Genetic Variant CNGB3:p.Glu336Lys (chr8-86644671-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_019098.5(CNGB3):c.1006G>A(p.Glu336Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000316 in 1,583,540 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

CNGB3
NM_019098.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.48

Publications

11 publications found

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 Gene-Disease associations (from GenCC):

achromatopsia 3
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia
CNGB3-related retinopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
cone dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
achromatopsia
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
severe early-childhood-onset retinal dystrophy
Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

CNGB3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNGB3	NM_019098.5 link	c.1006G>A	p.Glu336Lys	missense_variant	Exon 9 of 18	ENST00000320005.6	NP_061971.3
CNGB3	XM_011517138.3 link	c.592G>A	p.Glu198Lys	missense_variant	Exon 7 of 16		XP_011515440.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
CNGB3	ENST00000320005.6 link	c.1006G>A	p.Glu336Lys	missense_variant	Exon 9 of 18	1	NM_019098.5	ENSP00000316605.5
CNGB3	ENST00000681546.1 link	n.826G>A		non_coding_transcript_exon_variant	Exon 4 of 13
CNGB3	ENST00000681746.1 link	n.1006G>A		non_coding_transcript_exon_variant	Exon 9 of 19			ENSP00000505959.1

Frequencies

GnomAD3 genomes

AF:

0.00000664

AC:

AN:

150506

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:

0.0000149

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000279

AC:

AN:

1433034

Hom.:

Cov.:

AF XY:

0.00000281

AC XY:

AN XY:

712876

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

32356

American (AMR)

AF:

0.00

AC:

AN:

42862

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25090

East Asian (EAS)

AF:

0.00

AC:

AN:

39114

South Asian (SAS)

AF:

0.00

AC:

AN:

82398

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51468

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5596

European-Non Finnish (NFE)

AF:

0.00000365

AC:

AN:

1095348

Other (OTH)

AF:

0.00

AC:

AN:

58802

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000266003), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.388

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:

0.00000664

AC:

AN:

150506

Hom.:

Cov.:

AF XY:

0.0000136

AC XY:

AN XY:

73448

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

41146

American (AMR)

AF:

0.00

AC:

AN:

15060

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3424

East Asian (EAS)

AF:

0.00

AC:

AN:

5176

South Asian (SAS)

AF:

0.00

AC:

AN:

4794

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10388

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.0000149

AC:

AN:

67228

Other (OTH)

AF:

0.00

AC:

AN:

2064

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.275

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

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Uncertain

0.077

BayesDel_noAF

Benign

-0.13

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.66

Eigen

Pathogenic

0.86

Eigen_PC

Pathogenic

0.83

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.99

M_CAP

Benign

0.074

MetaRNN

Uncertain

0.69

MetaSVM

Uncertain

-0.18

MutationAssessor

Pathogenic

3.4

PhyloP100

2.5

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-3.9

REVEL

Uncertain

0.36

Sift

Uncertain

0.015

Sift4G

Uncertain

0.0040

Polyphen

1.0

Vest4

0.58

MutPred

0.63

Gain of methylation at E336 (P = 0.007);

MVP

0.84

MPC

0.21

ClinPred

1.0

GERP RS

6.0

Varity_R

0.67

gMVP

0.74

Mutation Taster

=26/74

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.36

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.36

Position offset: 15

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

Computational scores

Splicing

Publications

Other links and lift over