X-48904797-G-T

Variant names:

• chrX-48904797-G-T
• rs782673464
• NM_005660.3:c.1112C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005660.3(SLC35A2):​c.1112C>A​(p.Pro371Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign 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. P371L) has been classified as Benign.

• Frequency: Genomes: not found (cov: 23)
• Consequence: SLC35A2 NM_005660.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.69
• Publications: 0 publications found

Genes affected

SLC35A2 (HGNC:11022): (solute carrier family 35 member A2) This gene encodes a member of the nucleotide-sugar transporter family. The encoded protein is a multi-pass membrane protein. It transports UDP-galactose from the cytosol into Golgi vesicles, where it serves as a glycosyl donor for the generation of glycans. Mutations in this gene cause congenital disorder of glycosylation type IIm (CDG2M). Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Oct 2014]

SLC35A2 Gene-Disease associations (from GenCC):

• SLC35A2-congenital disorder of glycosylation

  Inheritance: XL, Unknown Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Illumina, Orphanet, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• X-linked complex neurodevelopmental disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09435317).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC35A2	NM_005660.3	c.1112C>A	p.Pro371Gln	missense_variant	Exon 4 of 5	ENST00000247138.11	NP_005651.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC35A2	ENST00000247138.11	c.1112C>A	p.Pro371Gln	missense_variant	Exon 4 of 5	1	NM_005660.3	ENSP00000247138.5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jan 30, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.065
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
CADD	Benign	18
DANN	Benign	0.97
DEOGEN2	Benign	0.15	T;.;.;T;.
FATHMM_MKL	Benign	0.20	N
LIST_S2	Benign	0.85	T;T;T;T;T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.094	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.55	N;N;.;.;.
PhyloP100		2.7
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-0.14	N;N;.;.;N
REVEL	Benign	0.045
Sift	Benign	0.13	T;T;.;.;T
Sift4G	Benign	0.074	T;T;D;T;T
Polyphen		0.0	B;B;.;D;.
Vest4		0.32
MutPred		0.15		Loss of glycosylation at P371 (P = 0.0059);Loss of glycosylation at P371 (P = 0.0059);.;.;.;
MVP		0.043
MPC		1.9
ClinPred		0.11	T
GERP RS		1.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.032
gMVP		0.44
Mutation Taster		=93/7	polymorphism

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

Other links and lift over

dbSNP: rs782673464; hg19: chrX-48762074; COSMIC: COSV99504124; COSMIC: COSV99504124;