chr17-43093483-T-A

Position:

• chr17-43093483-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_007294.4(BRCA1):​c.2048A>T​(p.Lys683Met) 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. 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. K683E) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.78

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39597595).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4	c.2048A>T	p.Lys683Met	missense_variant	10/23	ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9	c.2048A>T	p.Lys683Met	missense_variant	10/23	1	NM_007294.4	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.040
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.65	D;.;.;.;T
Eigen	Uncertain	0.35
Eigen_PC	Benign	0.22
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.78	T;T;T;T;T
M_CAP	Uncertain	0.16	D
MetaRNN	Benign	0.40	T;T;T;T;T
MetaSVM	Uncertain	0.055	D
MutationAssessor	Pathogenic	3.0	M;M;.;.;.
MutationTaster	Benign	0.78	D;D;D;D;D;D;D;D;N;N;N;N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Pathogenic	-5.0	D;D;D;D;.
REVEL	Uncertain	0.46
Sift	Uncertain	0.0060	D;D;D;D;.
Sift4G	Uncertain	0.0070	D;D;D;D;.
Polyphen		0.43	B;.;.;P;.
Vest4		0.49
MutPred		0.37		Loss of methylation at K683 (P = 0.0047);Loss of methylation at K683 (P = 0.0047);.;Loss of methylation at K683 (P = 0.0047);.;
MVP		0.86
MPC		0.27
ClinPred		0.97	D
GERP RS		4.5
Varity_R		0.16
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: chr17-41245500;