1-197356848-T-C

Position:

• chr1-197356848-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_201253.3(CRB1):​c.1006T>C​(p.Cys336Arg) variant causes a missense change. 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 Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CRB1 NM_201253.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity no assertion criteria provided P:1 U:1
• Conservation: PhyloP100: 6.60

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 Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a disulfide_bond (size 9) in uniprot entity CRUM1_HUMAN there are 8 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, 0.987

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CRB1	NM_201253.3	c.1006T>C	p.Cys336Arg	missense_variant	5/12	ENST00000367400.8	NP_957705.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CRB1	ENST00000367400.8	c.1006T>C	p.Cys336Arg	missense_variant	5/12	1	NM_201253.3	ENSP00000356370.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

Retinal dystrophy Pathogenic:1 Uncertain:1

Uncertain significance, no assertion criteria provided	clinical testing	Centre for Genomic Medicine, Manchester, Central Manchester University Hospitals	-	- -
Likely pathogenic, no assertion criteria provided	research	NIHR Bioresource Rare Diseases, University of Cambridge	Jan 01, 2015	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.43	.;T;.;D;.
Eigen	Pathogenic	0.79
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.82	T;T;.;T;D
M_CAP	Pathogenic	0.83	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.3	H;.;H;H;.
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-11	D;D;.;D;D
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;D;.;D;D
Sift4G	Pathogenic	0.0	D;D;.;D;D
Polyphen		1.0	.;D;.;D;D
Vest4		0.94
MutPred		0.86		Gain of disorder (P = 0.0985);.;Gain of disorder (P = 0.0985);Gain of disorder (P = 0.0985);.;
MVP		0.99
MPC		0.29
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.98
gMVP		0.98

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: rs878853370; hg19: chr1-197325978;