Affinage

GSS

Glutathione synthetase · UniProt P48637

Length
474 aa
Mass
52.4 kDa
Annotated
2026-06-10
52 papers in source corpus 9 papers cited in narrative 9 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 5/5 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

GSS encodes glutathione synthetase, the enzyme that supports glutathione (GSH) biosynthesis and thereby anchors cellular defense against oxidative stress; its loss diverts the gamma-glutamyl cycle toward 5-oxoproline accumulation and produces the clinical phenotype of glutathione synthetase deficiency (PMID:38114454, PMID:29340523). In humans GSS resides at a single locus on chromosome 20q11.2, and compound heterozygous splice, frameshift, missense, and intragenic-deletion mutations abolish enzyme activity, eliminate detectable GSS protein, and elevate urinary or amniotic 5-oxoproline, establishing GSS as the causative gene for this disorder (PMID:8825653, PMID:14635114, PMID:29340523, PMID:39221916). Because GSS output sustains GSH-dependent antioxidant capacity, its loss drives ferroptosis: in germ cell-specific knockout spermatocytes, depletion of GSH causes ROS and lipid peroxidation, with age-dependent failure of compensatory GPX4 and rising ALOX15 triggering ferroptotic male infertility that GSH or ferrostatin-1 rescues (PMID:38114454). GSS expression is set transcriptionally by the CNC-bZIP factor Nrf1 and epigenetically by age-related promoter DNA methylation in bone marrow mesenchymal stem cells, which limits GSH synthesis independently of cysteine availability and impairs osteoblast differentiation (PMID:10601325, PMID:41674552). Upstream, RRM2 directly regulates GSS to control GSH levels and ferroptosis sensitivity, an RRM2/GSS/GPX4 axis operative in hepatocellular carcinoma and hypertrophic scar fibroblasts (PMID:41619824, PMID:40303288).

Mechanistic history

Synthesis pass · year-by-year structured walk · 8 steps
  1. 1995 High

    Defined the genomic basis of GSS by showing a single human gene at a fixed chromosomal location, establishing that one locus accounts for glutathione synthetase activity.

    Evidence Somatic cell hybrid analysis, in situ hybridization, and Southern blot mapping to 20q11.2

    PMID:8825653

    Open questions at the time
    • Does not address enzyme mechanism or regulation
    • No functional assay of the gene product
  2. 1999 Medium

    Identified an upstream transcriptional control point, showing that GSS expression and cellular glutathione levels depend on the CNC-bZIP factor Nrf1.

    Evidence Glutathione quantification and gene expression analysis in Nrf1 knockout mouse fibroblasts

    PMID:10601325

    Open questions at the time
    • Direct promoter binding by Nrf1 not demonstrated
    • Single lab; not confirmed in human cells
  3. 2003 Medium

    Resolved a molecular mechanism of disease by showing that splice (not exonic) mutations abolish GSS protein and enzyme activity in deficiency patients.

    Evidence RT-PCR mRNA sequencing, enzyme activity assay, and immunodetection in patient fibroblasts

    PMID:14635114

    Open questions at the time
    • Limited mutation spectrum
    • No structural basis for activity loss
  4. 2018 Low

    Extended the mutation spectrum, confirming novel frameshift and insertion alleles as causes of severe deficiency with 5-oxoprolinuria.

    Evidence DNA sequencing, urine 5-oxoproline, and clinical biochemistry in a patient

    PMID:29340523

    Open questions at the time
    • No functional reconstitution or enzyme activity data
    • Single patient
  5. 2023 High

    Placed GSS in a ferroptosis pathway in vivo, showing GSH output protects spermatocytes and that its loss causes age-dependent ferroptotic infertility.

    Evidence Germ cell-specific (Stra8-Cre) conditional knockout with ROS/lipid peroxidation, GPX4/ALOX15 quantification, and GSH/ferrostatin-1 rescue

    PMID:38114454

    Open questions at the time
    • Mechanism of age-dependent GPX4 decline not defined
    • Relevance to human male infertility untested
  6. 2024 Medium

    Provided molecular evidence for variant pathogenicity by demonstrating NMD-mediated monoallelic expression and gamma-glutamyl cycle disruption in affected fetuses.

