chr3-33114550-C-G

Position:

• chr3-33114550-C-G

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The ENST00000320954.11(CRTAP):​c.471+2C>G variant causes a splice donor change. The variant allele was found at a frequency of 0.0000014 in 1,428,398 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CRTAP ENST00000320954.11 splice_donor
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 4.71

Genes affected

CRTAP (HGNC:2379): (cartilage associated protein) The protein encoded by this gene is similar to the chicken and mouse CRTAP genes. The encoded protein is a scaffolding protein that may influence the activity of at least one member of the cytohesin/ARNO family in response to specific cellular stimuli. Defects in this gene are associated with osteogenesis imperfecta, a connective tissue disorder characterized by bone fragility and low bone mass. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-33114550-C-G is Pathogenic according to our data. Variant chr3-33114550-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 212732.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CRTAP	NM_006371.5	c.471+2C>G		splice_donor_variant		ENST00000320954.11	NP_006362.1
CRTAP	NM_001393363.1	c.471+2C>G		splice_donor_variant			NP_001380292.1
CRTAP	NM_001393364.1	c.471+2C>G		splice_donor_variant			NP_001380293.1
CRTAP	NM_001393365.1	c.471+2C>G		splice_donor_variant			NP_001380294.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CRTAP	ENST00000320954.11	c.471+2C>G		splice_donor_variant		1	NM_006371.5	ENSP00000323696	P1
CRTAP	ENST00000449224.1	c.471+2C>G		splice_donor_variant		2		ENSP00000409997

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000140 AC: 2 AN: 1428398 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 707764

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: 0.00000182

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Osteogenesis imperfecta type 7 Pathogenic:1

Likely pathogenic, no assertion criteria provided

clinical testing

Knight Diagnostic Laboratories, Oregon Health and Sciences University

Apr 10, 2014

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Benign	-0.17
CADD	Pathogenic	29
DANN	Benign	0.87
Eigen	Pathogenic	0.68
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.91	D
MutationTaster	Benign	1.0	D;D
GERP RS		0.99
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.86		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.86		Position offset: -2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs137853943; hg19: chr3-33156042;