17-43091807-T-C

Variant names:

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_ModerateBP6_Very_Strong

The NM_007294.4(BRCA1):c.3724A>G(p.Thr1242Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,461,876 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 Benign (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T1242S) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

BRCA1
NM_007294.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:4B:4

Conservation

PhyloP100: -0.0160

Publications

12 publications found

Variant links:

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):

breast-ovarian cancer, familial, susceptibility to, 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
Fanconi anemia, complementation group S
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen, 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

BRCA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -10 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.17748773).

BP6

Variant 17-43091807-T-C is Benign according to our data. Variant chr17-43091807-T-C is described in ClinVar as Benign. ClinVar VariationId is 54982.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA1	NM_007294.4 link	c.3724A>G	p.Thr1242Ala	missense_variant	Exon 10 of 23	ENST00000357654.9	NP_009225.1	P38398-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9 link	c.3724A>G	p.Thr1242Ala	missense_variant	Exon 10 of 23	1	NM_007294.4	ENSP00000350283.3		P38398-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251272

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000821

AC:

AN:

1461876

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727238

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000899

AC:

AN:

1112004

Other (OTH)

AF:

0.0000166

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000371

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Benign

Submissions summary: Uncertain:4Benign:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:2Benign:1

Jul 14, 2016

Color Diagnostics, LLC DBA Color Health

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 23, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.T1242A variant (also known as c.3724A>G), located in coding exon 9 of the BRCA1 gene, results from an A to G substitution at nucleotide position 3724. The threonine at codon 1242 is replaced by alanine, an amino acid with similar properties. This alteration has been detected in 1/2575 unselected patients with breast cancer and 0/2809 healthy control individuals from a Malaysian cohort (Wen WX et al. J. Med. Genet. 2018 02;55:97-103). This alteration was classified as benign in a multifactorial model of variant interpretation that incorporates co-segregation, family history, co-occurrence, tumor pathology, and case-control data (Parsons MT. et al. Hum Mutat. 2019 09;40(9):1557-1578). This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

Dec 05, 2021

Sema4, Sema4

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:curation

- -

Breast-ovarian cancer, familial, susceptibility to, 1

Uncertain:1Benign:1

Nov 25, 2004

Breast Cancer Information Core (BIC) (BRCA1)

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jun 18, 2019

Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)

Significance:Benign

Review Status:reviewed by expert panel

Collection Method:curation

IARC class based on posterior probability from multifactorial likelihood analysis, thresholds for class as per Plon et al. 2008 (PMID: 18951446). Class 1 based on posterior probability = 0.000025 -

not specified

Uncertain:1

Jun 17, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: BRCA1 c.3724A>G (p.Thr1242Ala) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 7.4e-06 in 1614204 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in BRCA1 causing Hereditary Breast and Ovarian Cancer Syndrome (7.4e-06 vs 0.001), allowing no conclusion about variant significance. c.3724A>G has been reported in the literature in at least an individual affected with breast cancer without any strong evidence for causality (example: Xiong Wen_2018). These report(s) do not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer Syndrome. A multifactorial likelihood analysis and a functional study have classified the variant as benign (example: Lyra_2020, Parson_2019). The following publications have been ascertained in the context of this evaluation (PMID: 31294896, 16267036, 33087888, 31112341, 23704879, 28993434, 31131967). ClinVar contains an entry for this variant (Variation ID: 54982). Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

not provided

Benign:1

Dec 02, 2019

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 28993434, 16267036, 31131967) -

Hereditary breast ovarian cancer syndrome

Benign:1

Dec 09, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.080

BayesDel_addAF

Benign

-0.010

BayesDel_noAF

Uncertain

-0.070

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.24

T;.;.;.

Eigen

Benign

-0.88

Eigen_PC

Benign

-0.95

FATHMM_MKL

Benign

0.088

LIST_S2

Benign

0.80

T;T;T;T

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.18

T;T;T;T

MetaSVM

Benign

-0.75

MutationAssessor

Uncertain

2.7

M;M;.;.

PhyloP100

-0.016

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.89

N;N;N;N

REVEL

Uncertain

0.39

Sift

Uncertain

0.0010

D;D;D;D

Sift4G

Benign

0.20

T;T;T;D

Polyphen

0.15

B;.;.;B

Vest4

0.38

MVP

0.44

MPC

0.30

ClinPred

0.49

GERP RS

1.7

PromoterAI

0.017

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.038

gMVP

0.12

Mutation Taster

=55/45

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over