Glycoprotein Storage Disease (Glycoproteinoses/Oligosaccharidoses): Disease Characteristics Research Report

Target disease name used in request: “Glycoprotein Storage Disease” (Mendelian).

Executive summary (current understanding)

In current clinical-biochemical usage, “glycoprotein storage diseases” most closely corresponds to the lysosomal glycoproteinoses/oligosaccharidoses: inherited disorders caused by deficiency of lysosomal hydrolases (or related trafficking factors) needed for glycoprotein/oligosaccharide catabolism, leading to lysosomal accumulation and characteristic urinary oligosacchariduria/glyco‑conjugate biomarkers. This group includes (among others) aspartylglucosaminuria (AGA), fucosidosis (FUCA1), α‑mannosidosis (MAN2B1), sialidosis (NEU1), galactosialidosis (CTSA) and mucolipidosis II/III (GNPTAB/GNPTG), as enumerated in a recent pathway-oriented lysosomal disorder mapping table (makridou2025mappinglysosomalstorage pages 13-14, makridou2025mappinglysosomalstorage media 116d92e3, makridou2025mappinglysosomalstorage media 684000a4).

A modern classification example: mucolipidoses types I–III are classified as glycoproteinoses, while mucolipidosis IV is classified separately as a gangliosidosis (gorbunova2024lysosomalstoragediseases. pages 1-3). A broader mechanistic framework classifies these conditions as “enzymatic hydrolytic defects” within lysosomal storage disorders (LSDs) (makridou2025mappinglysosomalstorage pages 2-4).

Evidence type key

• Human clinical: case series, cohorts, and case reports.
• Clinical trials/real-world access: ClinicalTrials.gov records.
• Reviews/expert synthesis: narrative/systematic reviews.
• Model systems: iPSC/cellular or animal-model papers.

1. Disease information

1.1 What is the disease?

Because “glycoprotein storage disease” is not consistently used as a single OMIM entity, the most defensible approach for a knowledge base entry is to treat it as a disease family (glycoproteinoses/oligosaccharidoses) within LSDs.

• Definitional framing (expert synthesis): glycoproteinoses are treated as lysosomal disorders caused by deficiency of specific lysosomal hydrolases (or cofactors), preventing macromolecule degradation and producing lysosomal accumulation of partially degraded substrates (makridou2025mappinglysosomalstorage pages 2-4).
• Clinical classification statement (mucolipidosis within glycoproteinoses): mucolipidoses are presented as autosomal-recessive LSDs with storage of multiple macromolecules; “types I–III mucolipidoses are classified as glycoproteinoses” in “modern classification” (gorbunova2024lysosomalstoragediseases. pages 1-3).

1.2 Key identifiers (availability in retrieved evidence)

The retrieved evidence strongly supports subtype-level identifiers, but does not provide MONDO IDs.

Subtype-level identifiers explicitly present: - Aspartylglucosaminuria (AGU): OMIM #208400 (kouhashi2024a37yearoldman pages 1-2) - Fucosidosis: OMIM #230000 is mentioned in a related recent case report abstract (not central here) (pekdemir2025fucosidosisareview pages 15-16) - Galactosialidosis: OMIM #256540 (makridou2025mappinglysosomalstorage pages 10-12) - Mucolipidosis II (ML II): MIM #252500 (monteagudovilavedra2025novelphenotypicaland pages 1-2)

Note: ICD/MeSH/Orphanet/MONDO identifiers were not extractable from the retrieved texts in this run; therefore, they cannot be asserted with tool-backed evidence.

1.3 Synonyms and alternative names

• Family-level: glycoproteinoses / oligosaccharidoses (used in diagnostic context as a group causing “oligosacchariduria”) (kouhashi2024a37yearoldman pages 4-5, serrano2024hepatomegalyandsplenomegaly pages 5-7)
• Fucosidosis historical synonym: “mucopolysaccharidosis F” (pekdemir2025fucosidosisareview pages 2-4)
• Sialidosis type I synonym: “cherry-red spot myoclonus syndrome” (ding2024twocasesof pages 1-2)
• Mucolipidosis II synonym: “I-cell disease” (moutinho2025establishmentofa pages 1-2)

1.4 Evidence sources: patient-level vs aggregated

The current evidence is primarily aggregated disease-level resources (reviews, cohort studies) with some patient-level case reports (e.g., AGU adult diagnostic odyssey) (kouhashi2024a37yearoldman pages 1-2).

