chr9-123362873-C-T

Position:

• chr9-123362873-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_173689.7(CRB2):​c.103C>T​(p.Pro35Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000014 in 1,426,648 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CRB2 NM_173689.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0450

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.101922005).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CRB2	NM_173689.7	c.103C>T	p.Pro35Ser	missense_variant	2/13	ENST00000373631.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CRB2	ENST00000373631.8	c.103C>T	p.Pro35Ser	missense_variant	2/13	1	NM_173689.7	P1
CRB2	ENST00000359999.7	c.103C>T	p.Pro35Ser	missense_variant	2/10	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000140 AC: 2 AN: 1426648 Hom.: 0 Cov.: 30 AF XY: 0.00000142 AC XY: 1 AN XY: 702676

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000184

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 30, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. 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 not expected to disrupt CRB2 protein function. This variant has not been reported in the literature in individuals affected with CRB2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 35 of the CRB2 protein (p.Pro35Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.086	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	17
DANN	Uncertain	1.0
DEOGEN2	Benign	0.059	.;T
Eigen	Benign	-0.84
Eigen_PC	Benign	-0.81
FATHMM_MKL	Benign	0.019	N
LIST_S2	Benign	0.58	T;T
M_CAP	Benign	0.059	D
MetaRNN	Benign	0.10	T;T
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	0.69	N;N
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-0.67	N;N
REVEL	Benign	0.057
Sift	Benign	0.25	T;T
Sift4G	Benign	0.20	T;T
Polyphen		0.12	B;B
Vest4		0.19
MutPred		0.41		Gain of phosphorylation at P35 (P = 0.0369);Gain of phosphorylation at P35 (P = 0.0369);
MVP		0.73
MPC		0.28
ClinPred		0.080	T
GERP RS		0.50
Varity_R		0.044
gMVP		0.39

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-126125152;