Genetic Variant PDE8B:p.Ala4Val (chr5-77210936-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_003719.5(PDE8B):c.11C>T(p.Ala4Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000469 in 1,491,778 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000037 ( 0 hom. )

Consequence

PDE8B
NM_003719.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.39

Variant links:

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]

PDE8B links:

ENSG00000284762 (HGNC:):

ENSG00000284762 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PDE8B	NM_003719.5 link	c.11C>T	p.Ala4Val	missense_variant	Exon 1 of 22	ENST00000264917.10	NP_003710.1	O95263-1B3KN77

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PDE8B	ENST00000264917.10 link	c.11C>T	p.Ala4Val	missense_variant	Exon 1 of 22	1	NM_003719.5	ENSP00000264917.6		O95263-1
ENSG00000284762	ENST00000646262.1 link	c.-34+92415C>T		intron_variant	Intron 3 of 23			ENSP00000493971.1		A0A2R8Y4E6

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151112

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.00318

Gnomad NFE

AF:

0.0000148

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000373

AC:

AN:

1340558

Hom.:

Cov.:

AF XY:

0.00000301

AC XY:

AN XY:

664644

show subpopulations

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:

0.00

Gnomad4 NFE exome

AF:

0.00000472

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151220

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73890

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000148

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Feb 28, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.11C>T (p.A4V) alteration is located in exon 1 (coding exon 1) of the PDE8B gene. This alteration results from a C to T substitution at nucleotide position 11, causing the alanine (A) at amino acid position 4 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.87

BayesDel_addAF

Uncertain

0.023

BayesDel_noAF

Benign

-0.20

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.072

.;.;T;.;.

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.097

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.91

D;D;D;D;D

M_CAP

Pathogenic

0.97

MetaRNN

Uncertain

0.53

D;D;D;D;D

MetaSVM

Benign

-0.57

MutationAssessor

Benign

0.81

L;L;L;L;L

PrimateAI

Pathogenic

0.91

PROVEAN

Benign

-1.2

N;N;N;N;N

REVEL

Uncertain

0.39

Sift

Benign

0.059

T;T;T;D;T

Sift4G

Benign

0.075

T;T;T;T;T

Polyphen

0.51

P;B;P;P;P

Vest4

0.28

MutPred

0.68

Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);

MVP

0.71

MPC

1.4

ClinPred

0.66

GERP RS

2.6

Varity_R

0.13

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over