rs1174949911

Positions:

• chr8-86668019-C-G
• chr8-86668019-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_019098.5(CNGB3):​c.643G>C​(p.Asp215His) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000684 in 1,461,798 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 (no stars).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CNGB3 NM_019098.5 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 3.95

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.923
• PP5: Variant 8-86668019-C-G is Pathogenic according to our data. Variant chr8-86668019-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 427672.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr8-86668019-C-G is described in Lovd as [Likely_pathogenic]. Variant chr8-86668019-C-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNGB3	NM_019098.5	c.643G>C	p.Asp215His	missense_variant, splice_region_variant	5/18	ENST00000320005.6	NP_061971.3
CNGB3	XM_011517138.3	c.229G>C	p.Asp77His	missense_variant, splice_region_variant	3/16		XP_011515440.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CNGB3	ENST00000320005.6	c.643G>C	p.Asp215His	missense_variant, splice_region_variant	5/18	1	NM_019098.5	ENSP00000316605.5
CNGB3	ENST00000681746.1	n.643G>C		splice_region_variant, non_coding_transcript_exon_variant	5/19			ENSP00000505959.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461798 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727198

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Achromatopsia 3 Pathogenic:1

Likely pathogenic, no assertion criteria provided

research

Molecular Genetics Laboratory, Institute for Ophthalmic Research

Mar 27, 2017

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.54
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	31
DANN	Uncertain	0.99
DEOGEN2	Benign	0.39	T
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.74	T
M_CAP	Uncertain	0.25	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Pathogenic	3.1	M
PrimateAI	Benign	0.41	T
PROVEAN	Uncertain	-3.3	D
REVEL	Pathogenic	0.75
Sift	Benign	0.037	D
Sift4G	Uncertain	0.0090	D
Polyphen		0.88	P
Vest4		0.89
MutPred		0.71		Gain of sheet (P = 0.0827);
MVP		0.98
MPC		0.085
ClinPred		0.94	D
GERP RS		6.1
Varity_R		0.30
gMVP		0.74

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.54		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.54		Position offset: 0

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

Publications

LitVar

Other links and lift over

dbSNP: rs1174949911; hg19: chr8-87680247;