NM_001297.5:c.2285G>A

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1PM5PP3_StrongPP5_Very_Strong

The NM_001297.5(CNGB1):c.2285G>A(p.Arg762His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000062 in 1,613,574 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R762C) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

CNGB1
NM_001297.5 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4U:1

Conservation

PhyloP100: 7.51

Publications

6 publications found

Variant links:

Genes affected

CNGB1 (HGNC:2151): (cyclic nucleotide gated channel subunit beta 1) In humans, the rod photoreceptor cGMP-gated cation channel helps regulate ion flow into the rod photoreceptor outer segment in response to light-induced alteration of the levels of intracellular cGMP. This channel consists of two subunits, alpha and beta, with the protein encoded by this gene representing the beta subunit. Defects in this gene are a cause of cause of retinitis pigmentosa type 45. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2013]

CNGB1 Gene-Disease associations (from GenCC):

CNGB1-related retinopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
retinitis pigmentosa 45
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
retinitis pigmentosa
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

CNGB1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 16 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 11 uncertain in NM_001297.5

PM5

Other missense variant is known to change same aminoacid residue: Variant chr16-57915269-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 812286.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.959

PP5

Variant 16-57915268-C-T is Pathogenic according to our data. Variant chr16-57915268-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 437972.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNGB1	NM_001297.5 link	c.2285G>A	p.Arg762His	missense_variant	Exon 23 of 33	ENST00000251102.13	NP_001288.3	Q14028-1
CNGB1	NM_001286130.2 link	c.2267G>A	p.Arg756His	missense_variant	Exon 23 of 33		NP_001273059.1	Q14028-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CNGB1	ENST00000251102.13 link	c.2285G>A	p.Arg762His	missense_variant	Exon 23 of 33	1	NM_001297.5	ENSP00000251102.8		Q14028-1
CNGB1	ENST00000564448.5 link	c.2267G>A	p.Arg756His	missense_variant	Exon 23 of 33	1		ENSP00000454633.1		Q14028-4

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152086

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:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000161

AC:

AN:

249018

AF XY:

0.00000740

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000556

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461488

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727040

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33472

American (AMR)

AF:

0.00

AC:

AN:

44708

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26116

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86218

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5756

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111752

Other (OTH)

AF:

0.0000166

AC:

AN:

60366

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152086

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74284

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41406

American (AMR)

AF:

0.00

AC:

AN:

15266

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10596

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68008

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Retinitis pigmentosa

Pathogenic:2Uncertain:1

Jun 29, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: CNGB1 c.2285G>A (p.Arg762His) results in a non-conservative amino acid change in the encoded protein sequence, altering a highly conserved residue (HGMD) in which another missense variant (p.Arg762Cys) has been classified as pathogenic (ClinVar). Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.6e-05 in 249018 control chromosomes (gnomAD). c.2285G>A has been reported in the literature in homozygous individuals affected with Retinitis Pigmentosa (e.g. Carss_2017, Jespersgaard_2019). These data indicate that the variant is likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 32581362, 28041643, 31570810, 35743231, 30718709). Three submitters have cited clinical-significance assessments for this variant to ClinVar after 2014, and classified it as pathogenic/likely pathogenic (n=2) or uncertain significance (n=1). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Apr 01, 2018

Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:research

- -

Jan 01, 2015

NIHR Bioresource Rare Diseases, University of Cambridge

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:research

- -

not provided

Pathogenic:1

Dec 31, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant disrupts the p.Arg762 amino acid residue in CNGB1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 21987686, 24339724, 29202463). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 762 of the CNGB1 protein (p.Arg762His). This variant is present in population databases (rs760373259, gnomAD 0.006%). This missense change has been observed in individuals with retinitis pigmentosa (PMID: 28041643, 30718709, 31570810). ClinVar contains an entry for this variant (Variation ID: 437972). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CNGB1 protein function. For these reasons, this variant has been classified as Pathogenic. -

Retinitis pigmentosa 45

Pathogenic:1

Mar 29, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.43

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.79

D;.

Eigen

Pathogenic

0.93

Eigen_PC

Pathogenic

0.84

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Pathogenic

0.46

MetaRNN

Pathogenic

0.96

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.7

H;.

PhyloP100

7.5

PrimateAI

Uncertain

0.54

PROVEAN

Pathogenic

-5.0

D;D

REVEL

Pathogenic

0.96

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.91

MutPred

0.83

Gain of methylation at R765 (P = 0.0622);.;

MVP

0.97

MPC

0.55

ClinPred

1.0

GERP RS

5.3

Varity_R

0.91

gMVP

0.71

Mutation Taster

=4/96

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.11

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over