chr19-48796646-G-C

Position:

chr19-48796646-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_001190.4(BCAT2):c.997C>G(p.Arg333Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000112 in 1,613,518 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R333Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

BCAT2
NM_001190.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 2.71

Variant links:

Genes affected

BCAT2 (HGNC:977): (branched chain amino acid transaminase 2) This gene encodes a branched chain aminotransferase found in mitochondria. The encoded protein forms a dimer that catalyzes the first step in the production of the branched chain amino acids leucine, isoleucine, and valine. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2009]

BCAT2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.30052933).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
BCAT2	NM_001190.4 linkuse as main transcript	c.997C>G	p.Arg333Gly	missense_variant	9/11	ENST00000316273.11
BCAT2	NM_001284325.2 linkuse as main transcript	c.877C>G	p.Arg293Gly	missense_variant	10/12
BCAT2	NM_001164773.2 linkuse as main transcript	c.721C>G	p.Arg241Gly	missense_variant	7/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BCAT2	ENST00000316273.11 linkuse as main transcript	c.997C>G	p.Arg333Gly	missense_variant	9/11	1	NM_001190.4	P1	O15382-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152042

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000580

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000399

AC:

AN:

250360

Hom.:

AF XY:

0.0000443

AC XY:

AN XY:

135548

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000272

Gnomad SAS exome

AF:

0.000163

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1461354

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

727042

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.0000928

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152164

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74394

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000582

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.0000412

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 30, 2024

The c.997C>G (p.R333G) alteration is located in exon 9 (coding exon 9) of the BCAT2 gene. This alteration results from a C to G substitution at nucleotide position 997, causing the arginine (R) at amino acid position 333 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 17, 2022

This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 333 of the BCAT2 protein (p.Arg333Gly). This variant is present in population databases (rs149621078, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with BCAT2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.35

BayesDel_noAF

Benign

-0.44

CADD

Uncertain

DANN

Uncertain

0.99

Eigen

Benign

0.034

Eigen_PC

Benign

-0.029

FATHMM_MKL

Benign

0.47

LIST_S2

Pathogenic

0.98

D;.;D;D;D;D;D

M_CAP

Benign

0.0097

MetaRNN

Benign

0.30

T;T;T;T;T;T;T

MetaSVM

Benign

-1.1

MutationTaster

Benign

0.99

N;N;N

PrimateAI

Benign

0.40

PROVEAN

Uncertain

-3.6

D;D;D;.;.;.;.

REVEL

Benign

0.10

Sift

Benign

0.071

T;T;T;.;.;.;.

Sift4G

Benign

0.21

T;T;T;T;T;T;T

Polyphen

0.77

P;D;D;.;D;.;.

Vest4

0.62

MutPred

0.37

.;.;Loss of MoRF binding (P = 0.0886);.;.;.;Loss of MoRF binding (P = 0.0886);

MVP

0.54

MPC

1.1

ClinPred

0.73

GERP RS

3.3

Varity_R

0.67

gMVP

0.70

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over