1-42929884-C-T

Variant names:

• chr1-42929884-C-T
• rs397514564
• NM_006516.4:c.668G>A

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 5P and 2B. PM1 PM5 PP2 BP4_Moderate

The NM_006516.4(SLC2A1):​c.668G>A​(p.Arg223Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000248 in 1,613,998 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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. R223P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: SLC2A1 NM_006516.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:11
• Conservation: PhyloP100: 4.74
• Publications: 7 publications found

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]

SLC2A1 Gene-Disease associations (from GenCC):

• encephalopathy due to GLUT1 deficiency

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
• GLUT1 deficiency syndrome

  Inheritance: SD, AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, ClinGen
• childhood onset GLUT1 deficiency syndrome 2

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• dystonia 9

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• epilepsy, idiopathic generalized, susceptibility to, 12

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• childhood absence epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary cryohydrocytosis with reduced stomatin

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• myoclonic-astatic epilepsy

  Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_006516.4
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-42929885-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 207193.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the SLC2A1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 98 curated pathogenic missense variants (we use a threshold of 10). The gene has 7 curated benign missense variants. Gene score misZ: 2.9256 (below the threshold of 3.09). Trascript score misZ: 4.6729 (above the threshold of 3.09). GenCC associations: The gene is linked to epilepsy, idiopathic generalized, susceptibility to, 12, GLUT1 deficiency syndrome, encephalopathy due to GLUT1 deficiency, dystonia 9, hereditary cryohydrocytosis with reduced stomatin, childhood onset GLUT1 deficiency syndrome 2, childhood absence epilepsy, myoclonic-astatic epilepsy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.12553158).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006516.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC2A1	NM_006516.4	MANE Select	c.668G>A	p.Arg223Gln	missense	Exon 5 of 10	NP_006507.2	P11166

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC2A1	ENST00000426263.10	TSL:1 MANE Select	c.668G>A	p.Arg223Gln	missense	Exon 5 of 10	ENSP00000416293.2	P11166
	SLC2A1	ENST00000889577.1		c.665G>A	p.Arg222Gln	missense	Exon 5 of 10	ENSP00000559636.1
	SLC2A1	ENST00000958848.1		c.668G>A	p.Arg223Gln	missense	Exon 5 of 10	ENSP00000628907.1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152110 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000208

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000119 AC: 3 AN: 251438 AF XY: 0.0000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000246 AC: 36 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.0000261 AC XY: 19 AN XY: 727246

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.0000756 AC: 3 AN: 39700

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.000173 AC: 1 AN: 5768

European-Non Finnish (NFE) AF: 0.0000261 AC: 29 AN: 1112008

Other (OTH) AF: 0.0000166 AC: 1 AN: 60396

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152110 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74308

African (AFR) AF: 0.00 AC: 0 AN: 41400

American (AMR) AF: 0.0000655 AC: 1 AN: 15278

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3466

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.000208 AC: 1 AN: 4816

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68026

Other (OTH) AF: 0.00 AC: 0 AN: 2088

Alfa AF: 0.0000675 Hom.: 0

Bravo AF: 0.0000604

ExAC AF: 0.0000165 AC: 2

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Dystonia 9 (2)
-	2	-	Encephalopathy due to GLUT1 deficiency (2)
-	2	-	not provided (2)
-	1	-	Childhood onset GLUT1 deficiency syndrome 2 (1)
-	1	-	Epilepsy, idiopathic generalized, susceptibility to, 12 (1)
-	1	-	GLUT1 deficiency syndrome 1, autosomal recessive (1)
-	1	-	Hereditary cryohydrocytosis with reduced stomatin (1)
-	1	-	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	T
Eigen	Benign	-0.35
Eigen_PC	Benign	-0.12
FATHMM_MKL	Benign	0.57	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
PhyloP100		4.7
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	0.56	N
REVEL	Benign	0.10
Sift	Benign	0.25	T
Sift4G	Benign	0.34	T
Polyphen		0.0060	B
Vest4		0.20
MVP		0.58
MPC		1.1
ClinPred		0.30	T
GERP RS		3.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.15
gMVP		0.19
Mutation Taster		=74/26	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs397514564; hg19: chr1-43395555; COSMIC: COSV65288693; COSMIC: COSV65288693;