3-25598336-C-G

Position:

chr3-25598336-C-G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 1P and 8B. PP2BP4_StrongBS2

The NM_001330700.2(TOP2B):c.4852G>C(p.Asp1618His) variant causes a missense change. The variant allele was found at a frequency of 0.0000323 in 1,607,942 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000030 ( 0 hom. )

Consequence

TOP2B
NM_001330700.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:2

Conservation

PhyloP100: 6.38

Variant links:

Genes affected

TOP2B (HGNC:11990): (DNA topoisomerase II beta) 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, beta, is localized to chromosome 3 and the alpha form is localized to chromosome 17. 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. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2016]

TOP2B links:

TOP2B (HGNC:):

TOP2B links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TOP2B. . Gene score misZ 3.8634 (greater than the threshold 3.09). Trascript score misZ 3.6879 (greater than threshold 3.09). GenCC has associacion of gene with B-cell immunodeficiency, distal limb anomalies, and urogenital malformations.

BP4

Computational evidence support a benign effect (MetaRNN=0.046776265).

BS2

High AC in GnomAd4 at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TOP2B	NM_001330700.2 linkuse as main transcript	c.4852G>C	p.Asp1618His	missense_variant	36/36	ENST00000264331.9	NP_001317629.1	Q02880-1
TOP2B	NM_001068.3 linkuse as main transcript	c.4837G>C	p.Asp1613His	missense_variant	36/36		NP_001059.2	Q02880-2Q59H80
TOP2B	XM_011534057.4 linkuse as main transcript	c.4741G>C	p.Asp1581His	missense_variant	35/35		XP_011532359.1
TOP2B	XM_047448821.1 linkuse as main transcript	c.4726G>C	p.Asp1576His	missense_variant	35/35		XP_047304777.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TOP2B	ENST00000264331.9 linkuse as main transcript	c.4852G>C	p.Asp1618His	missense_variant	36/36	5	NM_001330700.2	ENSP00000264331.4		Q02880-1

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152176

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:

0.00154

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:

0.0000569

AC:

AN:

245880

Hom.:

AF XY:

0.0000300

AC XY:

AN XY:

133274

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000784

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:

0.0000302

AC:

AN:

1455648

Hom.:

Cov.:

AF XY:

0.0000249

AC XY:

AN XY:

723806

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00103

Gnomad4 SAS exome

AF:

0.0000235

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000525

AC:

AN:

152294

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00154

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000113

ExAC

AF:

0.0000911

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 10, 2022	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. 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: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with TOP2B-related conditions. This variant is present in population databases (rs764335718, gnomAD 0.07%). This sequence change replaces aspartic acid, which is acidic and polar, with histidine, which is basic and polar, at codon 1613 of the TOP2B protein (p.Asp1613His). -
Uncertain significance, no assertion criteria provided	literature only	OMIM	Mar 14, 2023	- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Benign

-0.35

BayesDel_noAF

Benign

-0.38

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Benign

0.22

T;.

Eigen

Benign

0.050

Eigen_PC

Benign

0.16

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.73

T;T

M_CAP

Benign

0.039

MetaRNN

Benign

0.047

T;T

MetaSVM

Benign

-0.70

MutationAssessor

Benign

0.0

N;.

PrimateAI

Uncertain

0.55

PROVEAN

Benign

-1.2

N;N

REVEL

Benign

0.13

Sift

Uncertain

0.010

D;D

Sift4G

Uncertain

0.0050

D;D

Polyphen

0.87

P;B

Vest4

0.32

MutPred

0.24

Gain of glycosylation at S1613 (P = 0.0068);.;

MVP

0.31

MPC

0.062

ClinPred

0.13

GERP RS

4.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.1

Varity_R

0.099

gMVP

0.17

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