NM_005859.5:c.487C>T

Variant names:

• chr5-140114668-C-T
• rs1554129091
• NM_005859.5:c.487C>T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_005859.5(PURA):​c.487C>T​(p.Gln163*) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PURA NM_005859.5 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 4.90

Genes affected

PURA (HGNC:9701): (purine rich element binding protein A) This gene product is a sequence-specific, single-stranded DNA-binding protein. It binds preferentially to the single strand of the purine-rich element termed PUR, which is present at origins of replication and in gene flanking regions in a variety of eukaryotes from yeasts through humans. Thus, it is implicated in the control of both DNA replication and transcription. Deletion of this gene has been associated with myelodysplastic syndrome and acute myelogenous leukemia. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 13 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-140114668-C-T is Pathogenic according to our data. Variant chr5-140114668-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 451895.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-140114668-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PURA	NM_005859.5	c.487C>T	p.Gln163*	stop_gained	Exon 1 of 1	ENST00000331327.5	NP_005850.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PURA	ENST00000331327.5	c.487C>T	p.Gln163*	stop_gained	Exon 1 of 1	6	NM_005859.5	ENSP00000332706.3
PURA	ENST00000651386.1	c.487C>T	p.Gln163*	stop_gained	Exon 2 of 2			ENSP00000499133.1
PURA	ENST00000505703.2	c.*168C>T		downstream_gene_variant		3		ENSP00000498560.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

PURA-related severe neonatal hypotonia-seizures-encephalopathy syndrome Pathogenic:2

-

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. The variant is predicted to result in a loss or disruption of normal protein function through protein truncation. Multiple pathogenic variants are reported in the predicted truncated region. The variant has been previously reported as de novo in a similarly affected individual (PMID: 35118825). The variant has been reported at least twice as pathogenic without evidence for the classification (ClinVar ID: VCV000451895 / PMID: 33726816). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Nov 15, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the PURA protein in which other variant(s) (p.Tyr261*, p.Gln186*) have been determined to be pathogenic (PMID: 25439098). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. ClinVar contains an entry for this variant (Variation ID: 451895). This variant has not been reported in the literature in individuals affected with PURA-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Gln163*) in the PURA gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 160 amino acid(s) of the PURA protein. -

not provided Pathogenic:1

Sep 15, 2017

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Q163X variant in the PURA gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. This variant is predicted to cause a premature stop codon, resulting in protein truncation of the last 160 amnio acids. The Q163X variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). We interpret Q163X as a pathogenic variant -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.65
CADD	Pathogenic	44
DANN	Uncertain	1.0
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Uncertain	0.94	D
Vest4		0.85
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs1554129091; hg19: chr5-139494253;