2. Etiology

2.1 Disease causal factors

Primary cause: germline pathogenic variants causing loss of function or impaired trafficking of lysosomal proteins involved in glycoprotein/oligosaccharide catabolism (makridou2025mappinglysosomalstorage pages 2-4).

Representative causal gene–enzyme relationships (visual table evidence): - AGA → aspartylglucosaminidase → AGU - FUCA1 → α‑L‑fucosidase → fucosidosis - MAN2B1 → lysosomal α‑mannosidase → α‑mannosidosis - NEU1 → neuraminidase‑1 → sialidosis - CTSA → protective protein/cathepsin A → galactosialidosis (makridou2025mappinglysosomalstorage media 116d92e3, makridou2025mappinglysosomalstorage media 684000a4)

2.2 Risk factors

For Mendelian LSDs, the main “risk factors” are genetic: - Autosomal recessive inheritance for the above disorders is repeatedly stated (e.g., fucosidosis and α‑mannosidosis) (bhattacherjee2023genotypefirstapproach pages 1-3, ficicioglu2024alphamannosidosis pages 1-3). - Consanguinity/founder effects can strongly increase local prevalence (e.g., fucosidosis in Cuba/Holguín with founder mutation Q427X) (chang2024epidemiologicalandpopulation pages 1-3).

2.3 Protective factors / gene–environment interactions

No evidence in retrieved texts supports environmental protective factors or gene–environment interactions for this disease family.

3. Phenotypes (human)

Because this is a disease family, phenotypes are best represented by common cross-cutting manifestations plus subtype-specific high-yield features.

3.1 Cross-cutting phenotypic domains

• Neurodevelopmental/neurodegenerative: developmental delay, progressive deterioration, seizures, ataxia, spasticity (multiple disorders) (ding2024twocasesof pages 1-2, pekdemir2025fucosidosisareview pages 7-9, kouhashi2024a37yearoldman pages 1-2).
• Skeletal/dysostosis multiplex and coarse facies: prominent in mucolipidosis II/III and fucosidosis; also reported in α‑mannosidosis (feng2024clinicalandmolecular pages 1-2, pekdemir2025fucosidosisareview pages 7-9, marins2024αmannosidosisdiagnosisin pages 1-2).
• Organomegaly and hepatosplenomegaly: part of the differential approach to LSD-related hepatosplenomegaly, including glycoproteinoses (serrano2024hepatomegalyandsplenomegaly pages 3-5, serrano2024hepatomegalyandsplenomegaly pages 2-3).

3.2 Subtype phenotype statistics (recent data)

Sialidosis type I (NEU1): pooled 71 cases up to 2023

A 2024 Orphanet Journal of Rare Diseases review pooled 71 genetically confirmed type I cases (69 literature + 2 new) (ding2024twocasesof pages 4-6). - Mean onset age 15.7 years (range 5–33); mean diagnosis age 24.1 years (range 8–51) (ding2024twocasesof pages 4-6). - Most frequent features: muscle spasms 91.5%, ataxia 75%, seizures 63.6% (ding2024twocasesof pages 4-6, ding2024twocasesof pages 1-2). - Additional reported frequencies: visual symptoms 66.2%, intellectual impairment 22.9% (11/48), abnormal EEG 50.0% (30/60), brain MRI abnormalities 41.4% (24/58) (ding2024twocasesof pages 8-9).

Suggested HPO terms (non-exhaustive): - Myoclonus / muscle spasms (e.g., HP:0001336), ataxia (HP:0001251), seizures (HP:0001250), cherry-red spot of the macula (HP:0012047), visual impairment (HP:0000505).

Mucolipidosis II/III (GNPTAB/GNPTG): phenotype and survival

• Chinese cohort (20 probands): common manifestations included joint stiffness, skeletal deformity, intellectual disability, short stature, and elevated plasma lysosomal enzymes with normal urinary GAGs (feng2024clinicalandmolecular pages 1-2).
• Pediatric cohort (n=19) reported median survival in ML II α/β of 28 months, “mainly due to respiratory failure” (erdem2025mucolipidosistypeii pages 1-2).

