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SPR Gene

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gene759 wordssynced 2026-04-02

SPR Gene

Introduction

Spr Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene"> [@blau2003]

| Attribute | Value | [@friedman2011]
|-----------|-------| [@tachida2020]
| Gene Symbol | SPR | [@werner2021]
| Gene Name | Sepiapterin Reductase |
| Official Full Name | Sepiapterin Reductase (7,8-dihydrobiopterin:NADP+ oxidoreductase) |
| Chromosomal Location | 2p14 |
| GRCh38 Coordinates | chr2:73,016,252-73,029,687 |
| NCBI Gene ID | 6717 |
| OMIM ID | 182125 |
| Ensembl ID | ENSG00000166347 |
| UniProt ID | P35270 |
| Gene Family | Short-chain dehydrogenases/reductases (SDR) |

</div>}

Overview

The SPR gene encodes Sepiapterin Reductase (SPR), the final enzyme in the tetrahydrobiopterin (BH4) biosynthesis pathway.<sup>[1]</sup> BH4 is an essential cofactor for aromatic amino acid hydroxylases (phenylalanine hydroxylase, tyrosine hydroxylase, tryptophan hydroxylase) and nitric oxide synthases. SPR deficiency causes a rare neurological disorder characterized by dopa-responsive dystonia and neurological deterioration.

Function

Tetrahydrobiopterin Biosynthesis

SPR catalyzes the final step in BH4 synthesis:

GTP → 7,8-dihydroneopterin triphosphate → 6-pyruvoyl tetrahydropterin → 6,7,8-trihydropterin → tetrahydrobiopterin (BH4)

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