X-48904676-C-T

Variant names:

• chrX-48904676-C-T
• ENST00000445167.7:c.643G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_005660.3(SLC35A2):​c.1163+70G>A variant causes a intron 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: SLC35A2 NM_005660.3 intron
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.690
• 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.053225666).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC35A2	NM_005660.3	c.1163+70G>A		intron_variant	Intron 4 of 4	ENST00000247138.11	NP_005651.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC35A2	ENST00000247138.11	c.1163+70G>A		intron_variant	Intron 4 of 4	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

See cases Uncertain:1

Jul 15, 2020

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PM2, BP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.86
CADD	Benign	8.9
DANN	Benign	0.79
FATHMM_MKL	Benign	0.094	N
LIST_S2	Benign	0.38	T;T
M_CAP	Benign	0.0030	T
MetaRNN	Benign	0.053	T;T
MetaSVM	Benign	-1.1	T
PhyloP100		-0.69
PROVEAN	Benign	-0.29	N;N
REVEL	Benign	0.033
Sift	Benign	0.16	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0	B;.
Vest4		0.11
MutPred		0.14		Loss of sheet (P = 0.1158);.;
MVP		0.043
ClinPred		0.031	T
GERP RS		0.94
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=96/4	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

hg19: chrX-48761953;