FBP1 Gene

FBP1 Gene — Fructose-1,6-bisphosphatase 1

Overview

Fbp1 Gene plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

FBP1 Gene — Fructose-1,6-bisphosphatase 1

Overview

Fbp1 Gene plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">Fructose-1,6-bisphosphatase 1</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>FBP1</td></tr>
<tr><td><strong>Full Name</strong></td><td>Fructose-1,6-bisphosphatase 1</td></tr>
<tr><td><strong>Chromosome</strong></td><td>9q22.33</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[2203](https://www.ncbi.nlm.nih.gov/gene/2203)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[229700](https://www.omim.org/entry/229700)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000165140</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P09467](https://www.uniprot.org/uniprot/P09467)</td></tr>
<tr><td><strong>Protein Class</strong></td><td>Metabolic enzyme</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Fructose-1,6-bisphosphatase Deficiency, Hepatic Glycogen Storage Disease</td></tr>
</table>
</div>

Introduction

The FBP1 gene encodes fructose-1,6-bisphosphatase 1 (FBPase-1), a key gluconeogenic enzyme that catalyzes the hydrolysis of fructose-1,6-bisphosphate to fructose-6-phosphate[@hers1982]. This reaction represents a rate-limiting step in gluconeogenesis, the metabolic pathway by which glucose is synthesized from non-carbohydrate precursors[@pilkis1995]. While primarily expressed in the liver and kidney, FBP1 also exhibits tumor suppressor functions in various cancers and may play roles in metabolic regulation in the brain[@dong2011].

Gene Structure and Organization

The FBP1 gene is located on chromosome 9q22.33 and spans approximately 22 kb of genomic DNA[@ncbi]. The gene contains 7 exons encoding a 337-amino acid protein with a molecular weight of ~37 kDa. The enzyme exists as a homotetramer, with each subunit containing:

• N-terminal domain: Substrate binding site
• C-terminal domain: Catalytic site
• Allosteric regulation site: Binds AMP for inhibition

Expression Pattern

FBP1 is primarily expressed in:

• Liver: Highest expression in hepatocytes
• Kidney: Cortical and medullary tubular cells
• Intestine: Lower expression in enterocytes
• Other tissues: Very low expression in brain, muscle, and heart

Protein Function and Molecular Mechanisms

Gluconeogenesis

FBP1 catalyzes the following reaction[@gidhjain1998]:

Fructose-1,6-bisphosphate + H2O → Fructose-6-phosphate + Pi

This reaction is irreversible and represents one of three key regulatory points in gluconeogenesis:

Metabolic Regulation

FBP1 plays several important metabolic roles[@yun2015]:

• Blood glucose maintenance: Essential for fasting glucose homeostasis
• Energy balance: Coordinates carbohydrate metabolism
• AMP-activated signaling: Integrates cellular energy status

Tumor Suppressor Function

Beyond gluconeogenesis, FBP1 functions as a tumor suppressor[@li2015]:

• Warburg effect inhibition: Counteracts aerobic glycolysis in cancer cells
• Gene expression regulation: Modulates histone acetylation
• Metabolic reprogramming: Forces cancer cells toward oxidative phosphorylation

Role in Neurodegeneration

Metabolic Dysfunction in Neurodegeneration

While FBP1 deficiency primarily affects liver and kidney function, metabolic dysregulation is increasingly recognized in neurodegenerative diseases[@cai2020]:

• Alzheimer's disease: Brain glucose hypometabolism is an early hallmark
• [Parkinson's disease](/diseases/parkinsons-disease): Impaired mitochondrial metabolism in dopaminergic [neurons](/entities/neurons)
• Huntington's disease: Altered energy metabolism in neurons

FBP1 in Brain Metabolism

The role of FBP1 in brain metabolism is limited under normal conditions, but[@pfelffer2018]:

• Astrocyte metabolism: May contribute to astrocytic gluconeogenesis
• Glycogen breakdown: Links to brain glycogen metabolism
• Stress response: Upregulated under metabolic stress

Implications for Therapy

Understanding FBP1 function provides insights into[@mattson2019]:

• Metabolic therapies: Targeting brain energy metabolism
• Ketogenic diets: Alternative energy sources for neurons
• Diabetes-neurodegeneration link: Shared metabolic mechanisms

Disease Associations

Fructose-1,6-bisphosphatase Deficiency (FBPase Deficiency)

This rare autosomal recessive disorder is characterized by[@fromenty2017]:

| Feature | Description |
|---------|-------------|
| Onset | Infancy or early childhood |
| Symptoms | Hypoglycemia, lactic acidosis, hyperventilation |
| Treatment | Dietary management, frequent feeds |
| Prognosis | Good with appropriate management |

Cancer

Loss of FBP1 expression is observed in various cancers[@chen2014]:

• Hepatocellular carcinoma
• Renal cell carcinoma
• Breast cancer
• Lung cancer

Summary

The FBP1 gene encodes fructose-1,6-bisphosphatase 1, a key gluconeogenic enzyme that catalyzes the hydrolysis of fructose-1,6-bisphosphate to fructose-6-phosphate. This enzyme plays essential roles in glucose homeostasis, particularly in liver and kidney. FBP1 also functions as a tumor suppressor in various cancers. While its direct role in neurodegeneration is limited, metabolic dysregulation is a key feature of neurodegenerative diseases, and understanding FBP1 function provides insights into broader metabolic mechanisms relevant to brain health.

See Also

• [FBP1 Protein](/proteins/fbp1-protein)
• [Gluconeogenesis](/mechanisms/gluconeogenesis)
• [Metabolic Disorders](/diseases/metabolic-disorders)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Glucose Metabolism in Brain](/mechanisms/brain-glucose-metabolism)

Overview

Fbp1 Gene plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Background

The study of Fbp1 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

• [NCBI Gene: FBP1](https://www.ncbi.nlm.nih.gov/gene/2203)
• [UniProt: P09467](https://www.uniprot.org/uniprot/P09467)
• [OMIM: 229700](https://www.omim.org/entry/229700)
• [KEGG: Gluconeogenesis pathway](https://www.kegg.jp/kegg-bin/show_pathway?map=eco00010&objects=FBP1)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving FBP1 Gene discovered through SciDEX knowledge graph analysis: