chr17-43106496-G-C

Variant names:

• chr17-43106496-G-C
• rs397508904
• NM_007294.4:c.172C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4 BP6

The NM_007294.4(BRCA1):​c.172C>G​(p.Pro58Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000312 in 1,604,394 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P58L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:3
• Conservation: PhyloP100: 1.97
• Publications: 34 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

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 11 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 15 benign, 79 uncertain in NM_007294.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.4040031).
• BP6: Variant 17-43106496-G-C is Benign according to our data. Variant chr17-43106496-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 54337.

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.172C>G	p.Pro58Ala	missense	Exon 4 of 23	NP_009225.1	P38398-1
	BRCA1	NM_001407581.1		c.172C>G	p.Pro58Ala	missense	Exon 4 of 24	NP_001394510.1	A0A2R8Y7V5
	BRCA1	NM_001407582.1		c.172C>G	p.Pro58Ala	missense	Exon 4 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.172C>G	p.Pro58Ala	missense	Exon 4 of 23	ENSP00000350283.3	P38398-1
	BRCA1	ENST00000471181.7	TSL:1	c.172C>G	p.Pro58Ala	missense	Exon 4 of 24	ENSP00000418960.2	P38398-7
	BRCA1	ENST00000470026.6	TSL:1	c.172C>G	p.Pro58Ala	missense	Exon 4 of 23	ENSP00000419274.2	P38398-1

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152060 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000207 AC: 3 AN: 1452216 Hom.: 0 Cov.: 28 AF XY: 0.00000138 AC XY: 1 AN XY: 722830

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33254

American (AMR) AF: 0.00 AC: 0 AN: 44678

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26044

East Asian (EAS) AF: 0.00 AC: 0 AN: 39562

South Asian (SAS) AF: 0.00 AC: 0 AN: 85616

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53366

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5556

European-Non Finnish (NFE) AF: 0.00000181 AC: 2 AN: 1104146

Other (OTH) AF: 0.0000167 AC: 1 AN: 59994

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.0245704), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152178 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74390

African (AFR) AF: 0.0000241 AC: 1 AN: 41516

American (AMR) AF: 0.00 AC: 0 AN: 15258

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10594

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68008

Other (OTH) AF: 0.00 AC: 0 AN: 2112

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.30	T
Eigen	Uncertain	0.19
Eigen_PC	Benign	0.17
FATHMM_MKL	Benign	0.40	N
LIST_S2	Uncertain	0.87	D
M_CAP	Pathogenic	0.43	D
MetaRNN	Benign	0.40	T
MetaSVM	Uncertain	0.72	D
MutationAssessor	Benign	0.85	L
PhyloP100		2.0
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-0.95	N
REVEL	Pathogenic	0.70
Sift	Benign	0.12	T
Sift4G	Uncertain	0.048	D
Polyphen		0.99	D
Vest4		0.57
MVP		0.91
MPC		0.12
ClinPred		0.49	T
GERP RS		3.0
Varity_R		0.17
gMVP		0.24
Mutation Taster		=1/99	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
Splicevardb		2.0
SpliceAI score (max)		0.030		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: rs397508904; hg19: chr17-41258513;