2-31334403-C-A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_000379.4(XDH):c.*1555G>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.279 in 152,044 control chromosomes in the GnomAD database, including 6,292 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.28 (6292 hom., cov: 32)
  • Failed GnomAD Quality Control
• Consequence: XDH NM_000379.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.525

Genes affected

XDH (HGNC:12805): (xanthine dehydrogenase) Xanthine dehydrogenase belongs to the group of molybdenum-containing hydroxylases involved in the oxidative metabolism of purines. The encoded protein has been identified as a moonlighting protein based on its ability to perform mechanistically distinct functions. Xanthine dehydrogenase can be converted to xanthine oxidase by reversible sulfhydryl oxidation or by irreversible proteolytic modification. Defects in xanthine dehydrogenase cause xanthinuria, may contribute to adult respiratory stress syndrome, and may potentiate influenza infection through an oxygen metabolite-dependent mechanism. [provided by RefSeq, Jan 2014]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BP6: Variant 2-31334403-C-A is Benign according to our data. Variant chr2-31334403-C-A is described in ClinVar as [Benign]. Clinvar id is 335733.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.381 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XDH	NM_000379.4	c.*1555G>T		3_prime_UTR_variant	36/36	ENST00000379416.4
XDH	XM_011533095.3	c.*1555G>T		3_prime_UTR_variant	36/36

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
XDH	ENST00000379416.4	c.*1555G>T		3_prime_UTR_variant	36/36	1	NM_000379.4	P1

Frequencies

GnomAD3 genomes AF: 0.279 AC: 42389 AN: 151926 Hom.: 6294 Cov.: 32

Gnomad AFR AF: 0.387

Gnomad AMI AF: 0.282

Gnomad AMR AF: 0.209

Gnomad ASJ AF: 0.242

Gnomad EAS AF: 0.151

Gnomad SAS AF: 0.322

Gnomad FIN AF: 0.174

Gnomad MID AF: 0.354

Gnomad NFE AF: 0.254

Gnomad OTH AF: 0.281

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.279 AC: 42404 AN: 152044 Hom.: 6292 Cov.: 32 AF XY: 0.273 AC XY: 20256 AN XY: 74320

Gnomad4 AFR AF: 0.386

Gnomad4 AMR AF: 0.209

Gnomad4 ASJ AF: 0.242

Gnomad4 EAS AF: 0.151

Gnomad4 SAS AF: 0.321

Gnomad4 FIN AF: 0.174

Gnomad4 NFE AF: 0.254

Gnomad4 OTH AF: 0.279

Alfa AF: 0.244 Hom.: 4556

Bravo AF: 0.285

Asia WGS AF: 0.257 AC: 895 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary xanthinuria type 1 Benign:1

Benign, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
Cadd	Benign	0.62
Dann	Benign	0.45

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: rs6752058; hg19: chr2-31557269;