Genetic Variant CASC3:p.Ala247Val (chr17-40162856-C-T) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2

The NM_007359.5(CASC3):c.740C>T(p.Ala247Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,830 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

CASC3
NM_007359.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.35

Variant links:

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]

CASC3 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.31473857).

BS2

High AC in GnomAdExome4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASC3	NM_007359.5 link	c.740C>T	p.Ala247Val	missense_variant	Exon 6 of 14	ENST00000264645.12	NP_031385.2
CASC3	XM_005257163.3 link	c.740C>T	p.Ala247Val	missense_variant	Exon 6 of 14		XP_005257220.1	O15234
CASC3	XM_047435623.1 link	c.740C>T	p.Ala247Val	missense_variant	Exon 6 of 9		XP_047291579.1
CASC3	XM_047435624.1 link	c.-179C>T		5_prime_UTR_variant	Exon 7 of 15		XP_047291580.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CASC3	ENST00000264645.12 link	c.740C>T	p.Ala247Val	missense_variant	Exon 6 of 14	1	NM_007359.5	ENSP00000264645.6	O15234
CASC3	ENST00000418132.7 link	n.971C>T		non_coding_transcript_exon_variant	Exon 6 of 8	1
CASC3	ENST00000474190.1 link	n.398C>T		non_coding_transcript_exon_variant	Exon 3 of 6	3		ENSP00000462713.1	J3KSY7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000795

AC:

AN:

251446

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135900

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000410

AC:

AN:

1461830

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727220

show subpopulations

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:

0.0000580

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 25, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.740C>T (p.A247V) alteration is located in exon 6 (coding exon 6) of the CASC3 gene. This alteration results from a C to T substitution at nucleotide position 740, causing the alanine (A) at amino acid position 247 to be replaced by a valine (V). 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

Benign

0.13

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Benign

-0.26

CADD

Pathogenic

DANN

Uncertain

0.98

DEOGEN2

Benign

0.081

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.45

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.93

M_CAP

Benign

0.011

MetaRNN

Benign

0.31

MetaSVM

Benign

-0.86

MutationAssessor

Benign

0.69

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-1.6

REVEL

Benign

0.11

Sift

Uncertain

0.016

Sift4G

Uncertain

0.054

Polyphen

0.91

Vest4

0.52

MutPred

0.31

Gain of sheet (P = 0.0477);

MVP

0.20

MPC

1.6

ClinPred

0.59

GERP RS

5.7

Varity_R

0.36

gMVP

0.25

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over