1-197421008-T-C

Position:

• chr1-197421008-T-C

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_201253.3(CRB1):​c.1180T>C​(p.Cys394Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CRB1 NM_201253.3 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 7.48

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]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a domain EGF-like 9 (size 56) in uniprot entity CRUM1_HUMAN there are 6 pathogenic changes around while only 0 benign (100%) in NM_201253.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.958
• PP5: Variant 1-197421008-T-C is Pathogenic according to our data. Variant chr1-197421008-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 190990.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-197421008-T-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CRB1	NM_201253.3	c.1180T>C	p.Cys394Arg	missense_variant	6/12	ENST00000367400.8	NP_957705.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CRB1	ENST00000367400.8	c.1180T>C	p.Cys394Arg	missense_variant	6/12	1	NM_201253.3	ENSP00000356370	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive retinitis pigmentosa Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

Faculty of Health Sciences, Beirut Arab University

Sep 10, 2015

- -

Retinitis pigmentosa 12;C3151202:Leber congenital amaurosis 8 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 27, 2023

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 394 of the CRB1 protein (p.Cys394Arg). This missense change has been observed in individuals with retinitis pigmentosa (PMID: 24265693). For these reasons, this variant has been classified as Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CRB1 protein function. ClinVar contains an entry for this variant (Variation ID: 190990). -

not provided Pathogenic:1

Likely pathogenic, flagged submission

research

Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center

-

- -

Retinitis pigmentosa 12 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center

Mar 14, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	.;D;.;D;.
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D;.;D;D
M_CAP	Pathogenic	0.63	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D
MetaSVM	Pathogenic	0.96	D
MutationAssessor	Pathogenic	3.2	M;.;M;M;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-11	D;D;.;D;D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D;D;.;D;D
Sift4G	Pathogenic	0.0	D;D;.;D;D
Polyphen		1.0, 1.0, 1.0	.;D;.;D;D
Vest4		0.97
MutPred		0.76		Gain of disorder (P = 0.0589);.;Gain of disorder (P = 0.0589);Gain of disorder (P = 0.0589);.;
MVP		0.98
MPC		0.29
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.96
gMVP		0.97

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

LitVar

Other links and lift over

dbSNP: rs786205450; hg19: chr1-197390138; COSMIC: COSV66332601; COSMIC: COSV66332601;