17-40162804-C-A

Position:

• chr17-40162804-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_007359.5(CASC3):​c.688C>A​(p.Pro230Thr) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: CASC3 NM_007359.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.74

Genes affected

CASC3 (HGNC:17040): (CASC3 exon junction complex subunit) The product of this gene is a core component of the exon junction complex (EJC), a protein complex that is deposited on spliced mRNAs at exon-exon junctions and functions in nonsense-mediated mRNA decay (NMD). The encoded protein binds RNA and interacts with two other EJC core components. It is predominantly located in the cytoplasm, but shuttles into the nucleus where it localizes to nuclear speckles. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.918

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CASC3	NM_007359.5	c.688C>A	p.Pro230Thr	missense_variant	6/14	ENST00000264645.12
CASC3	XM_005257163.3	c.688C>A	p.Pro230Thr	missense_variant	6/14
CASC3	XM_047435623.1	c.688C>A	p.Pro230Thr	missense_variant	6/9
CASC3	XM_047435624.1	c.-231C>A		5_prime_UTR_variant	7/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CASC3	ENST00000264645.12	c.688C>A	p.Pro230Thr	missense_variant	6/14	1	NM_007359.5	P1
CASC3	ENST00000418132.7	n.919C>A		non_coding_transcript_exon_variant	6/8	1
CASC3	ENST00000474190.1	c.349C>A	p.Pro117Thr	missense_variant, NMD_transcript_variant	3/6	3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 22, 2023

The c.688C>A (p.P230T) alteration is located in exon 6 (coding exon 6) of the CASC3 gene. This alteration results from a C to A substitution at nucleotide position 688, causing the proline (P) at amino acid position 230 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.40
CADD	Pathogenic	29
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.46	T
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.96	D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	0.12	D
MutationAssessor	Uncertain	2.5	M
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-8.0	D
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.020	D
Polyphen		1.0	D
Vest4		0.95
MutPred		0.76		Gain of phosphorylation at P230 (P = 0.0357);
MVP		0.58
MPC		1.9
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.94
gMVP		0.68

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: rs1989337206; hg19: chr17-38319057;