5-77426518-A-G

Position:

• chr5-77426518-A-G

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS2

The NM_003719.5(PDE8B):​c.2622A>G​(p.Leu874=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000622 in 1,613,166 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00077 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00061 (0 hom.)
• Consequence: PDE8B NM_003719.5 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.465

Genes affected

PDE8B (HGNC:8794): (phosphodiesterase 8B) The protein encoded by this gene is a cyclic nucleotide phosphodiesterase (PDE) that catalyzes the hydrolysis of the second messenger cAMP. The encoded protein, which does not hydrolyze cGMP, is resistant to several PDE inhibitors. Defects in this gene are a cause of autosomal dominant striatal degeneration (ADSD). Several transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Jul 2010]

WDR41 (HGNC:25601): (WD repeat domain 41) Contributes to guanyl-nucleotide exchange factor activity. Involved in regulation of autophagy. Located in cytoplasm. Part of guanyl-nucleotide exchange factor complex. Colocalizes with Atg1/ULK1 kinase complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BP6: Variant 5-77426518-A-G is Benign according to our data. Variant chr5-77426518-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 354175.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-77426518-A-G is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-0.465 with no splicing effect.
• BS2: High AC in GnomAd4 at 117 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PDE8B	NM_003719.5	c.2622A>G	p.Leu874=	synonymous_variant	22/22	ENST00000264917.10	NP_003710.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PDE8B	ENST00000264917.10	c.2622A>G	p.Leu874=	synonymous_variant	22/22	1	NM_003719.5	ENSP00000264917	P1

Frequencies

GnomAD3 genomes AF: 0.000769 AC: 117 AN: 152198 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00128

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00183

Gnomad ASJ AF: 0.000865

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000441

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000729 AC: 183 AN: 251070 Hom.: 0 AF XY: 0.000693 AC XY: 94 AN XY: 135688

Gnomad AFR exome AF: 0.00111

Gnomad AMR exome AF: 0.00200

Gnomad ASJ exome AF: 0.00209

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000502

Gnomad OTH exome AF: 0.00261

GnomAD4 exome AF: 0.000606 AC: 886 AN: 1460850 Hom.: 0 Cov.: 30 AF XY: 0.000596 AC XY: 433 AN XY: 726792

Gnomad4 AFR exome AF: 0.00173

Gnomad4 AMR exome AF: 0.00204

Gnomad4 ASJ exome AF: 0.00161

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000533

Gnomad4 OTH exome AF: 0.00134

GnomAD4 genome AF: 0.000768 AC: 117 AN: 152316 Hom.: 0 Cov.: 32 AF XY: 0.000886 AC XY: 66 AN XY: 74484

Gnomad4 AFR AF: 0.00128

Gnomad4 AMR AF: 0.00183

Gnomad4 ASJ AF: 0.000865

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.000441

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000729 Hom.: 0

Bravo AF: 0.00107

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.000763

EpiControl AF: 0.000830

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 13, 2024	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Autosomal dominant striatal neurodegeneration type 1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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	-0.79
CADD	Benign	2.4
DANN	Benign	0.70

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: rs61735409; hg19: chr5-76722343;