Suggested HPO terms: joint contractures (HP:0001374), gingival hypertrophy (HP:0000212), dysostosis multiplex (HP:0000943), cardiomyopathy/valve disease (HP:0001638).

Alpha-mannosidosis (MAN2B1)

Phenotypic core includes hearing loss, recurrent infections/immunodeficiency, skeletal abnormalities, developmental delay/intellectual disability, ataxia, hypotonia, psychiatric features, and variable disease severity (ficicioglu2024alphamannosidosis pages 1-3, hashmi2024exomesequenceanalysis pages 1-2).

Suggested HPO terms: hearing impairment (HP:0000365), immunodeficiency (HP:0002721), intellectual disability (HP:0001249), ataxia (HP:0001251).

Fucosidosis (FUCA1)

Clinical spectrum includes type I (early, severe) and type II (later, milder) with neurodegeneration, coarse facies, angiokeratomas, organomegaly and dysostosis multiplex (pekdemir2025fucosidosisareview pages 7-9, pekdemir2025fucosidosisareview pages 15-16).

Suggested HPO terms: coarse facies (HP:0000280), angiokeratoma (HP:0001025), hepatosplenomegaly (HP:0001433), seizures (HP:0001250).

Aspartylglucosaminuria (AGA)

An adult diagnostic-odyssey case emphasized developmental delay and later regression with epilepsy and coarse facies; it states: “Such a developmental delay is often observed as the first neurologic sign of aspartylglucosaminuria (AGU)” and notes characteristic diarrhea (kouhashi2024a37yearoldman pages 1-2).

4. Genetic / molecular information

4.1 Causal genes (core set supported by visual evidence)

The hydrolytic-defect table explicitly lists glycoprotein storage diseases and corresponding genes (makridou2025mappinglysosomalstorage media 116d92e3, makridou2025mappinglysosomalstorage media 684000a4): - AGA (AGU), FUCA1 (fucosidosis), MAN2B1 (α‑mannosidosis), NEU1 (sialidosis), CTSA (galactosialidosis).

Mucolipidosis II/III (trafficking defect; still classed among glycoproteinoses in modern classification): - GNPTAB (ML II; ML III α/β) and GNPTG (ML III γ) (gorbunova2024lysosomalstoragediseases. pages 1-3, feng2024clinicalandmolecular pages 1-2).

4.2 Pathogenic variants and variant classes (examples)

• AGU (AGA): homozygous donor splice-site variant c.698+1G>T identified by trio-WES (kouhashi2024a37yearoldman pages 1-2).
• α‑mannosidosis (MAN2B1): nonsense p.Ser899Ter in Brazilian families (marins2024αmannosidosisdiagnosisin pages 1-2); frameshift c.2402dupG (p.S802fs*129) reported in Saudi families (hashmi2024exomesequenceanalysis pages 1-2).
• ML II/III (GNPTAB): in one cohort, mutations found in 35/40 alleles (87.5%), with frequent variants c.2715+1G>A (14.3%) and c.2404C>T (p.Gln802Ter) (11.4%) and multiple novel variants (feng2024clinicalandmolecular pages 1-2).
• Fucosidosis (FUCA1): ClinVar catalog referenced as 160 variants with 23 pathogenic and 125 VUS (bhattacherjee2023genotypefirstapproach pages 1-3); HGMD catalog referenced as 36 biallelic pathogenic variants with multiple variant classes (pekdemir2025fucosidosisareview pages 9-10).

4.3 Functional consequences (mechanistic anchors)

• Sialidosis: NEU1 is a lysosomal enzyme hydrolyzing terminal sialic acid residues; loss causes accumulation of sialylated compounds (peng2025geneticinsightsand pages 1-2).
• ML II: failure to generate mannose‑6‑phosphate targeting leads to mis‑trafficking and secretion of lysosomal hydrolases, causing lysosomal substrate accumulation (moutinho2025establishmentofa pages 1-2).

4.4 Modifier genes / epigenetics / chromosomal abnormalities

No tool-retrieved evidence supported modifier genes or epigenetic mechanisms for this disease family.

5. Environmental information

No non-genetic environmental causal factors were supported by retrieved evidence; these are primarily Mendelian disorders.

