17-43106501-T-A

Position:

• chr17-43106501-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_007294.4(BRCA1):​c.167A>T​(p.Lys56Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as not provided (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 2.03

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 Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a zinc_finger_region RING-type (size 41) in uniprot entity BRCA1_HUMAN there are 65 pathogenic changes around while only 6 benign (92%) in NM_007294.4
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.167A>T	p.Lys56Ile	missense_variant	4/23	ENST00000357654.9	NP_009225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9	c.167A>T	p.Lys56Ile	missense_variant	4/23	1	NM_007294.4	ENSP00000350283	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

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

not provided, no classification provided

in vitro

Brotman Baty Institute, University of Washington

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.45	.;T;.;.;.;.;T;.;.;T;T;T;T;.
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.70	D
MetaRNN	Uncertain	0.67	D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.42	D
MutationAssessor	Benign	0.89	L;L;L;L;.;L;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;N;N;N;N;N
PrimateAI	Uncertain	0.59	T
PROVEAN	Benign	-2.0	N;N;N;N;N;N;D;N;N;.;N;N;D;.
REVEL	Pathogenic	0.74
Sift	Uncertain	0.0060	D;D;D;D;D;D;D;D;D;.;D;D;D;.
Sift4G	Uncertain	0.018	D;D;D;D;D;D;.;D;D;.;D;D;.;.
Polyphen		0.99, 1.0, 0.98	.;D;.;.;.;D;.;.;D;.;.;.;.;.
Vest4		0.48
MutPred		0.57		Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);.;Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);.;Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);.;
MVP		0.85
MPC		0.41
ClinPred		0.85	D
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.47
gMVP		0.51

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.32		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.32		Position offset: 32

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

Publications

LitVar

Other links and lift over

dbSNP: rs397508897; hg19: chr17-41258518;