Genetic Variant BRAT1:p.Thr331Lys (chr7-2542143-G-T) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_152743.4(BRAT1):c.992C>A(p.Thr331Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000707 in 1,413,508 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. T331M) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

BRAT1
NM_152743.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.33

Publications

0 publications found

Variant links:

Genes affected

BRAT1 (HGNC:21701): (BRCA1 associated ATM activator 1) The protein encoded by this ubiquitously expressed gene interacts with the tumor suppressing BRCA1 (breast cancer 1) protein and and the ATM (ataxia telangiectasia mutated) protein. ATM is thought to be a master controller of cell cycle checkpoint signalling pathways that are required for cellular responses to DNA damage such as double-strand breaks that are induced by ionizing radiation and complexes with BRCA1 in the multi-protein complex BASC (BRAC1-associated genome surveillance complex). The protein encoded by this gene is thought to play a role in the DNA damage pathway regulated by BRCA1 and ATM. [provided by RefSeq, Mar 2012]

BRAT1 Gene-Disease associations (from GenCC):

neonatal-onset encephalopathy with rigidity and seizures
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, ClinGen, G2P, Labcorp Genetics (formerly Invitae)
neurodevelopmental disorder with cerebellar atrophy and with or without seizures
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics

BRAT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2774678).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRAT1	NM_152743.4 link	c.992C>A	p.Thr331Lys	missense_variant	Exon 7 of 14	ENST00000340611.9	NP_689956.2	Q6PJG6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRAT1	ENST00000340611.9 link	c.992C>A	p.Thr331Lys	missense_variant	Exon 7 of 14	1	NM_152743.4	ENSP00000339637.4		Q6PJG6-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.07e-7

AC:

AN:

1413508

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

699166

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

32278

American (AMR)

AF:

0.00

AC:

AN:

37398

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24876

East Asian (EAS)

AF:

0.00

AC:

AN:

37438

South Asian (SAS)

AF:

0.00

AC:

AN:

80120

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49492

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5640

European-Non Finnish (NFE)

AF:

9.19e-7

AC:

AN:

1087808

Other (OTH)

AF:

0.00

AC:

AN:

58458

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.31

BayesDel_addAF

Uncertain

0.088

BayesDel_noAF

Benign

-0.11

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.0075

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.22

FATHMM_MKL

Benign

0.52

LIST_S2

Benign

0.73

M_CAP

Uncertain

0.18

MetaRNN

Benign

0.28

MetaSVM

Uncertain

0.0039

MutationAssessor

Uncertain

2.0

PhyloP100

2.3

PrimateAI

Benign

0.42

PROVEAN

Benign

-1.8

REVEL

Uncertain

0.32

Sift

Uncertain

0.0080

Sift4G

Uncertain

0.040

Polyphen

0.80

Vest4

0.36

MutPred

0.40

Gain of ubiquitination at T331 (P = 0.0238);

MVP

0.82

MPC

0.12

ClinPred

0.43

GERP RS

4.5

Varity_R

0.19

gMVP

0.39

Mutation Taster

=93/7

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.12

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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7-2542143-G-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over