999, 9582019, 9926942, 15343273, 18273839, 15131401) -

Hereditary breast ovarian cancer syndrome Benign:1

Dec 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.61	D;.;.;.;T;T;.;.;T
Eigen	Pathogenic	0.72
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.84	T;T;T;T;T;T;T;T;T
M_CAP	Pathogenic	0.35	D
MetaRNN	Uncertain	0.74	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.7	H;H;.;.;.;.;.;.;.
PrimateAI	Benign	0.38	T
PROVEAN	Uncertain	-2.9	D;D;D;D;.;D;D;D;D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.022	D;D;D;D;.;D;D;D;D
Sift4G	Uncertain	0.022	D;D;D;D;.;D;.;D;D
Polyphen		0.97	D;.;.;P;.;.;.;.;.
Vest4		0.56
MutPred		0.53		Gain of helix (P = 0.0349);Gain of helix (P = 0.0349);.;Gain of helix (P = 0.0349);.;Gain of helix (P = 0.0349);.;.;Gain of helix (P = 0.0349);
MVP		0.95
MPC		0.26
ClinPred		0.96	D
GERP RS		4.7
Varity_R		0.28
gMVP		0.17

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: rs876659403; hg19: chr17-41246389;