rs1421233354

Positions:

• chr8-42843034-A-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_018105.3(THAP1):​c.61T>G​(p.Ser21Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 152,090 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S21C) has been classified as Likely pathogenic.

• Frequency: Genomes: 𝑓 0.000013 (0 hom., cov: 32)
• Consequence: THAP1 NM_018105.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 7.74

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]

(HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a zinc_finger_region THAP-type (size 80) in uniprot entity THAP1_HUMAN there are 36 pathogenic changes around while only 1 benign (97%) in NM_018105.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.898

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
THAP1	NM_018105.3	c.61T>G	p.Ser21Ala	missense_variant	1/3	ENST00000254250.7	NP_060575.1
LOC124901940	XR_007060901.1	n.101A>C		non_coding_transcript_exon_variant	1/2
THAP1	NM_199003.2	c.61T>G	p.Ser21Ala	missense_variant	1/2		NP_945354.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
THAP1	ENST00000254250.7	c.61T>G	p.Ser21Ala	missense_variant	1/3	1	NM_018105.3	ENSP00000254250	P1
THAP1	ENST00000345117.2	c.61T>G	p.Ser21Ala	missense_variant	1/2	1		ENSP00000344966
	ENST00000669010.1	n.46A>C		non_coding_transcript_exon_variant	1/2
THAP1	ENST00000529779.1	c.61T>G	p.Ser21Ala	missense_variant	1/3	5		ENSP00000433912

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 152090 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

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

GnomAD4 exome Cov.: 31

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 152090 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74316

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Mar 21, 2017

- -

Torsion dystonia 6 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 29, 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. This variant disrupts the p.Ser21 amino acid residue in THAP1. Other variant(s) that disrupt this residue have been observed in individuals with THAP1-related conditions (PMID: 19345147, 22377579, 24976531, 26610312), which suggests that this may be a clinically significant amino acid residue. 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: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 448687). 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 replaces serine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 21 of the THAP1 protein (p.Ser21Ala). -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 06, 2022

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	29
DANN	Benign	0.94
DEOGEN2	Uncertain	0.65	D;.;.
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.73	T;T;T
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.90	D;D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Uncertain	2.8	M;M;.
MutationTaster	Benign	1.0	D;N
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-1.7	N;D;N
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0060	D;D;D
Sift4G	Uncertain	0.029	D;D;D
Polyphen		0.99	D;.;D
Vest4		0.62
MutPred		0.75		Loss of disorder (P = 0.0502);Loss of disorder (P = 0.0502);Loss of disorder (P = 0.0502);
MVP		0.90
MPC		0.87
ClinPred		0.97	D
GERP RS		5.2
Varity_R		0.90
gMVP		0.56

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: rs1421233354; hg19: chr8-42698177;