9-123370912-G-T

Variant names:

• chr9-123370912-G-T
• rs879255250
• NM_173689.7:c.1859G>T
• CRB2 p.Cys620Phe

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_173689.7(CRB2):​c.1859G>T​(p.Cys620Phe) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C620S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CRB2 NM_173689.7 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.88
• Publications: 5 publications found

Genes affected

CRB2 (HGNC:18688): (crumbs cell polarity complex component 2) This gene encodes a member of a family of proteins that are components of the Crumbs cell polarity complex. In mammals, members of this family are thought to play a role in many cellular processes in early embryonic development. A similar protein in Drosophila determines apicobasal polarity in embryonic epithelial cells. Mutations in this gene are associated with focal segmental glomerulosclerosis 9, and with ventriculomegaly with cystic kidney disease. [provided by RefSeq, Aug 2016]

CRB2 Gene-Disease associations (from GenCC):

• focal segmental glomerulosclerosis 9

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae)
• ventriculomegaly-cystic kidney disease

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Genomics England PanelApp
• familial idiopathic steroid-resistant nephrotic syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinitis pigmentosa

  Inheritance: AR Classification: LIMITED Submitted by: G2P

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.996

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_173689.7. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRB2	NM_173689.7	MANE Select	c.1859G>T	p.Cys620Phe	missense	Exon 7 of 13	NP_775960.4
	CRB2	NR_104603.2		n.973G>T		non_coding_transcript_exon	Exon 2 of 9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRB2	ENST00000373631.8	TSL:1 MANE Select	c.1859G>T	p.Cys620Phe	missense	Exon 7 of 13	ENSP00000362734.3	Q5IJ48-1
	CRB2	ENST00000896215.1		c.1859G>T	p.Cys620Phe	missense	Exon 7 of 13	ENSP00000566274.1
	CRB2	ENST00000359999.7	TSL:2	c.1859G>T	p.Cys620Phe	missense	Exon 7 of 10	ENSP00000353092.3	Q5IJ48-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 59

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.86
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.91	D
Eigen	Pathogenic	0.98
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.75	T
M_CAP	Pathogenic	0.61	D
MetaRNN	Pathogenic	1.0	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.7	H
PhyloP100		9.9
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-11	D
REVEL	Pathogenic	0.89
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Varity_R		1.0
gMVP		0.97
Mutation Taster		=7/93	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs879255250;

hg19: chr9-126133191;