8-143310198-G-C

Position:

• chr8-143310198-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_052963.3(TOP1MT):​c.1573C>G​(p.Arg525Gly) 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. 13/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R525W) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TOP1MT NM_052963.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.176

Genes affected

TOP1MT (HGNC:29787): (DNA topoisomerase I mitochondrial) This gene encodes a mitochondrial DNA topoisomerase that plays a role in the modification of DNA topology. The encoded protein is a type IB topoisomerase and catalyzes the transient breaking and rejoining of DNA to relieve tension and DNA supercoiling generated in the mitochondrial genome during replication and transcription. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, May 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12347913).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TOP1MT	NM_052963.3	c.1573C>G	p.Arg525Gly	missense_variant	13/14	ENST00000329245.9	NP_443195.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TOP1MT	ENST00000329245.9	c.1573C>G	p.Arg525Gly	missense_variant	13/14	1	NM_052963.3	ENSP00000328835	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 41

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	15
DANN	Uncertain	0.97
DEOGEN2	Benign	0.25	T;.;.;.
Eigen	Benign	-0.72
Eigen_PC	Benign	-0.80
FATHMM_MKL	Benign	0.26	N
LIST_S2	Uncertain	0.96	D;.;.;D
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.12	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	2.0	M;.;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.34	T
PROVEAN	Uncertain	-3.7	D;D;D;D
REVEL	Benign	0.058
Sift	Uncertain	0.010	D;D;D;D
Sift4G	Uncertain	0.055	T;T;T;T
Polyphen		0.11	B;.;.;.
Vest4		0.18
MutPred		0.29		Loss of stability (P = 0.0149);.;.;.;
MVP		0.58
MPC		0.27
ClinPred		0.51	D
GERP RS		-3.1
Varity_R		0.28
gMVP		0.13

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

Other links and lift over

dbSNP: rs2293925; hg19: chr8-144392368;