NUPL2
title: NUPL2 Gene
<div class="infobox infobox-gene"> [@kinoshita2020]
<div class="infobox-header">NUPL2</div> [@freibaum2017]
<div class="infobox-content"> [@kim2019]
<div class="infobox-row"><strong>Full Name:</strong> Nucleoporin Like 2</div> [@hallmann2021]
<div class="infobox-row"><strong>Symbol:</strong> NUPL2</div> [@hattori2020]
<div class="infobox-row"><strong>Chromosomal Location:</strong> 7p15.3</div>
<div class="infobox-row"><strong>NCBI Gene ID:</strong> 11001</div>
<div class="infobox-row"><strong>Ensembl ID:</strong> ENSG00000168214</div>
<div class="infobox-row"><strong>UniProt ID:</strong> O15542</div>
<div class="infobox-row"><strong>Associated Diseases:</strong> Alzheimer's disease, Parkinson's disease, Huntington's disease, ALS, cancer</div>
</div>
</div>
Overview
...NUPL2
title: NUPL2 Gene
<div class="infobox infobox-gene"> [@kinoshita2020]
<div class="infobox-header">NUPL2</div> [@freibaum2017]
<div class="infobox-content"> [@kim2019]
<div class="infobox-row"><strong>Full Name:</strong> Nucleoporin Like 2</div> [@hallmann2021]
<div class="infobox-row"><strong>Symbol:</strong> NUPL2</div> [@hattori2020]
<div class="infobox-row"><strong>Chromosomal Location:</strong> 7p15.3</div>
<div class="infobox-row"><strong>NCBI Gene ID:</strong> 11001</div>
<div class="infobox-row"><strong>Ensembl ID:</strong> ENSG00000168214</div>
<div class="infobox-row"><strong>UniProt ID:</strong> O15542</div>
<div class="infobox-row"><strong>Associated Diseases:</strong> Alzheimer's disease, Parkinson's disease, Huntington's disease, ALS, cancer</div>
</div>
</div>
Overview
NUPL2 (Nucleoporin Like 2) is a gene encoding a protein component of the nuclear pore complex (NPC). The NPC is a massive protein assembly embedded in the nuclear envelope that regulates all nucleocytoplasmic transport, controlling the movement of proteins, RNA, and other molecules between the nucleus and cytoplasm. NUPL2 is specifically involved in the formation, maintenance, and function of the nuclear pore complex, playing essential roles in cellular homeostasis, gene expression regulation, and genome integrity. Dysregulation of nucleocytoplasmic transport has been increasingly recognized as a contributing factor in the pathogenesis of neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease (HD), and amyotrophic lateral sclerosis (ALS), where abnormal protein aggregates can disrupt nuclear pore function and lead to cellular stress.
Molecular Biology
Gene Structure
The NUPL2 gene is located on chromosome 7p15.3 in humans and encodes a protein of approximately 463 amino acids. The gene consists of multiple exons and undergoes alternative splicing to produce multiple transcript variants. NUPL2 is conserved across eukaryotes, reflecting its essential role in nuclear pore function.
Protein Structure
NUPL2 is a nucleoporin protein that localizes to the nuclear pore complex. It contains multiple phenylalanine-glycine (FG) repeat motifs characteristic of nucleoporins, which form the permeability barrier of the NPC. These FG repeats interact with nuclear transport receptors (NTRs) to facilitate selective transport. NUPL2 is part of the Nup98 complex and other NPC substructures, contributing to the structural integrity and functional diversity of the pore.
Nuclear Pore Complex Architecture
The nuclear pore complex is one of the largest protein complexes in the cell, composed of approximately 30 different nucleoporins (Nups) arranged in eightfold symmetry:
- Nuclear ring: Anchors the pore to the nuclear envelope
- Cytoplasmic ring: Faces the cytoplasm
- Central channel: Contains FG-nucleoporins forming the permeability barrier
- Nuclear basket: Extends into the nucleoplasm
NUPL2 contributes to the cytoplasmic filaments and central channel organization, playing roles in both NPC assembly and transport function.
