20-23492998-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_005492.4(CST8):c.272C>T(p.Ala91Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000226 in 1,612,598 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00015 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00023 ( 0 hom. )

Consequence

CST8
NM_005492.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.404

Variant links:

Genes affected

CST8 (HGNC:2480): (cystatin 8) The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins and the kininogens. The type 2 cystatin proteins are a class of cysteine proteinase inhibitors found in a variety of human fluids and secretions. The cystatin locus on chromosome 20 contains the majority of the type 2 cystatin genes and pseudogenes. This gene is located in the cystatin locus and encodes a protein similar to type 2 cystatins. The encoded protein exhibits highly tissue-specific expression in the reproductive tract, suggesting implicit roles in reproduction. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2013]

CST8 links:

ENSG00000260202 (HGNC:):

ENSG00000260202 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.114278734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CST8	NM_005492.4 link	c.272C>T	p.Ala91Val	missense_variant	Exon 3 of 4	ENST00000246012.2	NP_005483.1	O60676A0A384MDQ4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CST8	ENST00000246012.2 link	c.272C>T	p.Ala91Val	missense_variant	Exon 3 of 4	1	NM_005492.4	ENSP00000246012.1	O60676
CST8	ENST00000449810.5 link	c.272C>T	p.Ala91Val	missense_variant	Exon 3 of 4	3		ENSP00000399144.1	A2A2N0
ENSG00000260202	ENST00000619495.1 link	n.439-11235G>A		intron_variant	Intron 1 of 1	4

Frequencies

GnomAD3 genomes

AF:

0.000151

AC:

AN:

151896

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000484

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000309

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000151

AC:

AN:

251388

Hom.:

AF XY:

0.000155

AC XY:

AN XY:

135856

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000463

Gnomad NFE exome

AF:

0.000264

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000234

AC:

342

AN:

1460586

Hom.:

Cov.:

AF XY:

0.000245

AC XY:

178

AN XY:

726688

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000295

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.000151

AC:

AN:

152012

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74272

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000309

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.000144

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000157

AC:

EpiCase

AF:

0.000382

EpiControl

AF:

0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 27, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.272C>T (p.A91V) alteration is located in exon 3 (coding exon 2) of the CST8 gene. This alteration results from a C to T substitution at nucleotide position 272, causing the alanine (A) at amino acid position 91 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

0.25

BayesDel_addAF

Benign

-0.35

BayesDel_noAF

Benign

-0.43

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.18

.;T

Eigen

Benign

-0.19

Eigen_PC

Benign

-0.21

FATHMM_MKL

Benign

0.41

LIST_S2

Benign

0.54

T;T

M_CAP

Benign

0.0051

MetaRNN

Benign

0.11

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.4

.;M

PrimateAI

Benign

0.37

PROVEAN

Uncertain

-3.0

D;D

REVEL

Benign

0.11

Sift

Uncertain

0.0090

D;D

Sift4G

Uncertain

0.023

D;D

Polyphen

0.77

.;P

Vest4

0.38

MVP

0.22

MPC

0.0027

ClinPred

0.13

GERP RS

3.4

Varity_R

0.18

gMVP

0.51

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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