chr8-31033445-C-A

Position:

• chr8-31033445-C-A

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_Strong BS2

The ENST00000339382.3(PURG):​c.-663G>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00726 in 154,386 control chromosomes in the GnomAD database, including 9 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0072 (9 hom., cov: 30)
  • Exomes 𝑓: 0.0081 (0 hom.)
• Consequence: PURG ENST00000339382.3 5_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.176

Genes affected

PURG (HGNC:17930): (purine rich element binding protein G) The exact function of this gene is not known, however, its encoded product is highly similar to purine-rich element binding protein A. The latter is a DNA-binding protein which binds preferentially to the single strand of the purine-rich element termed PUR, and has been implicated in the control of both DNA replication and transcription. This gene lies in close proximity to the Werner syndrome gene, but on the opposite strand, on chromosome 8p11. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BS2: High AC in GnomAd4 at 1101 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PURG	ENST00000339382.3	c.-663G>T		5_prime_UTR_variant	1/2	1
PURG	ENST00000475541.2	c.-663G>T		5_prime_UTR_variant	1/1			P1

Frequencies

GnomAD3 genomes AF: 0.00725 AC: 1101 AN: 151792 Hom.: 9 Cov.: 30

Gnomad AFR AF: 0.00162

Gnomad AMI AF: 0.00110

Gnomad AMR AF: 0.00295

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.0258

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0103

Gnomad OTH AF: 0.00432

GnomAD4 exome AF: 0.00807 AC: 20 AN: 2478 Hom.: 0 Cov.: 0 AF XY: 0.00734 AC XY: 11 AN XY: 1498

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0307

Gnomad4 NFE exome AF: 0.00652

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00725 AC: 1101 AN: 151908 Hom.: 9 Cov.: 30 AF XY: 0.00786 AC XY: 584 AN XY: 74266

Gnomad4 AFR AF: 0.00161

Gnomad4 AMR AF: 0.00295

Gnomad4 ASJ AF: 0.00144

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.0258

Gnomad4 NFE AF: 0.0103

Gnomad4 OTH AF: 0.00428

Alfa AF: 0.00343 Hom.: 2

Bravo AF: 0.00537

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Werner syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	7.7
DANN	Benign	0.54

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: rs11574155; hg19: chr8-30890961;