    Evidence Genome sequencing, RNA-seq, amniotic 5-oxoproline measurement, and NMD analysis

    PMID:39221916

    Open questions at the time
    • Single family
    • No direct enzyme activity measurement
  7. 2025 Medium

    Identified RRM2 as a direct upstream regulator of GSS controlling GSH synthesis and ferroptosis resistance across cancer and fibrotic contexts.

    Evidence RRM2 knockdown/overexpression with GSS, GSH, GPX4, and lipid peroxidation readouts in vitro and in vivo (hepatocellular carcinoma xenograft and rabbit ear scar models); ceRNA HCG18/miR-30a-5p analysis

    PMID:40303288 PMID:41619824

    Open questions at the time
    • Mechanism by which RRM2 regulates GSS transcription not defined
    • Single lab per context
  8. 2026 Medium

    Established an epigenetic control point, showing age-related GSS promoter methylation limits GSH synthesis and osteogenic capacity independent of substrate supply.

    Evidence Promoter methylation analysis, GSH flux assay with cysteine negative control, and CXCR4-exosome GSH delivery in aged bone in vivo

    PMID:41674552

    Open questions at the time
    • Methyltransferase responsible not identified
    • Single lab

Open questions

Synthesis pass · forward-looking unresolved questions
  • How GSS transcriptional, epigenetic, and RRM2-dependent regulatory inputs are integrated, and the structural basis of enzyme activity loss in disease mutants, remain unresolved.
  • No structural model of human GSS or its mutants in the corpus
  • Direct promoter occupancy by Nrf1 and RRM2-GSS regulatory mechanism undefined
  • Human disease ferroptosis link not directly tested

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0016740 transferase activity 1 GO:0016874 ligase activity 1
Pathway
R-HSA-1430728 Metabolism 2 R-HSA-5357801 Programmed Cell Death 2

