Genetic Variant ST8SIA5:p.Asp186Asn (chr18-46686187-C-T) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong

The NM_013305.6(ST8SIA5):c.556G>A(p.Asp186Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,461,860 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000082 ( 1 hom. )

Consequence

ST8SIA5
NM_013305.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.45

Variant links:

Genes affected

ST8SIA5 (HGNC:17827): (ST8 alpha-N-acetyl-neuraminide alpha-2,8-sialyltransferase 5) The protein encoded by this gene is a type II membrane protein that may be present in the Golgi apparatus. The encoded protein, which is a member of glycosyltransferase family 29, may be involved in the synthesis of gangliosides GD1c, GT1a, GQ1b, and GT3 from GD1a, GT1b, GM1b, and GD3, respectively. [provided by RefSeq, Jul 2008]

ST8SIA5 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.954

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ST8SIA5	NM_013305.6 link	c.556G>A	p.Asp186Asn	missense_variant	Exon 5 of 7	ENST00000315087.12	NP_037437.2	O15466-1
ST8SIA5	NM_001307986.2 link	c.664G>A	p.Asp222Asn	missense_variant	Exon 6 of 8		NP_001294915.1	O15466-2
ST8SIA5	NM_001307987.2 link	c.463G>A	p.Asp155Asn	missense_variant	Exon 4 of 6		NP_001294916.1	O15466F5H8D1B7Z5F7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ST8SIA5	ENST00000315087.12 link	c.556G>A	p.Asp186Asn	missense_variant	Exon 5 of 7	1	NM_013305.6	ENSP00000321343.6		O15466-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251480

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135918

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000821

AC:

AN:

1461860

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727234

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.00000719

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000178

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 17, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.556G>A (p.D186N) alteration is located in exon 5 (coding exon 5) of the ST8SIA5 gene. This alteration results from a G to A substitution at nucleotide position 556, causing the aspartic acid (D) at amino acid position 186 to be replaced by an asparagine (N). 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

0.20

BayesDel_addAF

Benign

-0.090

BayesDel_noAF

Benign

-0.26

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.26

.;T;T

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.89

D;D;D

M_CAP

Benign

0.077

MetaRNN

Pathogenic

0.95

D;D;D

MetaSVM

Uncertain

-0.25

MutationAssessor

Uncertain

2.7

.;M;.

PrimateAI

Uncertain

0.72

PROVEAN

Uncertain

-3.6

D;D;D

REVEL

Uncertain

0.45

Sift

Benign

0.080

T;T;T

Sift4G

Uncertain

0.032

D;D;D

Polyphen

1.0, 1.0

.;D;D

Vest4

0.95

MutPred

0.84

Loss of stability (P = 0.0642);.;.;

MVP

0.76

MPC

1.3

ClinPred

0.98

GERP RS

5.5

Varity_R

0.44

gMVP

0.81

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