rs193302893

Positions:

• chr11-119027706-A-G

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2 PP3_Moderate PP5_Very_Strong

The NM_001164278.2(SLC37A4):​c.547T>C​(p.Cys183Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,554 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: SLC37A4 NM_001164278.2 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 8.73

Genes affected

SLC37A4 (HGNC:4061): (solute carrier family 37 member 4) This gene regulates glucose-6-phosphate transport from the cytoplasm to the lumen of the endoplasmic reticulum, in order to maintain glucose homeostasis. It also plays a role in ATP-mediated calcium sequestration in the lumen of the endoplasmic reticulum. Mutations in this gene have been associated with various forms of glycogen storage disease. Alternative splicing in this gene results in multiple transcript variants.[provided by RefSeq, Aug 2009]

SLC37A4 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.869
• PP5: Variant 11-119027706-A-G is Pathogenic according to our data. Variant chr11-119027706-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 68284.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-119027706-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC37A4	NM_001164278.2	c.547T>C	p.Cys183Arg	missense_variant	6/12		NP_001157750.1
SLC37A4	NM_001164277.2	c.547T>C	p.Cys183Arg	missense_variant	6/11		NP_001157749.1
SLC37A4	NM_001164280.2	c.547T>C	p.Cys183Arg	missense_variant	4/9		NP_001157752.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC37A4	ENST00000330775.9	c.547T>C	p.Cys183Arg	missense_variant	5/10	5		ENSP00000476242.2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD3 exomes AF: 0.00000415 AC: 1 AN: 240882 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 130680

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000919

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461554 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727042

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Glucose-6-phosphate transport defect Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 19, 2023	ClinVar contains an entry for this variant (Variation ID: 68284). For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects SLC37A4 function (PMID: 12444104, 18835800). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt SLC37A4 protein function. This variant is also known as T716C, c.716T>C. This missense change has been observed in individual(s) with glycogen storage disease (PMID: 10482962, 10518030, 15906092, 16435186). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. This variant is present in population databases (rs193302893, gnomAD 0.0009%). This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 183 of the SLC37A4 protein (p.Cys183Arg). -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 22, 2022	Variant summary: SLC37A4 c.547T>C, legacy nucleotide naming as T716C in exon 3 (p.Cys183Arg) results in a non-conservative amino acid change located in the Major facilitator superfamily domain (IPR020846) of the encoded protein sequence. Two of two in-silico tools predict a damaging effect of the variant on protein function while three in-silico tools did not provide a prediction. The variant allele was found at a frequency of 4.2e-06 in 240882 control chromosomes. c.547T>C has been reported in the literature as a compound heterozygous genotype in multiple individuals affected with Glycogen Storage Disease Type Ib (example, Veiga-da-Cunha_1999, Galli_1999, Hiraiwa_1999, Janecke_2000, Sperb-Ludwig_2019). These data indicate that the variant is very likely to be associated with disease. Multiple publications report experimental evidence evaluating an impact on protein function (example, Hiraiwa_1999, Chen_2002). The most pronounced variant effect results in a complete disruption of microsomal glucose-6-phosphate (G6P) uptake resulting from defective transport. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided Other:1

not provided, no classification provided

literature only

UniProtKB/Swiss-Prot

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.62
CADD	Uncertain	25
DANN	Benign	0.87
DEOGEN2	Uncertain	0.43	T;T;T;T
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.90	.;D;D;D
M_CAP	Benign	0.048	D
MetaRNN	Pathogenic	0.87	D;D;D;D
PrimateAI	Pathogenic	0.81	D
Sift4G	Uncertain	0.0040	D;D;D;D
Vest4		0.99
MVP		0.59
MPC		0.25
GERP RS		5.2
gMVP		0.96

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

Publications

LitVar

Other links and lift over

dbSNP: rs193302893; hg19: chr11-118898416;