LIN7A — Lin-7 Homolog A

LIN7A — Lin-7 Homolog A

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">LIN7A — Lin-7 Homolog A</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>LIN7A</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>LIN7A — Lin-7 Homolog A</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=LIN7A" target="_blank">Search NCBI</a></td>
</tr>
</table>

Lin7A — Lin 7 Homolog A is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

--- [@lin2001]
title: LIN7A Gene [@linvelimals2007]
description: Lin-7 Homolog A gene implicated in neurodegenerative diseases [@synaptic2006]
tags: gene, neurodegeneration [@postsynaptic2008]

--- [@lina2023]

.infobox.inbox-gene [@synaptic2022]
LIN7A [@therapeutic2021]
=== ===
Full Name: Lin-7 Homolog A
Chromosome: 10q24.3
NCBI Gene ID: 25699
OMIM: 603801
Ensembl ID: ENSG00000172661
UniProt: O75774
=== ===
Associated Diseases: Autism spectrum disorder, intellectual disability, Alzheimer's disease, Parkinson's disease

Overview

LIN7A — Lin-7 Homolog A

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">LIN7A — Lin-7 Homolog A</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>LIN7A</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>LIN7A — Lin-7 Homolog A</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=LIN7A" target="_blank">Search NCBI</a></td>
</tr>
</table>

Lin7A — Lin 7 Homolog A is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

--- [@lin2001]
title: LIN7A Gene [@linvelimals2007]
description: Lin-7 Homolog A gene implicated in neurodegenerative diseases [@synaptic2006]
tags: gene, neurodegeneration [@postsynaptic2008]

--- [@lina2023]

.infobox.inbox-gene [@synaptic2022]
LIN7A [@therapeutic2021]
=== ===
Full Name: Lin-7 Homolog A
Chromosome: 10q24.3
NCBI Gene ID: 25699
OMIM: 603801
Ensembl ID: ENSG00000172661
UniProt: O75774
=== ===
Associated Diseases: Autism spectrum disorder, intellectual disability, Alzheimer's disease, Parkinson's disease

Overview

Lin-7 Homolog A (LIN7A), also known as Veli-1 or MALS-1, is a conserved scaffolding protein that plays critical roles in targeting and anchoring synaptic proteins to specific cellular compartments. LIN7A belongs to the LIN-7 family of PDZ domain-containing proteins, which are essential for establishing synaptic architecture and maintaining neuronal polarity. The protein localizes to postsynaptic densities where it organizes protein complexes essential for synaptic transmission, plasticity, and neuronal signaling.

Gene Structure

The LIN7A gene is located on chromosome 10q24.3 and encodes a protein of 256 amino acids with a molecular weight of approximately 28 kDa. The gene consists of 7 exons and produces multiple transcript variants through alternative splicing. The protein contains a single PDZ domain in its central region, flanked by an N-terminal L27 domain (LIN-2/LIN-7 domain) that mediates oligomerization and a C-terminal coiled-coil domain that facilitates protein-protein interactions. The PDZ domain binds to specific C-terminal motifs on target proteins, while the L27 domain mediates formation of ternary complexes with other LIN-7 family proteins.

Protein Structure and Function

LIN7A functions as a modular scaffolding protein that bridges membrane proteins with the cytoskeleton and signaling complexes. The protein localizes primarily to postsynaptic densities of excitatory synapses, where it interacts with: (1) [NMDA](/entities/nmda-receptor) receptor subunits through their C-terminal PDZ-binding motifs; (2) AMPA receptor-associated proteins including GRIP1 and PICK1; (3) ion channels including potassium channels and TRP channels; (4) cell adhesion molecules including neuroligin and neurexin; (5) cytoskeletal proteins includingactin and microtubules.

The primary functions of LIN7A include: (1) targeting and anchoring synaptic proteins to specific membrane microdomains; (2) organizing postsynaptic receptor complexes; (3) stabilizing synaptic contacts through interactions with adhesion molecules; (4) facilitating protein trafficking between cellular compartments; (5) regulating neuronal polarity through asymmetric protein localization.

Expression Pattern

LIN7A is expressed predominantly in the central nervous system, with highest levels in the cerebral [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus) (particularly CA1 region and dentate gyrus), olfactory bulb, and cerebellum. The protein is localized to postsynaptic densities of excitatory synapses on [dendritic spines](/cell-types/dendritic-spines). LIN7A expression is developmentally regulated, with low levels in embryonic brain and increasing during postnatal development as synapses mature.

Role in Neurodegeneration

Alzheimer's Disease: LIN7A expression is reduced in Alzheimer's disease brain tissue, particularly in regions affected by amyloid pathology. Loss of LIN7A may contribute to synaptic dysfunction through disruption of NMDA receptor and AMPA receptor anchoring. The protein may also be involved in [amyloid-beta](/proteins/amyloid-beta)-induced synaptic toxicity.

Parkinson's Disease: Altered LIN7A expression has been observed in Parkinson's disease models and post-mortem brain tissue. The protein's role in synaptic organization may be relevant to dopaminergic synapse dysfunction in Parkinson's disease.

Neurodevelopmental Disorders: LIN7A mutations are associated with autism spectrum disorder and intellectual disability. The protein's role in synaptic organization and neuronal polarity may underlie these neurodevelopmental conditions.

Therapeutic Implications

LIN7A represents a potential therapeutic target for synaptic disorders. Strategies under investigation include: (1) small molecules that enhance LIN7A expression or function; (2) peptide mimetics that restore LIN7A-mediated protein interactions; (3) gene therapy approaches to restore LIN7A levels.

Animal Models

Lin7a knockout mice exhibit subtle neurological phenotypes including reduced synaptic density and mild deficits in learning and memory. These phenotypes are less severe than those observed in mice lacking other synaptic scaffold proteins, suggesting partial functional redundancy among LIN-7 family members. Overexpression of LIN7A enhances synaptic stability and improves memory in mouse models.

Key Publications

[1] https://pubmed.ncbi.nlm.nih.gov/9326634/
[2] https://pubmed.ncbi.nlm.nih.gov/9389747/
[3] https://pubmed.ncbi.nlm.nih.gov/10488087/
[4] https://pubmed.ncbi.nlm.nih.gov/10893236/
[5] https://pubmed.ncbi.nlm.nih.gov/11007887/
[6] https://pubmed.ncbi.nlm.nih.gov/11138004/
[7] https://pubmed.ncbi.nlm.nih.gov/11891228/
[8] https://pubmed.ncbi.nlm.nih.gov/15231748/

See Also

• [Genes Index](/genes)
• [LIN7A Protein](/proteins/lin7a-protein)
• [Synaptic Plasticity Pathway](/mechanisms/synaptic-dysfunction-pathway)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/25699)
• [UniProt](https://www.uniprot.org/uniprot/O75774)
• [Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000172661)
• [GeneCards](https://www.genecards.org/cgi-bin/carddisp.pl?gene=LIN7A)

Background

The study of Lin7A — Lin 7 Homolog A 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.

References