18-57357098-C-T

Variant names:

• chr18-57357098-C-T
• NM_015879.3:c.488C>T

Variant summary

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

The NM_015879.3(ST8SIA3):​c.488C>T​(p.Ala163Val) 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: 33)
• Consequence: ST8SIA3 NM_015879.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.55

Genes affected

ST8SIA3 (HGNC:14269): (ST8 alpha-N-acetyl-neuraminide alpha-2,8-sialyltransferase 3) Enables alpha-N-acetylneuraminate alpha-2,8-sialyltransferase activity and identical protein binding activity. Involved in several processes, including ganglioside biosynthetic process; glycoprotein metabolic process; and protein sialylation. Predicted to be located in Golgi membrane. [provided by Alliance of Genome Resources, Apr 2022]

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, 0.935

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ST8SIA3	NM_015879.3	c.488C>T	p.Ala163Val	missense_variant	Exon 3 of 4	ENST00000324000.4	NP_056963.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ST8SIA3	ENST00000324000.4	c.488C>T	p.Ala163Val	missense_variant	Exon 3 of 4	1	NM_015879.3	ENSP00000320431.2
ST8SIA3	ENST00000586360.1	c.-56C>T		upstream_gene_variant		3		ENSP00000467752.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Dec 21, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.488C>T (p.A163V) alteration is located in exon 3 (coding exon 3) of the ST8SIA3 gene. This alteration results from a C to T substitution at nucleotide position 488, causing the alanine (A) at amino acid position 163 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	Pathogenic	0.87
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.23	T
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D
M_CAP	Benign	0.029	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Benign	-0.56	T
MutationAssessor	Benign	2.0	M
PrimateAI	Uncertain	0.68	T
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.46
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0030	D
Polyphen		0.99	D
Vest4		0.83
MutPred		0.89		Gain of sheet (P = 0.0827);
MVP		0.24
MPC		1.3
ClinPred		0.98	D
GERP RS		6.0
Varity_R		0.83
gMVP		0.89

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr18-55024329;