NM_001067.4:c.3991G>T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_001067.4(TOP2A):c.3991G>T(p.Asp1331Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000532 in 1,597,496 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000055 ( 0 hom. )

Consequence

TOP2A
NM_001067.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.76

Variant links:

Genes affected

TOP2A (HGNC:11989): (DNA topoisomerase II alpha) This gene encodes a DNA topoisomerase, an enzyme that controls and alters the topologic states of DNA during transcription. This nuclear enzyme is involved in processes such as chromosome condensation, chromatid separation, and the relief of torsional stress that occurs during DNA transcription and replication. It catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA. Two forms of this enzyme exist as likely products of a gene duplication event. The gene encoding this form, alpha, is localized to chromosome 17 and the beta gene is localized to chromosome 3. The gene encoding this enzyme functions as the target for several anticancer agents and a variety of mutations in this gene have been associated with the development of drug resistance. Reduced activity of this enzyme may also play a role in ataxia-telangiectasia. [provided by RefSeq, Jul 2010]

TOP2A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High AC in GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TOP2A	NM_001067.4 link	c.3991G>T	p.Asp1331Tyr	missense_variant	Exon 31 of 35	ENST00000423485.6	NP_001058.2	P11388-1
TOP2A	XM_005257632.2 link	c.3955G>T	p.Asp1319Tyr	missense_variant	Exon 31 of 35		XP_005257689.1
TOP2A	XM_011525165.3 link	c.3991G>T	p.Asp1331Tyr	missense_variant	Exon 31 of 32		XP_011523467.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TOP2A	ENST00000423485.6 link	c.3991G>T	p.Asp1331Tyr	missense_variant	Exon 31 of 35	1	NM_001067.4	ENSP00000411532.1		P11388-1
TOP2A	ENST00000578412.1 link	n.-214G>T		upstream_gene_variant		2

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152090

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

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:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000228

AC:

AN:

219334

Hom.:

AF XY:

0.0000169

AC XY:

AN XY:

118518

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000490

Gnomad NFE exome

AF:

0.0000208

Gnomad OTH exome

AF:

0.000360

GnomAD4 exome

AF:

0.0000553

AC:

AN:

1445406

Hom.:

Cov.:

AF XY:

0.0000543

AC XY:

AN XY:

717636

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000241

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000380

Gnomad4 NFE exome

AF:

0.0000662

Gnomad4 OTH exome

AF:

0.0000669

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152090

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74272

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000166

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 30, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3991G>T (p.D1331Y) alteration is located in exon 31 (coding exon 31) of the TOP2A gene. This alteration results from a G to T substitution at nucleotide position 3991, causing the aspartic acid (D) at amino acid position 1331 to be replaced by a tyrosine (Y). 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

0.16

BayesDel_addAF

Uncertain

0.022

BayesDel_noAF

Benign

-0.18

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Benign

0.35

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.82

M_CAP

Benign

0.016

MetaRNN

Uncertain

0.55

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.5

PrimateAI

Uncertain

0.56

PROVEAN

Uncertain

-3.2

REVEL

Benign

0.14

Sift

Uncertain

0.010

Sift4G

Uncertain

0.0080

Polyphen

1.0

Vest4

0.61

MutPred

0.21

Gain of phosphorylation at D1331 (P = 0.0037);

MVP

0.25

MPC

0.59

ClinPred

0.96

GERP RS

5.0

Varity_R

0.26

gMVP

0.36

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.31

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.31

Position offset: -7

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