6. Mechanism / pathophysiology

6.1 Causal chain (general)

1) Biallelic pathogenic variants in a lysosomal enzyme gene (e.g., NEU1, AGA, FUCA1, MAN2B1) or trafficking gene (GNPTAB/GNPTG) → 2) Reduced/absent enzyme activity or mis-targeting → 3) Accumulation of undegraded glycoprotein/oligosaccharide substrates in lysosomes and often in urine (oligosacchariduria) → 4) Secondary lysosomal dysfunction, multi-system tissue injury, and (in many subtypes) progressive CNS involvement (makridou2025mappinglysosomalstorage pages 2-4, kouhashi2024a37yearoldman pages 4-5).

6.2 CNS disease and the blood–brain barrier (BBB) as a central therapeutic constraint (expert opinions)

A 2023 Molecular Therapy review explicitly states: “neither enzymes, stem cells, nor viral vectors efficiently cross the blood–brain barrier” (critchley2023targetingthecentral pages 1-2). This frames why systemic ERT often fails to address neurodegeneration in many glycoproteinoses.

Mechanistic/therapeutic implications: - HSCT/HSC gene therapy can provide CNS benefit via engraftment and enzyme cross-correction (critchley2023targetingthecentral pages 8-9, critchley2023targetingthecentral pages 11-12). - rAAV approaches can be delivered systemically or directly into CSF/brain; higher systemic dosing may increase CNS exposure but raises toxicity risk (critchley2023targetingthecentral pages 9-11).

Suggested GO/CL terms (cross-cutting): - GO BP: lysosomal catabolic process; glycoprotein catabolic process; lysosomal enzyme targeting. - GO CC: lysosome; lysosomal lumen. - CL: microglial cell; neuron; oligodendrocyte.

7. Anatomical structures affected

Across the glycoproteinoses, affected structures frequently include: - CNS / brain (developmental delay, regression, seizures, ataxia) (pekdemir2025fucosidosisareview pages 7-9, ding2024twocasesof pages 4-6). - Retina/macula (sialidosis/galactosialidosis: cherry‑red spot) (ding2024twocasesof pages 1-2, gorbunova2024lysosomalstoragediseases. pages 1-3). - Skeletal system (dysostosis multiplex, joint stiffness/contractures; particularly ML II/III) (feng2024clinicalandmolecular pages 1-2, erdem2025mucolipidosistypeii pages 2-3). - Liver/spleen (hepatosplenomegaly and lysosomal-disease differential) (serrano2024hepatomegalyandsplenomegaly pages 2-3).

Suggested UBERON terms (examples): brain; retina; liver; spleen; skeleton.

8. Temporal development

• Sialidosis type I: typically later-onset in adolescence/young adulthood; pooled mean onset 15.7 years and diagnosis 24.1 years (ding2024twocasesof pages 4-6).
• ML II α/β: typically presents in the first year; severe course with markedly reduced survival (median 28 months in one cohort) (erdem2025mucolipidosistypeii pages 1-2).
• AGU: early developmental delay (around 12–15 months) is described as a typical first neurologic sign, with later progressive course (kouhashi2024a37yearoldman pages 4-5).

9. Inheritance and population

9.1 LSD overall incidence statistic (context)

A 2024 hepatosplenomegaly-focused review states LSDs have an “approximate collective incidence of 1 in 5000 live births” (serrano2024hepatomegalyandsplenomegaly pages 1-2).

9.2 Fucosidosis population genetics and founder effects (recent 2024 data)

A Cuban case-series/population-genetics study (1985–2023) reported: - 19 diagnosed patients in 13 families. - Case fatality 0.84 and parental consanguinity 0.53. - Estimated heterozygous carrier genotype frequency 0.0113887, interpreted as ~11,660 carriers in Holguín province. - High local prevalence attributed to founder effect and isolation (chang2024epidemiologicalandpopulation pages 1-3).

9.3 Newborn screening (AGU example)

The AGU diagnostic-odyssey paper notes: “AGU is included in newborn screening in Finland” (kouhashi2024a37yearoldman pages 5-6).

10. Diagnostics

10.1 Recommended diagnostic strategy (expert guidance for LSDs)

In the context of hepatosplenomegaly, a 2024 review states molecular testing is preferred as confirmatory testing “(over biopsy)” and should be paired with enzymatic testing when feasible (serrano2024hepatomegalyandsplenomegaly pages 1-2). It also emphasizes that some assays still require fibroblasts, e.g., neuraminidase in sialidosis/galactosialidosis (serrano2024hepatomegalyandsplenomegaly pages 7-8).

