8-86739675-TC-T

Position:

• chr8-86739675-TC-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_019098.5(CNGB3):​c.190del​(p.Glu64SerfsTer19) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,460,582 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. E64E) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: CNGB3 NM_019098.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 0.640

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]

(HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-86739675-TC-T is Pathogenic according to our data. Variant chr8-86739675-TC-T is described in ClinVar as [Pathogenic]. Clinvar id is 427646.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr8-86739675-TC-T is described in Lovd as [Likely_pathogenic]. Variant chr8-86739675-TC-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CNGB3	NM_019098.5	c.190del	p.Glu64SerfsTer19	frameshift_variant	2/18	ENST00000320005.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CNGB3	ENST00000320005.6	c.190del	p.Glu64SerfsTer19	frameshift_variant	2/18	1	NM_019098.5	P1
	ENST00000519041.1	n.449-21160del		intron_variant, non_coding_transcript_variant		3
CNGB3	ENST00000519777.1	n.172del		non_coding_transcript_exon_variant	2/4	2
CNGB3	ENST00000681746.1	c.190del	p.Glu64SerfsTer19	frameshift_variant, NMD_transcript_variant	2/19

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1460582 Hom.: 0 Cov.: 39 AF XY: 0.00000275 AC XY: 2 AN XY: 726662

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: 0.00000720

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Achromatopsia 3 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Genomics England Pilot Project, Genomics England	-	- -
Pathogenic, no assertion criteria provided	research	Molecular Genetics Laboratory, Institute for Ophthalmic Research	Mar 27, 2017	- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs1554619292; hg19: chr8-87751903;