rs56012641

Positions:

• chr17-43093883-T-A
• chr17-43093883-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The NM_007294.4(BRCA1):​c.1648A>T​(p.Asn550Tyr) 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. N550H) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0880

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-43093883-T-G is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (MetaRNN=0.41219).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.1648A>T	p.Asn550Tyr	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.1648A>T	p.Asn550Tyr	missense_variant	10/23	1	NM_007294.4	ENSP00000350283	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	0.12
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Benign	16
DANN	Benign	0.97
DEOGEN2	Uncertain	0.52	D;.;.;.;T;T;.
Eigen	Benign	-0.33
Eigen_PC	Benign	-0.51
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.82	T;T;T;T;T;T;T
M_CAP	Pathogenic	0.41	D
MetaRNN	Benign	0.41	T;T;T;T;T;T;T
MetaSVM	Uncertain	0.48	D
MutationAssessor	Pathogenic	3.0	M;M;.;.;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.25	T
PROVEAN	Pathogenic	-5.7	D;D;D;D;.;D;D
REVEL	Uncertain	0.53
Sift	Uncertain	0.018	D;D;D;D;.;D;D
Sift4G	Uncertain	0.028	D;D;D;D;.;D;.
Polyphen		0.59	P;.;.;B;.;.;.
Vest4		0.46
MutPred		0.36		Gain of catalytic residue at N550 (P = 0.0452);Gain of catalytic residue at N550 (P = 0.0452);.;Gain of catalytic residue at N550 (P = 0.0452);.;Gain of catalytic residue at N550 (P = 0.0452);.;
MVP		0.87
MPC		0.48
ClinPred		0.81	D
GERP RS		1.3
Varity_R		0.076
gMVP		0.11

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: chr17-41245900;