10.2 Key tests for glycoproteinoses/oligosaccharidoses (examples)

• Urine oligosaccharide/glyco‑conjugate screening: AGU paper recommends urinary analysis by UHPLC/HRAM MS to “screen for oligosaccharidoses” (kouhashi2024a37yearoldman pages 4-5).
• Subtype-specific enzyme assays: e.g., α‑L‑fucosidase deficiency in fucosidosis (bhattacherjee2023genotypefirstapproach pages 1-3, pekdemir2025fucosidosisareview pages 9-10), α‑mannosidase deficiency in α‑mannosidosis (marins2024αmannosidosisdiagnosisin pages 1-2), neuraminidase deficiency in sialidosis (peng2025geneticinsightsand pages 1-2).
• Genetic testing: trio-WES for undiagnosed intellectual disability with regression/epilepsy is presented as powerful (kouhashi2024a37yearoldman pages 1-2).

10.3 Quantitative biomarker example (AGU)

The AGU case report documents urinary elevation: “increased excretion of undegraded aspartyl-glucosamine (208 mmol/mol creatinine)” (kouhashi2024a37yearoldman pages 2-4).

11. Outcome / prognosis

• ML II α/β: poor survival (median 28 months in one cohort) (erdem2025mucolipidosistypeii pages 1-2); a separate review notes median survival ~5 years (monteagudovilavedra2025novelphenotypicaland pages 2-4).
• Fucosidosis: type I has early severe course with death often in childhood; type II has slower progression and can reach adulthood (pekdemir2025fucosidosisareview pages 7-9, pekdemir2025fucosidosisareview pages 15-16).
• Sialidosis type I: later-onset; progressive movement disorder with substantial disability, and later stages often requiring wheelchair use per review narrative (ding2024twocasesof pages 8-9).

For α‑mannosidosis, HSCT series summary in an authoritative clinical resource: “overall survival rate was 88%” in a reported set of 17 transplanted individuals with median follow-up 5.5 years (ficicioglu2024alphamannosidosis pages 12-14).

12. Treatment

12.1 Approved / real-world implementations (alpha-mannosidosis)

• Velmanase alfa (Lamzede®/Lamazym) is described as standard therapy for non-CNS manifestations in α‑mannosidosis (ficicioglu2024alphamannosidosis pages 12-14).
• ClinicalTrials.gov Phase 3 record (rhLAMAN-05; NCT01681953) provides trial design and endpoints: weekly IV 1 mg/kg; co‑primary endpoints included serum oligosaccharide reduction and change in 3‑minute stair climb test (NCT01681953 chunk 1).
• Expanded access program is available (NCT04959240), with updates through 2023-09-25 and language indicating access “prior to local regulatory approval” (NCT04959240 chunk 1).
• A real-world pediatric (<3 years) pharmacodynamic study is recruiting (NCT06184503) using GlcNAc(Man)2 as a disease marker and incorporating registry/compassionate-use data sources (NCT06184503 chunk 1).

MAXO suggestions: enzyme replacement therapy; expanded access/compassionate use; hematopoietic stem cell transplantation.

12.2 HSCT (alpha-mannosidosis and broader LSD context)

HSCT is cited as potentially preserving neurocognitive function in α‑mannosidosis and is supported by survival data (ficicioglu2024alphamannosidosis pages 12-14). For CNS LSDs, HSCT/HSC gene therapy is discussed mechanistically as enabling microglia-like engraftment and enzyme cross-correction (critchley2023targetingthecentral pages 8-9, critchley2023targetingthecentral pages 11-12).

12.3 Experimental/early-stage gene therapy (AGU)

A planned intrathecal AAV gene therapy trial: - NCT07530796 (ClinicalTrials.gov; sponsor Rare Trait Hope) is an open-label Phase 1/2 trial of Danagalex (scAAV9/AGA) intrathecal single-dose gene therapy; NOT_YET_RECRUITING with estimated start 2026-05-01; primary endpoint safety through Day 720; secondary endpoints include change in glycoasparagine biomarker and AGA activity, and NIH Toolbox Motor Function outcomes (NCT07530796 chunk 1).

