chr17-43094207-A-T

Position:

• chr17-43094207-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4 BP6

The NM_007294.4(BRCA1):​c.1324T>A​(p.Cys442Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: -1.36

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]

BRCA1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3275566).
• BP6: Variant 17-43094207-A-T is Benign according to our data. Variant chr17-43094207-A-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 545479.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.1324T>A	p.Cys442Ser	missense_variant	10/23	ENST00000357654.9	NP_009225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9	c.1324T>A	p.Cys442Ser	missense_variant	10/23	1	NM_007294.4	ENSP00000350283.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Breast cancer, susceptibility to Uncertain:1

Uncertain significance, criteria provided, single submitter

research

Cancer Molecular Diagnostics Core, Tianjin Medical University Cancer Institute and Hospital

Mar 25, 2018

- -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

curation

University of Washington Department of Laboratory Medicine, University of Washington

Mar 23, 2023

Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	0.49
DANN	Benign	0.43
DEOGEN2	Uncertain	0.52	D;.;.;.;T;T;.;.;T
Eigen	Benign	-0.94
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.044	N
LIST_S2	Benign	0.80	T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.078	D
MetaRNN	Benign	0.33	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	1.9	L;L;.;.;.;.;.;.;.
PrimateAI	Benign	0.26	T
PROVEAN	Pathogenic	-5.4	D;D;D;D;.;D;D;D;D
REVEL	Uncertain	0.52
Sift	Benign	0.061	T;T;T;T;.;T;T;T;T
Sift4G	Benign	0.43	T;T;T;T;.;T;.;T;T
Polyphen		0.62	P;.;.;B;.;.;.;.;.
Vest4		0.41
MutPred		0.58		Loss of sheet (P = 0.0037);Loss of sheet (P = 0.0037);.;Loss of sheet (P = 0.0037);.;Loss of sheet (P = 0.0037);.;.;Loss of sheet (P = 0.0037);
MVP		0.88
MPC		0.12
ClinPred		0.38	T
GERP RS		-2.2
Varity_R		0.18
gMVP		0.071

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: rs876660734; hg19: chr17-41246224;