Evidence

Reading pass · 9 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
1999 Nrf1 (CNC-bZIP transcription factor) regulates GSS gene expression; fibroblasts from Nrf1 knockout mice showed lower levels of glutathione and reduced GSS expression, indicating Nrf1 is required for transcriptional activation of GSS. Nrf1 knockout mouse fibroblasts; glutathione quantification; gene expression analysis The Journal of biological chemistry Medium 10601325
1995 The human glutathione synthetase gene (GSS) maps to a single locus on chromosome 20q11.2, established by somatic cell hybrid analysis and in situ hybridization; Southern blot evidence indicates a single GSS gene in the human genome. Somatic cell hybrid analysis; in situ hybridization; Southern blot Genomics High 8825653
2003 GSS splice mutations (not exonic mutations) account for glutathione synthetase deficiency in patients with undetectable GSS protein and severely decreased enzyme activity, as revealed by RT-PCR sequence analysis of mRNA. RT-PCR mRNA sequencing; enzyme activity assay in fibroblast lysates; polyclonal antibody-based immunodetection Human mutation Medium 14635114
2023 GSS (glutathione synthetase) in pachytene spermatocytes is required for resistance to oxidative stress during spermatogenesis; germ cell-specific Gss knockout causes age-dependent male infertility via ferroptosis, with accumulation of ROS and lipid peroxidation. Young knockout mice are protected by compensatory GPX4 upregulation, which declines with age alongside ALOX15 increase, triggering ferroptosis; meiosis disruption and acrosome heterotopia result, and these defects are rescued by GSH or ferrostatin-1 (Fer-1) treatment. Conditional knockout mouse (Stra8-Cre); fertility assays; ROS and lipid peroxidation measurement; GPX4/ALOX15 protein quantification; GSH and Fer-1 rescue experiments; histology Cell death & disease High 38114454
2018 Two novel compound heterozygous mutations in the GSS gene (c.738dupG in exon 8 causing frameshift p.S247fs, and a repetitive sequence insertion in exon 3) cause severe glutathione synthetase deficiency with markedly elevated urinary 5-oxoproline, confirming GSS as the causative gene for this phenotype. DNA sequence analysis; urine 5-oxoproline measurement; clinical biochemical assays Brazilian journal of medical and biological research Low 29340523
2024 Two fetal siblings with compound heterozygous GSS variants (missense p.Arg267Gln and a 2.4 kb intragenic deletion causing out-of-frame exon 3 skipping) exhibited elevated amniotic 5-oxoproline consistent with disruption of the gamma-glutamyl cycle, and RNA-seq on brain tissue confirmed near-monoallelic expression with NMD-mediated degradation of the deletion allele. Genome sequencing; RNA-seq; amniotic fluid 5-oxoproline measurement; NMD analysis Clinical genetics Medium 39221916
2026 Age-related DNA methylation of the GSS promoter in bone marrow mesenchymal stem cells (BMSCs) suppresses GSS expression, limiting glutathione synthesis and impairing osteoblast differentiation independently of substrate (cysteine) availability; exosome-mediated GSH delivery to bone rescues osteogenic capacity, mitochondrial function, and reduces cellular senescence in aged bone. DNA methylation analysis; GSS promoter methylation; GSH synthesis flux assay; cysteine supplementation (negative control); CXCR4-exosome GSH delivery; in vivo bone formation assays Bioactive materials Medium 41674552
2025 RRM2 directly regulates GSS expression; in hypertrophic scar fibroblasts, metformin downregulates RRM2, which suppresses GSS and thereby impairs glutathione synthesis, indirectly reducing GPX4 and triggering ferroptosis. This RRM2/GSS/GPX4 axis was validated in vitro and in a rabbit ear model. RRM2 knockdown/overexpression; GSS protein and mRNA quantification; GSH and GPX4 measurement; lipid peroxidation assays; in vivo rabbit ear hypertrophic scar model Free radical biology & medicine Medium 41619824
2025 RRM2 directly regulates GSS to increase GSH synthesis in hepatocellular carcinoma cells; lncRNA HCG18 competitively binds miR-30a-5p to upregulate RRM2, which in turn elevates GSS expression and GSH levels, conferring ferroptosis resistance. Co-expression and ceRNA analysis; overexpression/knockdown of HCG18, miR-30a-5p, RRM2; GSS protein quantification; GSH measurement; colony formation and in vivo xenograft assays International journal of biological sciences Medium 40303288

