1-42927224-G-T

Position:

• chr1-42927224-G-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_006516.4(SLC2A1):​c.1296C>A​(p.Tyr432Ter) variant causes a stop gained change involving the alteration of a non-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 Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Y432Y) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC2A1 NM_006516.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: -1.77

Genes affected

SLC2A1 (HGNC:11005): (solute carrier family 2 member 1) This gene encodes a major glucose transporter in the mammalian blood-brain barrier. The encoded protein is found primarily in the cell membrane and on the cell surface, where it can also function as a receptor for human T-cell leukemia virus (HTLV) I and II. Mutations in this gene have been found in a family with paroxysmal exertion-induced dyskinesia. [provided by RefSeq, Apr 2013]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.124 CDS is truncated, and there are 1 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-42927224-G-T is Pathogenic according to our data. Variant chr1-42927224-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 193689.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-42927224-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC2A1	NM_006516.4	c.1296C>A	p.Tyr432Ter	stop_gained	10/10	ENST00000426263.10	NP_006507.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC2A1	ENST00000426263.10	c.1296C>A	p.Tyr432Ter	stop_gained	10/10	1	NM_006516.4	ENSP00000416293	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Encephalopathy due to GLUT1 deficiency Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Apr 11, 2023

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jan 02, 2015

- -

GLUT1 deficiency syndrome 1, autosomal recessive Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 29, 2022

This premature translational stop signal has been observed in individual(s) with GLUT1 deficiency syndrome 1 (PMID: 29303961). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Tyr432*) in the SLC2A1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 61 amino acid(s) of the SLC2A1 protein. ClinVar contains an entry for this variant (Variation ID: 193689). For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the SLC2A1 protein in which other variant(s) (p.Arg458Trp) have been determined to be pathogenic (PMID: 23280796, 23340081, 28116237). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.36
CADD	Uncertain	24
DANN	Benign	0.96
Eigen	Benign	-0.71
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.54	D
MutationTaster	Benign	1.0	D
Vest4		0.90
GERP RS		-10

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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

Other links and lift over

dbSNP: rs75485205; hg19: chr1-43392895;