3-98788387-G-T

Position:

• chr3-98788387-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001323368.2(ST3GAL6):​c.680G>T​(p.Arg227Leu) variant causes a missense change. 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R227Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ST3GAL6 NM_001323368.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.18

Genes affected

ST3GAL6 (HGNC:18080): (ST3 beta-galactoside alpha-2,3-sialyltransferase 6) The protein encoded by this gene is a member of the sialyltransferase family. Members of this family are enzymes that transfer sialic acid from the activated cytidine 5'-monophospho-N-acetylneuraminic acid to terminal positions on sialylated glycolipids (gangliosides) or to the N- or O-linked sugar chains of glycoproteins. This protein has high specificity for neolactotetraosylceramide and neolactohexaosylceramide as glycolipid substrates and may contribute to the formation of selectin ligands and sialyl Lewis X, a carbohydrate important for cell-to-cell recognition and a blood group antigen. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.812

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ST3GAL6	NM_001323368.2	c.680G>T	p.Arg227Leu	missense_variant	8/10	ENST00000483910.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ST3GAL6	ENST00000483910.6	c.680G>T	p.Arg227Leu	missense_variant	8/10	1	NM_001323368.2	P1

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

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 03, 2024

The c.680G>T (p.R227L) alteration is located in exon 9 (coding exon 7) of the ST3GAL6 gene. This alteration results from a G to T substitution at nucleotide position 680, causing the arginine (R) at amino acid position 227 to be replaced by a leucine (L). 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	0.95
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	.;T;T;T;.;.;T;T
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	D;.;D;D;D;D;D;D
M_CAP	Benign	0.023	T
MetaRNN	Pathogenic	0.81	D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.94	T
MutationAssessor	Uncertain	2.1	.;M;.;M;.;.;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.45	T
PROVEAN	Pathogenic	-6.4	D;D;D;D;.;D;D;D
REVEL	Benign	0.26
Sift	Pathogenic	0.0	D;D;D;D;.;D;D;D
Sift4G	Uncertain	0.0040	D;D;D;D;D;D;D;D
Polyphen		0.11, 1.0	.;B;.;B;.;.;D;.
Vest4		0.80
MutPred		0.73		.;Gain of methylation at K222 (P = 0.0677);Gain of methylation at K222 (P = 0.0677);Gain of methylation at K222 (P = 0.0677);.;.;.;.;
MVP		0.37
MPC		0.86
ClinPred		1.0	D
GERP RS		4.0
Varity_R		0.86
gMVP		0.86

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: chr3-98507231;