5-77211032-C-G

Position:

• chr5-77211032-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_003719.5(PDE8B):​c.107C>G​(p.Pro36Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000144 in 1,390,292 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PDE8B NM_003719.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.83

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]

ENSG00000284762 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PDE8B. . Gene score misZ 2.9973 (greater than the threshold 3.09). Trascript score misZ 3.3776 (greater than threshold 3.09). GenCC has associacion of gene with pigmented nodular adrenocortical disease, primary, 3, autosomal dominant striatal neurodegeneration type 1, primary pigmented nodular adrenocortical disease, schizophrenia, striatal degeneration, autosomal dominant.
• BP4: Computational evidence support a benign effect (MetaRNN=0.28960118).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PDE8B	NM_003719.5	c.107C>G	p.Pro36Arg	missense_variant	1/22	ENST00000264917.10	NP_003710.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PDE8B	ENST00000264917.10	c.107C>G	p.Pro36Arg	missense_variant	1/22	1	NM_003719.5	ENSP00000264917.6
ENSG00000284762	ENST00000646262.1	c.-34+92511C>G		intron_variant				ENSP00000493971.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000144 AC: 2 AN: 1390292 Hom.: 0 Cov.: 32 AF XY: 0.00000290 AC XY: 2 AN XY: 689870

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: 0.00000184

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 03, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with PDE8B-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces proline with arginine at codon 36 of the PDE8B protein (p.Pro36Arg). The proline residue is weakly conserved and there is a moderate physicochemical difference between proline and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Benign	-0.070	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.038	.;.;T;.;.
Eigen	Benign	-0.41
Eigen_PC	Benign	-0.30
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.88	D;D;D;D;D
M_CAP	Pathogenic	0.76	D
MetaRNN	Benign	0.29	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N;N;N;N;N
PrimateAI	Pathogenic	0.92	D
PROVEAN	Benign	-0.47	N;N;N;N;N
REVEL	Benign	0.15
Sift	Benign	0.052	T;T;T;T;T
Sift4G	Benign	0.17	T;T;T;T;T
Polyphen		0.24	B;B;B;B;B
Vest4		0.18
MutPred		0.51		Gain of methylation at P36 (P = 0.0236);Gain of methylation at P36 (P = 0.0236);Gain of methylation at P36 (P = 0.0236);Gain of methylation at P36 (P = 0.0236);Gain of methylation at P36 (P = 0.0236);
MVP		0.33
MPC		1.4
ClinPred		0.67	D
GERP RS		3.1
Varity_R		0.16
gMVP		0.27

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: rs1748192964; hg19: chr5-76506857;