12.4 Supportive care (core across glycoproteinoses)

• Sialidosis type I: antiseizure medication is used but may not prevent recurrent seizures (ding2024twocasesof pages 4-6).
• Fucosidosis: supportive multidisciplinary care; disease-modifying approaches remain investigational (pekdemir2025fucosidosisareview pages 15-16).

13. Prevention

For Mendelian glycoproteinoses, prevention is largely genetic/public-health: - Newborn screening: AGU is included in Finland newborn screening (kouhashi2024a37yearoldman pages 5-6). - Genetic counseling: emphasized in diagnostic reviews and in subtype reports (e.g., sialidosis review emphasizes NEU1 guidance for counseling/prenatal diagnosis) (ding2024twocasesof pages 1-2).

14. Other species / natural disease

No tool-retrieved evidence in this run addressed naturally occurring veterinary glycoproteinoses.

15. Model organisms / model systems

Evidence for model systems is strongest for mucolipidosis II: - A 2025 paper reports a GNPTAB-mutant ML II iPSC line recapitulating key hallmarks (reduced intracellular M6P-dependent hydrolase activity with increased secretion; free cholesterol accumulation), explicitly positioned as a resource for mechanistic and therapeutic studies (moutinho2025establishmentofa pages 1-2).

Suggested model-relevant ontology: - CL: fibroblast; iPSC; neuron (for derived models).

Visual evidence: subtype-to-gene mapping

Makridou et al. provide a table segment listing key glycoproteinoses and causal genes (CTSA, NEU1, FUCA1, AGA, MAN2B1), supporting the disease-family mapping requested (makridou2025mappinglysosomalstorage media 116d92e3, makridou2025mappinglysosomalstorage media 684000a4).

Structured summary table (for knowledge base ingestion)

Table: This table summarizes the main glycoprotein storage diseases discussed in the evidence base, aligning subtype names, causal genes, biomarkers, phenotypes, diagnostics, treatments, and concise ontology suggestions. It is useful as a compact disease-knowledge-base scaffold for comparing the major glycoproteinoses/oligosaccharidoses.

Key limitations of this evidence package

• MONDO / Orphanet / ICD / MeSH identifiers for the umbrella term “glycoprotein storage disease” were not present in the retrieved sources; thus, they cannot be asserted with tool-backed citations.
• Many sources retrieved are 2025 (still recent and relevant), but the report prioritizes 2023–2024 where available (e.g., Ding 2024; Serrano 2024; Marins 2024; Kouhashi 2024; Critchley 2023).

References

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19. (feng2024clinicalandmolecular pages 1-2): Yuyu Feng, Yonglan Huang, Xiaoyuan Zhao, Huiying Sheng, Xueying Su, Xi Yin, Liu Li, and Wen Zhang. Clinical and molecular characteristics of 20 chinese probands with mucolipidosis type ii and iii alpha/beta. BMC Pediatrics, Dec 2024. URL: https://doi.org/10.1186/s12887-024-05223-x, doi:10.1186/s12887-024-05223-x. This article has 2 citations and is from a peer-reviewed journal.

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24. (ding2024twocasesof pages 8-9): Yuan Ding, Ming Cheng, and Chunxiu Gong. Two cases of type i sialidosis and a literature review. Orphanet Journal of Rare Diseases, Nov 2024. URL: https://doi.org/10.1186/s13023-024-03431-3, doi:10.1186/s13023-024-03431-3. This article has 8 citations and is from a peer-reviewed journal.

25. (erdem2025mucolipidosistypeii pages 1-2): Fehime Erdem, Ebru Canda, Havva Yazıcı, Rabia Eser, Merve Yoldaş Çelik, Selcan Keşan, Merve Saka Güvenç, Tahir Atik, İpek Tamsel, Hüseyin Onay, Sema Kalkan Uçar, Eser Yıldırım Sözmen, and Mahmut Çoker. Mucolipidosis type ii and iii: clinical spectrum, genetic landscape, and longitudinal outcomes in a pediatric cohort with six novel mutations. Journal of Pediatric Endocrinology and Metabolism, 38(12):1286-1298, Oct 2025. URL: https://doi.org/10.1515/jpem-2025-0352, doi:10.1515/jpem-2025-0352. This article has 1 citations and is from a peer-reviewed journal.

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