NM_001067.4:c.4495C>G

Variant names:

• chr17-40389620-G-C
• rs111733098
• NM_001067.4:c.4495C>G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001067.4(TOP2A):​c.4495C>G​(p.His1499Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TOP2A NM_001067.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.555

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]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.039700627).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TOP2A	NM_001067.4	c.4495C>G	p.His1499Asp	missense_variant	Exon 35 of 35	ENST00000423485.6	NP_001058.2
TOP2A	XM_005257632.2	c.4459C>G	p.His1487Asp	missense_variant	Exon 35 of 35		XP_005257689.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TOP2A	ENST00000423485.6	c.4495C>G	p.His1499Asp	missense_variant	Exon 35 of 35	1	NM_001067.4	ENSP00000411532.1
TOP2A	ENST00000578412.1	n.824C>G		non_coding_transcript_exon_variant	Exon 3 of 3	2
TOP2A	ENST00000577541.1	c.-18C>G		upstream_gene_variant		2		ENSP00000464055.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.062
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	16
DANN	Benign	0.96
DEOGEN2	Benign	0.025	T
Eigen	Benign	-0.33
Eigen_PC	Benign	-0.19
FATHMM_MKL	Benign	0.44	N
LIST_S2	Benign	0.60	T
M_CAP	Benign	0.0042	T
MetaRNN	Benign	0.040	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	L
PrimateAI	Benign	0.32	T
PROVEAN	Benign	0.94	N
REVEL	Benign	0.093
Sift	Benign	0.59	T
Sift4G	Benign	0.73	T
Polyphen		0.014	B
Vest4		0.26
MutPred		0.36		Loss of catalytic residue at H1499 (P = 0.1039);
MVP		0.28
MPC		0.19
ClinPred		0.11	T
GERP RS		5.3
Varity_R		0.027
gMVP		0.074

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs111733098; hg19: chr17-38545872;