chr9-123370939-G-C

Variant names:

• chr9-123370939-G-C
• rs879255252
• NM_173689.7:c.1886G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_173689.7(CRB2):​c.1886G>C​(p.Cys629Ser) 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 Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. C629C) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CRB2 NM_173689.7 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 6.80
• Publications: 4 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: G2P, Genomics England PanelApp, Orphanet
• 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 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.997
• PP5: Variant 9-123370939-G-C is Pathogenic according to our data. Variant chr9-123370939-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 180702.Status of the report is no_assertion_criteria_provided, 0 stars.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRB2	NM_173689.7	MANE Select	c.1886G>C	p.Cys629Ser	missense	Exon 7 of 13	NP_775960.4
	CRB2	NR_104603.2		n.1000G>C		non_coding_transcript_exon	Exon 2 of 9

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRB2	ENST00000373631.8	TSL:1 MANE Select	c.1886G>C	p.Cys629Ser	missense	Exon 7 of 13	ENSP00000362734.3
	CRB2	ENST00000359999.7	TSL:2	c.1886G>C	p.Cys629Ser	missense	Exon 7 of 10	ENSP00000353092.3
	CRB2	ENST00000460253.1	TSL:2	n.890G>C		non_coding_transcript_exon	Exon 2 of 9	ENSP00000435279.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 54

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Focal segmental glomerulosclerosis 9 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.90	D
Eigen	Pathogenic	0.76
Eigen_PC	Uncertain	0.55
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.71	T
M_CAP	Pathogenic	0.85	D
MetaRNN	Pathogenic	1.0	D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Pathogenic	4.4	H
PhyloP100		6.8
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-9.9	D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.98
MutPred		0.99		Gain of disorder (P = 0.0333)
MVP		0.99
MPC		0.42
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.99
gMVP		0.97
Mutation Taster		=0/100	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs879255252; hg19: chr9-126133218;