rs1555589344

Positions:

• chr17-43092954-A-C
• chr17-43092954-A-G
• chr17-43092954-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_007294.4(BRCA1):​c.2577T>G​(p.Asn859Lys) 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 pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N859I) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.597

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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-43092955-T-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.759

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.2577T>G	p.Asn859Lys	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.2577T>G	p.Asn859Lys	missense_variant	10/23	1	NM_007294.4	ENSP00000350283	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 41

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Uncertain	0.090	D
BayesDel_noAF	Benign	-0.11
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.54	D;.;.;.
Eigen	Uncertain	0.20
Eigen_PC	Benign	0.17
FATHMM_MKL	Benign	0.70	D
LIST_S2	Benign	0.79	T;T;T;T
M_CAP	Uncertain	0.22	D
MetaRNN	Pathogenic	0.76	D;D;D;D
MetaSVM	Uncertain	-0.022	T
MutationAssessor	Uncertain	2.8	M;M;.;.
MutationTaster	Benign	0.83	D;D;D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.53	T
PROVEAN	Pathogenic	-4.6	D;D;D;D
REVEL	Uncertain	0.62
Sift	Uncertain	0.013	D;D;D;D
Sift4G	Uncertain	0.016	D;D;D;D
Polyphen		0.71	P;.;.;B
Vest4		0.63
MutPred		0.57		Gain of methylation at N859 (P = 0.0159);Gain of methylation at N859 (P = 0.0159);.;Gain of methylation at N859 (P = 0.0159);
MVP		0.78
MPC		0.16
ClinPred		0.98	D
GERP RS		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.30
gMVP		0.20

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-41244971;