NM_000283.4:c.794G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 2P and 11B. PM1BP4_ModerateBP6BS1BS2

The NM_000283.4(PDE6B):c.794G>A(p.Arg265Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00106 in 1,613,782 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R265W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00082 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 5 hom. )

Consequence

PDE6B
NM_000283.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:3

Conservation

PhyloP100: 9.58

Publications

12 publications found

Variant links:

Genes affected

PDE6B (HGNC:8786): (phosphodiesterase 6B) Photon absorption triggers a signaling cascade in rod photoreceptors that activates cGMP phosphodiesterase (PDE), resulting in the rapid hydrolysis of cGMP, closure of cGMP-gated cation channels, and hyperpolarization of the cell. PDE is a peripheral membrane heterotrimeric enzyme made up of alpha, beta, and gamma subunits. This gene encodes the beta subunit. Mutations in this gene result in retinitis pigmentosa and autosomal dominant congenital stationary night blindness. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2009]

PDE6B links:

PDE6B-AS1 (HGNC:40438): (PDE6B antisense RNA 1)

PDE6B-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 14 uncertain in NM_000283.4

BP4

Computational evidence support a benign effect (MetaRNN=0.16307157).

BP6

Variant 4-653934-G-A is Benign according to our data. Variant chr4-653934-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 197127.

BS1

Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.00108 (1581/1461472) while in subpopulation MID AF = 0.00295 (17/5768). AF 95% confidence interval is 0.00215. There are 5 homozygotes in GnomAdExome4. There are 839 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 5 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PDE6B	NM_000283.4 link	c.794G>A	p.Arg265Gln	missense_variant	Exon 4 of 22	ENST00000496514.6	NP_000274.3	P35913-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PDE6B	ENST00000496514.6 link	c.794G>A	p.Arg265Gln	missense_variant	Exon 4 of 22	1	NM_000283.4	ENSP00000420295.1		P35913-1

Frequencies

GnomAD3 genomes

AF:

0.000821

AC:

125

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000523

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00124

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00141

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00111

AC:

279

AN:

251060

AF XY:

0.00132

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000636

Gnomad ASJ exome

AF:

0.000298

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.00154

Gnomad OTH exome

AF:

0.000979

GnomAD4 exome

AF:

0.00108

AC:

1581

AN:

1461472

Hom.:

Cov.:

AF XY:

0.00115

AC XY:

839

AN XY:

727056

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33478

American (AMR)

AF:

0.000604

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.000268

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00242

AC:

209

AN:

86258

European-Finnish (FIN)

AF:

0.0000188

AC:

AN:

53140

Middle Eastern (MID)

AF:

0.00295

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00113

AC:

1251

AN:

1111874

Other (OTH)

AF:

0.00113

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.467

Heterozygous variant carriers

105

211

316

422

527

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

138

184

230

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000821

AC:

125

AN:

152310

Hom.:

Cov.:

AF XY:

0.000873

AC XY:

AN XY:

74482

show subpopulations

African (AFR)

AF:

0.000241

AC:

AN:

41572

American (AMR)

AF:

0.000523

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00115

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5174

South Asian (SAS)

AF:

0.00124

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00141

AC:

AN:

68026

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.506

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00102

Hom.:

Bravo

AF:

0.000831

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.00116

AC:

141

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00174

EpiControl

AF:

0.00237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:5Benign:2

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The PDE6B p.Arg265Gln variant was identified in a compound heterozygous patient with retinitis pigmentosa from a cohort of 99 patients with inherited retinal dystrophies and 21 healthy relatives (Bernardis_2016_PMID:28127548). The variant was identified in dbSNP (ID: rs144562730) and ClinVar (classified as likely benign by Illumina and uncertain significance by EGL Genetics). The variant was identified in control databases in 302 of 282448 chromosomes (2 homozygous) at a frequency of 0.001069 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database March 6, 2019, v2.1.1). The variant was observed in the following populations: South Asian in 70 of 30614 chromosomes (freq: 0.002287), European (non-Finnish) in 193 of 128836 chromosomes (freq: 0.001498), Other in 7 of 7214 chromosomes (freq: 0.00097), Latino in 22 of 35436 chromosomes (freq: 0.000621), Ashkenazi Jewish in 4 of 10352 chromosomes (freq: 0.000386), African in 5 of 24930 chromosomes (freq: 0.000201) and European (Finnish) in 1 of 25118 chromosomes (freq: 0.00004), but was not observed in the East Asian population. The p.Arg265 residue is conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence however three of four in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) predict a greater than 10% difference in splicing. However, this has not been confirmed by RNA analysis and is not predictive enough to assume pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Apr 28, 2015

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 11, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jun 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PDE6B: BS1, BS2 -

Retinitis pigmentosa

Uncertain:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. -

Congenital stationary night blindness autosomal dominant 2

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

AlphaMissense

Uncertain

0.42

BayesDel_addAF

Benign

0.0055

BayesDel_noAF

Pathogenic

0.23

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.68

.;D

Eigen

Pathogenic

0.73

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.97

D;D

M_CAP

Uncertain

0.087

MetaRNN

Benign

0.16

T;T

MetaSVM

Benign

-0.29

MutationAssessor

Benign

1.8

L;L

PhyloP100

9.6

PrimateAI

Uncertain

0.72

PROVEAN

Benign

-2.1

N;N

REVEL

Uncertain

0.58

Sift

Benign

0.16

T;T

Sift4G

Benign

0.31

T;T

Polyphen

1.0

D;D

Vest4

0.90

MVP

0.91

MPC

0.64

ClinPred

0.042

GERP RS

5.3

Varity_R

0.26

gMVP

0.63

Mutation Taster

=86/14

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over