17-43115738-T-C

Variant names:

• chr17-43115738-T-C
• rs80357276
• NM_007294.4:c.122A>G

Variant summary

Our verdict is Pathogenic. The variant received 22 ACMG points: 22P and 0B. PS3 PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_007294.4(BRCA1):​c.122A>G​(p.His41Arg) 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. Variant has been reported in ClinVar as Pathogenic (★★★). ClinVar reports functional evidence for this variant: "SCV000075396: Experimental studies have shown that this missense change affects BRCA1 function (PMID:16403807, 20103620, 21725363, 22843421, 23161852, 25823446, 30209399)." and additional evidence is available in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H41Q) has been classified as Uncertain significance. The gene BRCA1 is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:9 U:1
• Conservation: PhyloP100: 3.52
• Publications: 38 publications found

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 Gene-Disease associations (from GenCC):

• BRCA1-related cancer predisposition

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• breast-ovarian cancer, familial, susceptibility to, 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
• Fanconi anemia, complementation group S

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
• pancreatic cancer, susceptibility to, 4

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary breast ovarian cancer syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Specifications for BRCA1 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Pathogenic. The variant received 22 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV000075396: Experimental studies have shown that this missense change affects BRCA1 function (PMID: 16403807, 20103620, 21725363, 22843421, 23161852, 25823446, 30209399).; SCV000916704: Functional studies reported that this variant showed abrogated function in the homology directed repair assay, abrogated ubiquitin ligase and weak BARD1 binding activity (Morris_2006, Towler_2013, Ransburgh_2010).; SCV000568437: BRCA1 His41Arg has been associated with weakened BARD1 binding, centrosome amplification, and inhibition of ubiquitin ligase, single strand annealing (SSA), and homology directed recombination (HDR) activities (Morris 2006, Ransburgh 2010, Kais 2012, Towler 2013).; SCV000660995: Several independent functional assays demonstrate that although this alteration may not disrupt binding of BRCA1 to BARD1, it significantly impacts its ubiquitin ligase activity, homology directed recombination activity, single strand annealing abilities and significantly increased centrosome amplification (Morris JR et al. Hum. Mol. Genet. 2006 Feb; 15(4):599-606; Ransburgh DJ et al. Cancer Res. 2010 Feb; 70(3):988-95; Towler WI et al. Hum. Mutat. 2013 Mar; 34(3):439-45; Caleca L et al. Cancers (Basel), 2019 Jan;11; Starita LM et al. Genetics, 2015 Jun;200:413-22; Starita LM et al. Am. J. Hum. Genet., 2018 Oct;103:498-508).
• PM1: In a hotspot region, there are 28 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 14 benign, 70 uncertain in NM_007294.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-43115739-G-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 409353.Status of the report is reviewed_by_expert_panel, 3 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99
• PP5: Variant 17-43115738-T-C is Pathogenic according to our data. Variant chr17-43115738-T-C is described in ClinVar as Pathogenic. ClinVar VariationId is 54166.Status of the report is reviewed_by_expert_panel, 3 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007294.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BRCA1	NM_007294.4	MANE Select	c.122A>G	p.His41Arg	missense	Exon 3 of 23	NP_009225.1	P38398-1
	BRCA1	NM_001407581.1		c.122A>G	p.His41Arg	missense	Exon 3 of 24	NP_001394510.1	A0A2R8Y7V5
	BRCA1	NM_001407582.1		c.122A>G	p.His41Arg	missense	Exon 3 of 24	NP_001394511.1	A0A2R8Y7V5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BRCA1	ENST00000357654.9	TSL:1 MANE Select	c.122A>G	p.His41Arg	missense	Exon 3 of 23	ENSP00000350283.3	P38398-1
	BRCA1	ENST00000471181.7	TSL:1	c.122A>G	p.His41Arg	missense	Exon 3 of 24	ENSP00000418960.2	P38398-7
	BRCA1	ENST00000470026.6	TSL:1	c.122A>G	p.His41Arg	missense	Exon 3 of 23	ENSP00000419274.2	P38398-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
3	1	-	Breast-ovarian cancer, familial, susceptibility to, 1 (4)
3	-	-	not provided (3)
2	-	-	Hereditary breast ovarian cancer syndrome (2)
1	-	-	Hereditary cancer-predisposing syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.57
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.46	T
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.89	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Pathogenic	4.0	H
PhyloP100		3.5
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-1.3	N
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.053	T
Polyphen		0.96	D
Vest4		0.87
MutPred		0.97		Gain of MoRF binding (P = 0.0172)
MVP		1.0
MPC		0.48
ClinPred		1.0	D
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.95
gMVP		0.94
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
Splicevardb		2.0
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs80357276; hg19: chr17-41267755;