chr8-42839321-GT-G

Position:

• chr8-42839321-GT-G

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_018105.3(THAP1):​c.131del​(p.Asn44ThrfsTer29) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: THAP1 NM_018105.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.21

Genes affected

THAP1 (HGNC:20856): (THAP domain containing 1) The protein encoded by this gene contains a THAP domain, a conserved DNA-binding domain. This protein colocalizes with the apoptosis response protein PAWR/PAR-4 in promyelocytic leukemia (PML) nuclear bodies, and functions as a proapoptotic factor that links PAWR to PML nuclear bodies. Alternatively spliced transcript variants encoding distinct isoforms have been observed. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 27 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-42839321-GT-G is Pathogenic according to our data. Variant chr8-42839321-GT-G is described in ClinVar as [Pathogenic]. Clinvar id is 532261.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
THAP1	NM_018105.3	c.131del	p.Asn44ThrfsTer29	frameshift_variant	2/3	ENST00000254250.7	NP_060575.1
THAP1	NM_199003.2	c.72-986del		intron_variant			NP_945354.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
THAP1	ENST00000254250.7	c.131del	p.Asn44ThrfsTer29	frameshift_variant	2/3	1	NM_018105.3	ENSP00000254250	P1
THAP1	ENST00000345117.2	c.72-986del		intron_variant		1		ENSP00000344966
THAP1	ENST00000529779.1	c.131del	p.Asn44ThrfsTer29	frameshift_variant	2/3	5		ENSP00000433912
THAP1	ENST00000532093.1	n.361del		non_coding_transcript_exon_variant	2/2	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Torsion dystonia 6 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 04, 2023

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 532261). This variant has not been reported in the literature in individuals affected with THAP1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Asn44Thrfs*29) in the THAP1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in THAP1 are known to be pathogenic (PMID: 19345147). -

Computational scores

Source: dbNSFP v4.3

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: rs1554599712; hg19: chr8-42694464;