Genetic Variant NM_201253.3:c.2308G>A (chr1-197427633-G-A) – ACMG Classification: Pathogenic (17 pts)

Variant summary

Our verdict is Pathogenic. The variant received 17 ACMG points: 17P and 0B. PM1PM5PP2PP3_StrongPP5_Very_Strong

The NM_201253.3(CRB1):c.2308G>A(p.Gly770Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000273 in 1,613,766 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G770R) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

CRB1
NM_201253.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:13U:1

Conservation

PhyloP100: 7.51

Publications

6 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: G2P, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
retinitis pigmentosa 12
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
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: G2P, Orphanet
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 17 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 14 uncertain in NM_201253.3

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-197427633-G-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3249848.Status of the report is criteria_provided_single_submitter, 1 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

MetaRNN computational evidence supports a deleterious effect, 0.989

PP5

Variant 1-197427633-G-A is Pathogenic according to our data. Variant chr1-197427633-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 236478.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
CRB1	NM_201253.3	MANE Select	c.2308G>A	p.Gly770Ser	missense	Exon 7 of 12	NP_957705.1
CRB1	NM_001257965.2		c.2101G>A	p.Gly701Ser	missense	Exon 9 of 15	NP_001244894.1
CRB1	NM_001193640.2		c.1972G>A	p.Gly658Ser	missense	Exon 5 of 10	NP_001180569.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CRB1	ENST00000367400.8	TSL:1 MANE Select	c.2308G>A	p.Gly770Ser	missense	Exon 7 of 12	ENSP00000356370.3
CRB1	ENST00000638467.1	TSL:1	c.2308G>A	p.Gly770Ser	missense	Exon 7 of 11	ENSP00000491102.1
CRB1	ENST00000367399.6	TSL:1	c.1972G>A	p.Gly658Ser	missense	Exon 5 of 10	ENSP00000356369.2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152056

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000199

AC:

AN:

250752

AF XY:

0.0000221

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000353

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000274

AC:

AN:

1461710

Hom.:

Cov.:

AF XY:

0.0000371

AC XY:

AN XY:

727144

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44688

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86242

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53364

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000333

AC:

AN:

1111958

Other (OTH)

AF:

0.0000331

AC:

AN:

60386

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

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:

0.0000263

AC:

AN:

152056

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74264

show subpopulations

African (AFR)

AF:

0.0000242

AC:

AN:

41404

American (AMR)

AF:

0.0000656

AC:

AN:

15254

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5196

South Asian (SAS)

AF:

0.00

AC:

AN:

4812

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10588

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68016

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

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:

0.0000602

Hom.:

Bravo

AF:

0.0000189

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

ClinVar submissions as Germline

Significance:Pathogenic/Likely pathogenic

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Retinal dystrophy (4)

Retinitis pigmentosa 12 (4)

Leber congenital amaurosis 8 (2)

Leber congenital amaurosis (1)

Pigmented paravenous retinochoroidal atrophy (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

Benign

0.25

BayesDel_addAF

Pathogenic

0.29

BayesDel_noAF

Pathogenic

0.36

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.51

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.94

M_CAP

Pathogenic

0.53

MetaRNN

Pathogenic

0.99

MetaSVM

Uncertain

0.69

MutationAssessor

Uncertain

2.7

PhyloP100

7.5

PrimateAI

Benign

0.34

PROVEAN

Pathogenic

-5.3

REVEL

Pathogenic

0.82

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.012

Polyphen

1.0

Vest4

0.94

MutPred

0.83

Loss of MoRF binding (P = 0.1439)

MVP

0.95

MPC

0.23

ClinPred

0.98

GERP RS

5.6

Varity_R

0.62

gMVP

0.93

Mutation Taster

=0/100

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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