6-24653086-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BS1_Supporting

The NM_016614.3(TDP2):c.704C>T(p.Ala235Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000322 in 1,613,838 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000039 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000031 (0 hom.)
• Consequence: TDP2 NM_016614.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.196

Genes affected

TDP2 (HGNC:17768): (tyrosyl-DNA phosphodiesterase 2) This gene encodes a member of a superfamily of divalent cation-dependent phosphodiesterases. The encoded protein associates with CD40, tumor necrosis factor (TNF) receptor-75 and TNF receptor associated factors (TRAFs), and inhibits nuclear factor-kappa-B activation. This protein has sequence and structural similarities with APE1 endonuclease, which is involved in both DNA repair and the activation of transcription factors. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.025289476).
• BS1: Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.0000315 (46/1461834) while in subpopulation EAS AF= 0.000529 (21/39694). AF 95% confidence interval is 0.000354. There are 0 homozygotes in gnomad4_exome. There are 18 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TDP2	NM_016614.3	c.704C>T	p.Ala235Val	missense_variant	6/7	ENST00000378198.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TDP2	ENST00000378198.9	c.704C>T	p.Ala235Val	missense_variant	6/7	1	NM_016614.3	P1
TDP2	ENST00000341060.3	c.530C>T	p.Ala177Val	missense_variant	5/6	1
TDP2	ENST00000478507.1	n.387C>T		non_coding_transcript_exon_variant	3/4	5

Frequencies

GnomAD3 genomes AF: 0.0000395 AC: 6 AN: 152004 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000578

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000111 AC: 28 AN: 251394 Hom.: 0 AF XY: 0.000103 AC XY: 14 AN XY: 135872

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000979

Gnomad SAS exome AF: 0.000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000315 AC: 46 AN: 1461834 Hom.: 0 Cov.: 32 AF XY: 0.0000248 AC XY: 18 AN XY: 727224

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000529

Gnomad4 SAS exome AF: 0.000220

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.0000662

GnomAD4 genome AF: 0.0000395 AC: 6 AN: 152004 Hom.: 0 Cov.: 32 AF XY: 0.0000539 AC XY: 4 AN XY: 74224

Gnomad4 AFR AF: 0.0000242

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000578

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000264

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.000132 AC: 16

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 23, 2023

The c.704C>T (p.A235V) alteration is located in exon 6 (coding exon 6) of the TDP2 gene. This alteration results from a C to T substitution at nucleotide position 704, causing the alanine (A) at amino acid position 235 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	0.089
BayesDel_addAF	Benign	-0.50	T
BayesDel_noAF	Benign	-0.55
Cadd	Benign	14
Dann	Benign	0.88
DEOGEN2	Benign	0.21	T;T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.10	N
LIST_S2	Benign	0.14	T;T
M_CAP	Benign	0.062	D
MetaRNN	Benign	0.025	T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.1	L;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-1.5	N;N
REVEL	Benign	0.22
Sift	Benign	0.19	T;T
Sift4G	Benign	0.26	T;T
Polyphen		0.34	B;.
Vest4		0.050
MVP		0.19
MPC		0.16
ClinPred		0.030	T
GERP RS		-8.1
Varity_R		0.12
gMVP		0.31

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: rs375948102; hg19: chr6-24653314; COSMIC: COSV100593844; COSMIC: COSV100593844;