Source papers

Stage 0 corpus · 52 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
1999 The CNC basic leucine zipper factor, Nrf1, is essential for cell survival in response to oxidative stress-inducing agents. Role for Nrf1 in gamma-gcs(l) and gss expression in mouse fibroblasts. The Journal of biological chemistry 156 10601325
2005 Immunodetection of disease-associated mutant PrP, which accelerates disease in GSS transgenic mice. The EMBO journal 124 15962001
2000 A synthetic peptide initiates Gerstmann-Sträussler-Scheinker (GSS) disease in transgenic mice. Journal of molecular biology 115 10656806
2011 Upregulation of micro RNA-146a (miRNA-146a), a marker for inflammatory neurodegeneration, in sporadic Creutzfeldt-Jakob disease (sCJD) and Gerstmann-Straussler-Scheinker (GSS) syndrome. Journal of toxicology and environmental health. Part A 88 22043907
2021 Ammonium Ferric Citrate induced Ferroptosis in Non-Small-Cell Lung Carcinoma through the inhibition of GPX4-GSS/GSR-GGT axis activity. International journal of medical sciences 58 33746607
2007 Human tau protein forms complex with PrP and some GSS- and fCJD-related PrP mutants possess stronger binding activities with tau in vitro. Molecular and cellular biochemistry 57 18038270
2023 Gss deficiency causes age-related fertility impairment via ROS-triggered ferroptosis in the testes of mice. Cell death & disease 42 38114454
2003 Channels formed with a mutant prion protein PrP(82-146) homologous to a 7-kDa fragment in diseased brain of GSS patients. American journal of physiology. Cell physiology 42 12814912
2019 Targeting FAT1 Inhibits Carcinogenesis, Induces Oxidative Stress and Enhances Cisplatin Sensitivity through Deregulation of LRP5/WNT2/GSS Signaling Axis in Oral Squamous Cell Carcinoma. Cancers 35 31783581
2022 Regulatory mechanism of α-hederin upon cisplatin sensibility in NSCLC at safe dose by destroying GSS/GSH/GPX2 axis-mediated glutathione oxidation-reduction system. Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie 34 35398749
2010 The first case of protease-sensitive prionopathy (PSPr) in The Netherlands: a patient with an unusual GSS-like clinical phenotype. Journal of neurology, neurosurgery, and psychiatry 34 20547632
2017 Derivatives of Bst-like Gss-polymerase with improved processivity and inhibitor tolerance. Nucleic acids research 33 28934494
1991 The transmissible amyloidoses: genetical control of spontaneous generation of infectious amyloid proteins by nucleation of configurational change in host precursors: kuru-CJD-GSS-scrapie-BSE. European journal of epidemiology 32 1684758
2015 Transmission Properties of Human PrP 102L Prions Challenge the Relevance of Mouse Models of GSS. PLoS pathogens 25 26135918
1995 The gene encoding human glutathione synthetase (GSS) maps to the long arm of chromosome 20 at band 11.2. Genomics 24 8825653
2007 Preliminary study on the receptor of gonad-stimulating substance (GSS) as a gonadotropin of starfish. General and comparative endocrinology 23 17368456
2012 Substitutions at residue 211 in the prion protein drive a switch between CJD and GSS syndrome, a new mechanism governing inherited neurodegenerative disorders. Human molecular genetics 22 22965875
2018 A novel Gerstmann-Sträussler-Scheinker disease mutation defines a precursor for amyloidogenic 8 kDa PrP fragments and reveals N-terminal structural changes shared by other GSS alleles. PLoS pathogens 21 29338055
2013 Identification of miRNA encoded by Jatropha curcas from EST and GSS. Plant signaling & behavior 20 23299511
2011 Participation of Gs-proteins in the action of relaxin-like gonad-stimulating substance (GSS) for 1-methyladenine production in starfish ovarian follicle cells. General and comparative endocrinology 18 22134181
2020 Spontaneous generation of prions and transmissible PrP amyloid in a humanised transgenic mouse model of A117V GSS. PLoS biology 17 32516343
2003 Diagnostics in patients with glutathione synthetase deficiency but without mutations in the exons of the GSS gene. Human mutation 17 14635114
2019 Suppressive Effects of GSS on Lipopolysaccharide-Induced Endothelial Cell Injury and ALI via TNF-α and IL-6. Mediators of inflammation 16 32082076
2011 Hormonal action of relaxin-like gonad-stimulating substance (GSS) on starfish ovaries in growing and fully grown states. General and comparative endocrinology 16 21295575
2010 A Drosophila model of GSS syndrome suggests defects in active zones are responsible for pathogenesis of GSS syndrome. Human molecular genetics 16 20829230
