ENST00000330775.9:c.83G>A

Variant names:

• chr11-119029287-C-T
• rs121908978
• ENST00000330775.9:c.83G>A

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM1 PM5 PP3_Moderate PP5_Very_Strong

The ENST00000330775.9(SLC37A4):​c.83G>A​(p.Arg28His) variant causes a missense change. The variant allele was found at a frequency of 0.0000109 in 1,461,468 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R28C) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: SLC37A4 ENST00000330775.9 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:8 O:1
• Conservation: PhyloP100: 7.12
• Publications: 8 publications found

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 Gene-Disease associations (from GenCC):

• congenital disorder of glycosylation, type IIw

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• glycogen storage disease Ib

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P
• glycogen storage disease type 1 due to SLC37A4 mutation

  Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health

ACMG classification

Our verdict: Pathogenic. The variant received 14 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, 18 uncertain in ENST00000330775.9
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-119029288-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 68291.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.861
• PP5: Variant 11-119029287-C-T is Pathogenic according to our data. Variant chr11-119029287-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 6933.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC37A4	NM_001164278.2	c.83G>A	p.Arg28His	missense_variant	Exon 3 of 12		NP_001157750.1
SLC37A4	NM_001164277.2	c.83G>A	p.Arg28His	missense_variant	Exon 3 of 11		NP_001157749.1
SLC37A4	NM_001164280.2	c.83G>A	p.Arg28His	missense_variant	Exon 1 of 9		NP_001157752.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC37A4	ENST00000330775.9	c.83G>A	p.Arg28His	missense_variant	Exon 2 of 10	5		ENSP00000476242.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000121 AC: 3 AN: 248886 AF XY: 0.0000222

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: 0.00000886

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000109 AC: 16 AN: 1461468 Hom.: 0 Cov.: 31 AF XY: 0.0000124 AC XY: 9 AN XY: 726994

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44698

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86228

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53298

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000135 AC: 15 AN: 1111810

Other (OTH) AF: 0.00 AC: 0 AN: 60362

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Glucose-6-phosphate transport defect Pathogenic:6

Jun 02, 2023

Neuberg Centre For Genomic Medicine, NCGM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The observed missense variant c.83G>A(p.Arg28His) in SLC37A4 gene has been reported previously in multiple individual(s) with Glycogen Storage Disease Ib (Choi R, et al., 2017; Lee KJ, et al., 2016). This variant is present in a mutational hotspot. A different missense variant (c.82C>T, p.Arg28Cys) affecting the same position has been previously reported as a pathogenic variant (Jun HS, et al., 2014). This variant is reported with the allele frequency 0.001% in the gnomAD Exomes. This variant has been reported to the ClinVar database as Pathogenic/Likely Pathogenic by multiple submitters. The amino acid Arg at position 28 is changed to a His changing protein sequence and it might alter its composition and physico-chemical properties. Computational evidence (SIFT – Damaging) predict a damaging effect on protein structure and function for this variant. The residue is conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Pathogenic. -

Mar 25, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 18, 2017

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Sep 22, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Arg28 amino acid residue in SLC37A4. Other variant(s) that disrupt this residue have been observed in individuals with SLC37A4-related conditions (PMID: 10026167, 10518030, 27066451, 28224773), which suggests that this may be a clinically significant amino acid residue. Experimental studies have shown that this missense change affects SLC37A4 function (PMID: 10026167, 12444104, 18337460, 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. ClinVar contains an entry for this variant (Variation ID: 6933). This missense change has been observed in individuals with autosomal recessive glycogen storage disease (PMID: 10026167, 27066451, 28224773). This variant is present in population databases (rs121908978, gnomAD 0.007%). This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 28 of the SLC37A4 protein (p.Arg28His). -

Feb 26, 1999

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Pathogenic:1 Other:1

-

UniProtKB/Swiss-Prot

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Feb 26, 2022

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Glucose-6-phosphate transport defect;C0342749:Phosphate transport defect;C5561986:Congenital disorder of glycosylation, type IIw Pathogenic:1

Nov 10, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	32
DANN	Benign	0.92
DEOGEN2	Uncertain	0.47	T;T;T
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	0.99	.;D;D
M_CAP	Benign	0.066	D
MetaRNN	Pathogenic	0.86	D;D;D
PhyloP100		7.1
Sift4G	Pathogenic	0.0	D;D;D
Vest4		0.90
MVP		0.46
MPC		0.23
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
gMVP		0.94
Mutation Taster		=7/93	disease causing (ClinVar)

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: rs121908978; hg19: chr11-118899997;