Genetic Variant CBFA2T2:p.Ala2Val (chr20-33574205-C-T) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_005093.4(CBFA2T2):c.5C>T(p.Ala2Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000011 in 1,461,038 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

CBFA2T2
NM_005093.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.02

Variant links:

Genes affected

CBFA2T2 (HGNC:1536): (CBFA2/RUNX1 partner transcriptional co-repressor 2) In acute myeloid leukemia, especially in the M2 subtype, the t(8;21)(q22;q22) translocation is one of the most frequent karyotypic abnormalities. The translocation produces a chimeric gene made up of the 5'-region of the RUNX1 (AML1) gene fused to the 3'-region of the CBFA2T1 (MTG8) gene. The chimeric protein is thought to associate with the nuclear corepressor/histone deacetylase complex to block hematopoietic differentiation. The protein encoded by this gene binds to the AML1-MTG8 complex and may be important in promoting leukemogenesis. Several transcript variants are thought to exist for this gene, but the full-length natures of only three have been described. [provided by RefSeq, Jul 2008]

CBFA2T2 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.071854055).

BS2

High AC in GnomAdExome4 at 16 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CBFA2T2	NM_001032999.3 link	c.35-32751C>T		intron_variant	Intron 1 of 10	ENST00000342704.11	NP_001028171.1	O43439-5
CBFA2T2	NM_005093.4 link	c.5C>T	p.Ala2Val	missense_variant	Exon 2 of 12		NP_005084.1	O43439-1
CBFA2T2	NM_001039709.2 link	c.-27+11531C>T		intron_variant	Intron 1 of 10		NP_001034798.1	O43439-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CBFA2T2	ENST00000342704.11 link	c.35-32751C>T		intron_variant	Intron 1 of 10	1	NM_001032999.3	ENSP00000345810.6		O43439-5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000318

AC:

AN:

251440

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135894

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000435

Gnomad SAS 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:

0.0000110

AC:

AN:

1461038

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

726836

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000302

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000332

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 02, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.5C>T (p.A2V) alteration is located in exon 2 (coding exon 1) of the CBFA2T2 gene. This alteration results from a C to T substitution at nucleotide position 5, causing the alanine (A) at amino acid position 2 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.56

CADD

Benign

6.6

DANN

Benign

0.96

DEOGEN2

Benign

0.18

T;T

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.18

LIST_S2

Benign

0.31

.;T

M_CAP

Benign

0.0027

MetaRNN

Benign

0.072

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.0

N;N

PROVEAN

Benign

0.090

N;N

REVEL

Benign

0.099

Sift

Uncertain

0.028

D;D

Polyphen

0.0030

B;B

Vest4

0.14

MutPred

0.13

Gain of methylation at K3 (P = 0.034);Gain of methylation at K3 (P = 0.034);

MVP

0.66

MPC

0.67

ClinPred

0.043

GERP RS

1.6

Varity_R

0.050

gMVP

0.15

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