2018 A case of severe glutathione synthetase deficiency with novel GSS mutations. Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas 13 29340523
2008 ReRep: computational detection of repetitive sequences in genome survey sequences (GSS). BMC bioinformatics 12 18782453
2011 Autophagy contributes to widespread neuronal degeneration in hamsters infected with the Echigo-1 strain of Creutzfeldt-Jakob disease and mice infected with the Fujisaki strain of Gerstmann-Sträussler-Scheinker (GSS) syndrome. Ultrastructural pathology 11 21214405
1995 High-resolution physical mapping of a 250-kb region of human chromosome 11q24 by genomic sequence sampling (GSS). Genomics 11 7607672
1991 [Recent advances in the research of Creutzfeldt-Jakob disease (CJD) and Gerstmann-Strüssler syndrome (GSS)]. Rinsho shinkeigaku = Clinical neurology 10 1687809
2012 Characterization of HMW-GSs and their gene inaction in tetraploid wheat. Genetica 9 23054223
2025 Targeting HCG18 counteracts ferroptosis resistance via blocking the miR-30a-5p/RRM2/GSS pathway in hepatocellular carcinoma. International journal of biological sciences 8 40303288
2019 "Dual Disease" TgAD/GSS mice exhibit enhanced Alzheimer's disease pathology and reveal PrPC-dependent secretion of Aβ. Scientific reports 8 31189938
2001 [A case of Gerstmann-Sträussler-Scheinker syndrome (GSS) with late onset--a haplotype analysis of Glu219Lys polymorphism in PrP gene]. Rinsho shinkeigaku = Clinical neurology 7 11771163
2022 Effects of HMW-GSs at Glu-B1 locus on starch-protein interaction and starch digestibility during thermomechanical processing of wheat dough. Journal of the science of food and agriculture 6 36397183
2019 A case of Gerstmann-Straussler-Scheinker (GSS) disease with supranuclear gaze palsy. Journal of clinical movement disorders 6 31890235
2019 Analysis of microRNAs and their targets from onion (Allium cepa) using genome survey sequences (GSS) and expressed sequence tags (ESTs). Bioinformation 6 32256010
2016 Genotypic susceptibility score (GSS) and CD4+ T cell recovery in HIV-1 patients with suppressed viral load. The Journal of antimicrobial chemotherapy 5 27999069
2024 Dynamic behaviors of protein and water associated with fresh noodle quality during processing based on different HMW-GSs at Glu-D1. Food chemistry 4 38754351
1991 Absence of 1-Methyladenine Production in Follicle Cells Obtained from Starfish Ovaries in the Post-Spawning Season: (starfish follicle celis/1-MeAde/GSS/cAMP/post-spawning season). Development, growth & differentiation 4 37281473
2024 HMW-GSs 1Dx3+1Dy12 contribute to a suitable wheat gluten strength that confers superior Chinese steamed bread quality. Journal of food science 3 38193206
2014 Improved therapy-success prediction with GSS estimated from clinical HIV-1 sequences. Journal of the International AIDS Society 3 25397488
2008 [Case of Gerstmann-Sträussler-Scheinker syndrome (GSS-P102L) mimicking variant Creurtzfeldt-Jakob disease in clinical manifestation and MRI findings]. Rinsho shinkeigaku = Clinical neurology 3 18409537
2006 [Patient with Gerstmann-Striussler-Scheinker syndrome (GSS P102L) presenting high intensity lesions in the cerebral cortex on diffusion weighted MRI]. Rinsho shinkeigaku = Clinical neurology 3 16768100
2011 Design studies for ASIC implementations of 28 GS/s optical QPSK- and 16-QAM-OFDM transceivers. Optics express 2 21997095
1994 Effect of Ca2+ -free Seawater Treatment on 1-Methyladenine Production in Starfish Ovarian Follicle Cells: (starfish follicle cells/1-MeAde/GSS/cAMP/Ca2 +-free seawater). Development, growth & differentiation 2 37281076
2026 Age-related GSS promoter methylation in BMSCs drives osteoporosis and the reversal by targeted GSH delivery. Bioactive materials 1 41674552
2011 Does GSS still maintain relevance on HAART outcome after the introduction of newest active antiretroviral drugs? 48 weeks results. Current HIV research 1 22211659
2010 Insights from the GC content analysis of 76genome survey sequences (GSS) from Elaeisoleifera. Bioinformation 1 21364775
2026 Metformin targets RRM2/GSS/GPX4 axis to induce fibroblast ferroptosis: A foreground strategy against hypertrophic scarring. Free radical biology & medicine 0 41619824
2024 Multiple congenital anomalies in two fetuses with glutathione-synthetase deficit (GSS). Clinical genetics 0 39221916
1997 [Creutzfeldt-Jakob disease(CJD) and Gerstmann-Sträussler-Scheinker syndrome(GSS)]. Nihon rinsho. Japanese journal of clinical medicine 0 9103904

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