chr8-86667134-C-G

Position:

chr8-86667134-C-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The ENST00000320005.6(CNGB3):c.644-1G>C variant causes a splice acceptor change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000018 in 1,613,178 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

CNGB3
ENST00000320005.6 splice_acceptor

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8O:1

Conservation

PhyloP100: 7.88

Variant links:

Genes affected

CNGB3 (HGNC:2153): (cyclic nucleotide gated channel subunit beta 3) This gene encodes the beta subunit of a cyclic nucleotide-gated ion channel. The encoded beta subunit appears to play a role in modulation of channel function in cone photoreceptors. This heterotetrameric channel is necessary for sensory transduction, and mutations in this gene have been associated with achromatopsia 3, progressive cone dystrophy, and juvenile macular degeneration, also known as Stargardt Disease. [provided by RefSeq, Feb 2010]

CNGB3 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 8-86667134-C-G is Pathogenic according to our data. Variant chr8-86667134-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 188780.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-86667134-C-G is described in Lovd as [Pathogenic]. Variant chr8-86667134-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNGB3	NM_019098.5 linkuse as main transcript	c.644-1G>C		splice_acceptor_variant		ENST00000320005.6	NP_061971.3
CNGB3	XM_011517138.3 linkuse as main transcript	c.230-1G>C		splice_acceptor_variant			XP_011515440.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CNGB3	ENST00000320005.6 linkuse as main transcript	c.644-1G>C		splice_acceptor_variant		1	NM_019098.5	ENSP00000316605	P1	Q9NQW8-1
CNGB3	ENST00000681746.1 linkuse as main transcript	c.644-1G>C		splice_acceptor_variant, NMD_transcript_variant				ENSP00000505959

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152148

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000577

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

GnomAD3 exomes

AF:

0.0000399

AC:

AN:

250676

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135446

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000894

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000178

AC:

AN:

1461030

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

726820

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.000766

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152148

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74308

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000577

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000113

Hom.:

Bravo

AF:

0.0000378

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Achromatopsia 3

Pathogenic:3

Pathogenic, no assertion criteria provided	research	Molecular Genetics Laboratory, Institute for Ophthalmic Research	Mar 27, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Mar 18, 2022	- -
Likely pathogenic, criteria provided, single submitter	literature only	Counsyl	May 12, 2014	- -

Achromatopsia

Pathogenic:2

Pathogenic, no assertion criteria provided	research	Sharon lab, Hadassah-Hebrew University Medical Center	Jun 23, 2019	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 20, 2024	This sequence change affects an acceptor splice site in intron 5 of the CNGB3 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in CNGB3 are known to be pathogenic (PMID: 28795510). This variant is present in population databases (rs201794629, gnomAD 0.09%). Disruption of this splice site has been observed in individuals with achromatopsia (PMID: 15657609, 25616768, 28795510). ClinVar contains an entry for this variant (Variation ID: 188780). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jan 06, 2020	Canonical splice site variant in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 31456290, 28795510, 25616768, 15657609, 31544997) -

CNGB3-related disorder

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 26, 2024

The CNGB3 c.644-1G>C variant is predicted to disrupt the AG splice acceptor site and interfere with normal splicing. This variant was reported in individuals with achromatopsia (Kohl et al. 2005. PubMed ID: 15657609; Table S2, Sharon et al. 2019. PubMed ID: 31456290). This variant is reported in 0.097% of alleles in individuals of Ashkenazi Jewish descent in gnomAD. Variants that disrupt the consensus splice acceptor site in CNGB3 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Retinitis pigmentosa;C1849792:Achromatopsia 3;C1855465:Severe early-childhood-onset retinal dystrophy

Other:1

not provided, no classification provided

phenotyping only

GenomeConnect - Invitae Patient Insights Network

Variant interpreted as Pathogenic and reported on 02-21-2020 by Invitae. GenomeConnect-Invitae Patient Insights Network assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. Registry team members make no attempt to reinterpret the clinical significance of the variant. Phenotypic details are available under supporting information. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Uncertain

0.010

CADD

Pathogenic

DANN

Uncertain

0.98

Eigen

Pathogenic

0.94

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Pathogenic

0.99

MutationTaster

Benign

1.0

GERP RS

4.7

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.91

SpliceAI score (max)

0.67

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.67

Position offset: -1

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