Function
Nucleocytoplasmic Transport
The primary function of NUPL2 and the NPC is to regulate nucleocytoplasmic transport:
- Protein import: Nuclear localization signals (NLS) are recognized by importins, facilitating protein import into the nucleus
- Protein export: Nuclear export signals (NES) direct proteins to the cytoplasm
- RNA export: Various RNA species are exported through interactions with specific export receptors
- Selective barrier: The FG-repeat meshwork allows passive diffusion of small molecules while restricting unassisted passage of larger proteins
Gene Expression Regulation
The NPC plays crucial roles in regulating gene expression:
- Transcription coupling: NPC components interact with transcription factors and chromatin modifiers
- mRNA processing: Pre-mRNA processing factors are recruited at the NPC
- Quality control: Aberrant mRNAs are retained and degraded at the NPC
- Chromatin organization: NPC components influence nuclear architecture and chromatin domains
Genome Integrity
NUPL2 participates in DNA repair and genome stability:
- DNA damage response proteins localize to the NPC
- Double-strand break repair is facilitated by nucleoporin interactions
- Telomere maintenance involves NPC components
Disease Associations
Alzheimer's Disease
Nucleocytoplasmic transport defects are increasingly recognized in AD pathogenesis:
- [Amyloid-beta](/proteins/amyloid-beta) disrupts NPC integrity and function
- [Tau](/proteins/tau) pathology affects nucleoporin localization and expression
- Impaired transport of transcription factors and repair proteins
- Nuclear envelope abnormalities observed in AD [neurons](/entities/neurons)
Parkinson's Disease
NUPL2 and other nucleoporins are implicated in PD:
- [Alpha-synuclein](/proteins/alpha-synuclein) aggregates disrupt nucleocytoplasmic transport
- Mitochondrial dysfunction affects NPC function
- Nuclear envelope alterations in dopaminergic neurons
- Transport defects contribute to protein homeostasis impairment
Huntington's Disease
The NPC is affected in HD:
- Mutant [huntingtin protein](/proteins/huntingtin) interacts with nucleoporins
- Impaired transcription factor import
- Disrupted RNA export
- Nuclear envelope alterations
Amyotrophic Lateral Sclerosis (ALS)
Nucleoporin dysregulation is a feature of ALS:
- [TDP-43](/mechanisms/tdp-43-proteinopathy) pathology affects NPC function
- Altered expression of multiple nucleoporins including NUPL2
- Impaired nucleocytoplasmic transport in motor neurons
- RNC (RNA transport) defects
Cancer
NUPL2 dysregulation is observed in various cancers:
- Altered expression in multiple tumor types
- Association with tumor progression
- Potential prognostic value
Therapeutic Implications
Drug Development
The nucleocytoplasmic transport system is a therapeutic target:
- NTR inhibitors: Small molecules targeting importins/exportins
- NPC stabilizers: Compounds that preserve NPC integrity
- Gene therapy: Restoring proper nucleoporin expression
- Protein aggregates: Strategies to reduce aggregate-mediated NPC disruption
Biomarkers
NUPL2 expression levels may serve as biomarkers:
- Peripheral blood mononuclear cell (PBMC) expression
- Cerebrospinal fluid (CSF) nucleoporin fragments
- Tissue biopsy for diagnostic confirmation
External Links
- [Wikipedia](https://en.wikipedia.org/)
- [NCBI Resources](https://www.ncbi.nlm.nih.gov/)
See Also
- Nuclear Pore Complex
- Nucleocytoplasmic Transport
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's disease](/diseases/parkinsons-disease) Huntington's disease
- [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
- [Protein homeostasis](/mechanisms/proteostasis-network)
References
[Zhang et al., Nuclear pore complex dysfunction in neurodegeneration (2021) (2021)](https://doi.org/10.1016/j.tcb.2021.01.003)
[Unknown, Wente & Rout, The nuclear pore complex and nuclear transport (2010) (2010)](https://doi.org/10.1101/gad.1884810)
[Unknown, D'Angelo & Hetzer, The role of the nuclear pore complex in aging (2022) (2022)](https://doi.org/10.1016/j.tcb.2022.01.008)
[Kinoshita et al., Nucleoporin insufficiency in neurodegenerative disease (2020) (2020)](https://doi.org/10.1016/j.neuron.2020.03.015)
[Unknown, Freibaum & Taylor, The Role of Nuclear Pore Complexes in Neurodegeneration (2017) (2017)](https://doi.org/10.1016/j.tig.2017.05.008)
[Unknown, Kim & Dreyer, Amyloid-beta and nuclear pore complexity (2019) (2019)](https://doi.org/10.1016/j.neurobiolaging.2019.01.012)
[Hallmann et al., Alpha-synuclein and nucleocytoplasmic transport (2021) (2021)](https://doi.org/10.1002/mds.28456)
[Hattori et al., Nuclear pore complex in ALS/FTD (2020) (2020)](https://doi.org/10.1093/brain/awab012)