dbSNP rs62645748: CRB1:p.Cys948Tyr (chr1-197434706-G-A) – ACMG Classification: Pathogenic (14 pts)

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM1PM5PP2PP3PP5_Very_Strong

The NM_201253.3(CRB1):c.2843G>A(p.Cys948Tyr) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000334 in 1,611,346 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. 14/24 in silico tools predict a damaging outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C948S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00035 ( 1 hom. )

Consequence

CRB1
NM_201253.3 missense, splice_region

Scores

Splicing: ADA: 0.9990

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:33O:2

Conservation

PhyloP100: 9.00

Publications

72 publications found

Variant links:

Genes affected

CRB1 (HGNC:2343): (crumbs cell polarity complex component 1) This gene encodes a protein which is similar to the Drosophila crumbs protein and localizes to the inner segment of mammalian photoreceptors. In Drosophila crumbs localizes to the stalk of the fly photoreceptor and may be a component of the molecular scaffold that controls proper development of polarity in the eye. Mutations in this gene are associated with a severe form of retinitis pigmentosa, RP12, and with Leber congenital amaurosis. Alternate splicing results in multiple transcript variants, some protein coding and some non-protein coding.[provided by RefSeq, Apr 2012]

CRB1 Gene-Disease associations (from GenCC):

hereditary macular dystrophy
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
Leber congenital amaurosis 8
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, G2P
retinitis pigmentosa 12
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
Leber congenital amaurosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
nanophthalmia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
pigmented paravenous retinochoroidal atrophy
Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, G2P
retinitis pigmentosa
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

CRB1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 14 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 10 uncertain in NM_201253.3

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-197429614-T-C is described in ClinVar as Pathogenic. ClinVar VariationId is 427863.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 168 curated pathogenic missense variants (we use a threshold of 10). The gene has 18 curated benign missense variants. Gene score misZ: -1.2832 (below the threshold of 3.09). Trascript score misZ: 0.62189 (below the threshold of 3.09). GenCC associations: The gene is linked to Leber congenital amaurosis 8, retinitis pigmentosa 12, pigmented paravenous retinochoroidal atrophy, hereditary macular dystrophy, retinitis pigmentosa, Leber congenital amaurosis, nanophthalmia.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

PP5

Variant 1-197434706-G-A is Pathogenic according to our data. Variant chr1-197434706-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 39614.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_201253.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CRB1	NM_201253.3	MANE Select	c.2843G>A	p.Cys948Tyr	missense splice_region	Exon 9 of 12	NP_957705.1	P82279-1
CRB1	NM_001257965.2		c.2771G>A	p.Cys924Tyr	missense splice_region	Exon 12 of 15	NP_001244894.1	F5H0L2
CRB1	NM_001193640.2		c.2507G>A	p.Cys836Tyr	missense splice_region	Exon 7 of 10	NP_001180569.1	P82279-3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CRB1	ENST00000367400.8	TSL:1 MANE Select	c.2843G>A	p.Cys948Tyr	missense splice_region	Exon 9 of 12	ENSP00000356370.3	P82279-1
CRB1	ENST00000638467.1	TSL:1	c.2843G>A	p.Cys948Tyr	missense splice_region	Exon 9 of 11	ENSP00000491102.1	P82279-2
CRB1	ENST00000367399.6	TSL:1	c.2507G>A	p.Cys836Tyr	missense splice_region	Exon 7 of 10	ENSP00000356369.2	P82279-3

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152044

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000197

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000943

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000368

Gnomad OTH

AF:

0.000957

GnomAD2 exomes

AF:

0.000212

AC:

AN:

249806

AF XY:

0.000214

show subpopulations

Gnomad AFR exome

AF:

0.0000637

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000407

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.000347

AC:

507

AN:

1459302

Hom.:

Cov.:

AF XY:

0.000343

AC XY:

249

AN XY:

726120

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33374

American (AMR)

AF:

0.000134

AC:

AN:

44654

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26078

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39664

South Asian (SAS)

AF:

0.00

AC:

AN:

86178

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53336

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.000432

AC:

480

AN:

1110010

Other (OTH)

AF:

0.000315

AC:

AN:

60258

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.459

Heterozygous variant carriers

112

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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:

0.000204

AC:

AN:

152044

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74248

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41390

American (AMR)

AF:

0.000197

AC:

AN:

15236

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:

4826

European-Finnish (FIN)

AF:

0.0000943

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000368

AC:

AN:

68014

Other (OTH)

AF:

0.000957

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.535

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

Alfa

AF:

0.000367

Hom.:

Bravo

AF:

0.000234

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.000206

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000237

ClinVar

ClinVar submissions

Significance:Pathogenic

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (8)

Leber congenital amaurosis 8 (7)

Retinitis pigmentosa 12 (5)

CRB1-related disorder (3)

Retinal dystrophy (3)

Leber congenital amaurosis (2)

Pigmented paravenous retinochoroidal atrophy (2)

Cone dystrophy (1)

Hereditary macular dystrophy (1)

Retinitis pigmentosa (1)

Retinitis pigmentosa 12;C1868310:Pigmented paravenous retinochoroidal atrophy;C3151202:Leber congenital amaurosis 8 (1)

Retinitis pigmentosa 12;C3151202:Leber congenital amaurosis 8 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.85

BayesDel_addAF

Pathogenic

0.32

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.48

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.69

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.89

M_CAP

Pathogenic

0.93

MetaRNN

Pathogenic

0.98

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.2

PhyloP100

9.0

PrimateAI

Uncertain

0.64

PROVEAN

Pathogenic

-9.3

REVEL

Pathogenic

0.89

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.97

MVP

0.99

MPC

0.28

ClinPred

0.97

GERP RS

5.3

Varity_R

0.94

gMVP

0.98

Mutation Taster

=0/100

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.89

SpliceAI score (max)

0.10

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over