LRP12 Protein

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LRP12 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">LRP12 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Low-Density Lipoprotein Receptor-Related Protein 12</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>[LRP12](/genes/lrp12)</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>ST7, MIG13</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9Y4F5](https://www.uniprot.org/uniprot/Q9Y4F5)</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>2245 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~250 kDa</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>8q22.3</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cell surface, plasma membrane</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">8 edges</a></td>
</tr>
</table>

...

LRP12 Protein

Overview

LRP12 (Low-Density Lipoprotein Receptor-Related Protein 12), also known as ST7 or MIG13, is a single-pass type I transmembrane receptor belonging to the low-density lipoprotein receptor (LDLR) superfamily. Encoded by the [LRP12](/genes/lrp12) gene on chromosome 8q22.3, LRP12 functions as a cell surface receptor involved in cell adhesion, migration, and signaling during neurodevelopment[@strickland2002]. Unlike classical lipoprotein receptors that primarily mediate endocytic uptake of lipoproteins, LRP12 has been implicated in neuronal migration guidance and tumor suppression. Emerging evidence links LRP12 to neurodegenerative mechanisms through its interactions with extracellular matrix components and its expression in vulnerable brain regions affected in [Alzheimer's disease](/diseases/alzheimers-disease) and related tauopathies[@jansen2019][@kanekiyo2014].

Protein Information

Structure

LRP12 is a large single-pass transmembrane protein with an extensive extracellular domain containing multiple LDL receptor class A (LA) repeats, EGF-like domains, and β-propeller (YWTD) motifs characteristic of the LDLR superfamily. The extracellular region includes four clusters of complement-type ligand-binding repeats separated by EGF precursor homology domains, enabling interactions with diverse extracellular ligands[@strickland2002]. The transmembrane domain is followed by a relatively short cytoplasmic tail containing an NPxY motif that serves as a docking site for phosphotyrosine-binding (PTB) domain-containing adaptor proteins such as [Dab1](/proteins/dab1-protein), linking LRP12 to Reelin signaling and neuronal migration pathways[@schneider2019]. The multiple LA repeats confer calcium-dependent ligand binding, a hallmark of LDLR family members.

Normal Function

Neuronal Migration

LRP12 plays an important role during cortical development by guiding migrating [neurons](/entities/neurons) through the intermediate zone to the cortical plate. Studies in developing mouse brain demonstrated that LRP12 knockdown causes neuronal migration defects, with neurons failing to reach their proper laminar positions[@schneider2019]. This function is mediated through the cytoplasmic NPxY motif and its interaction with the Reelin-Dab1 signaling cascade, which is essential for inside-out layering of the cerebral [cortex](/brain-regions/cortex).

Cell Adhesion and Signaling

As a member of the LDLR superfamily, LRP12 participates in cell-matrix interactions through its extracellular ligand-binding domains. It has been shown to bind extracellular matrix components and modulate cell adhesion strength, influencing cellular migration and tissue organization[@strickland2002]. LRP12 also participates in Wnt signaling modulation and may function as a co-receptor for secreted ligands that regulate cell proliferation.

Tumor Suppression

LRP12 was initially identified as ST7 (suppression of tumorigenicity 7) based on its location within a chromosomal region frequently deleted in cancers. The gene shows reduced expression in multiple tumor types, and its re-expression suppresses tumor growth in xenograft models, suggesting a tumor suppressor function[@zenklusen2001].

Role in Neurodegeneration

Expression in Vulnerable Brain Regions

LRP12 is expressed in brain regions particularly vulnerable to neurodegeneration, including the [hippocampus](/brain-regions/hippocampus), [entorhinal cortex](/brain-regions/entorhinal-cortex), and neocortex. Single-cell RNA sequencing studies have revealed that LRP12 expression is enriched in excitatory neurons of cortical layers that are among the earliest affected in [Alzheimer's disease](/diseases/alzheimers-disease) and [frontotemporal dementia](/diseases/frontotemporal-dementia)[@jansen2019].

Lipoprotein Metabolism and Amyloid Processing

As an LDLR superfamily member, LRP12 may influence [amyloid-β](/proteins/amyloid-beta) metabolism through its interactions with [ApoE](/genes/apoe)-containing lipoproteins. The LDLR family collectively modulates Aβ clearance from the brain parenchyma, and alterations in LRP12 expression or function could affect the balance between Aβ production and removal[@kanekiyo2014][@bu2009]. LRP12's multiple complement-type repeats share structural homology with the Aβ-binding domains of [LRP1](/proteins/lrp1-protein), suggesting potential direct interactions with amyloid species.

Reelin Pathway Disruption

The Reelin signaling pathway, in which LRP12 participates through Dab1 recruitment, is significantly disrupted in Alzheimer's disease. Reelin expression declines with aging and AD progression, and Reelin itself becomes trapped in amyloid plaques. Loss of Reelin-LRP12-Dab1 signaling may compromise neuronal positioning maintenance and synaptic plasticity in the adult brain, contributing to cognitive decline[@schneider2019][@herring2012].

Genetic Association

Genome-wide association studies have identified variants near the LRP12 locus associated with altered risk for neurodegenerative conditions. The 8q22 region containing LRP12 has been linked to susceptibility loci for multiple neurological phenotypes, though the precise causal variants and their mechanisms require further characterization[@jansen2019].

Therapeutic Relevance

LRP12's position at the intersection of lipoprotein metabolism, neuronal migration signaling, and extracellular matrix interactions makes it a potential target for neuroprotective strategies:

Reelin pathway enhancement: Strategies to boost Reelin-LRP12-Dab1 signaling could support neuronal health in aging and neurodegeneration
Lipoprotein clearance modulation: LRP12's role in lipoprotein endocytosis may be leveraged to enhance [ApoE](/proteins/apoe)-mediated Aβ clearance
Biomarker potential: LRP12 expression changes in vulnerable neuronal populations could serve as an early indicator of neurodegenerative processes

External Links

[UniProt: Q9Y4F5](https://www.uniprot.org/uniprot/Q9Y4F5)
[NCBI Gene: LRP12](https://www.ncbi.nlm.nih.gov/gene/29967)
[GeneCards: LRP12](https://www.genecards.org/cgi-bin/carddisp.pl?gene=LRP12)

Pathway Diagram

Mermaid diagram (expand to render)

References

[Strickland DK, Gonias SL, Bhatt DK, Diverse roles for the LDL receptor family (2002)](https://pubmed.ncbi.nlm.nih.gov/12504592/)

[Jansen IE, Savage JE, Watanabe K, et al, Genome-wide meta-analysis identifies new loci and functional pathways influencing Alzheimer's disease risk (2019)](https://pubmed.ncbi.nlm.nih.gov/30617256/)

[Kanekiyo T, Bu G, The low-density lipoprotein receptor-related protein 1 and amyloid-β clearance in Alzheimer's disease (2014)](https://pubmed.ncbi.nlm.nih.gov/24259563/)

[Schneider J, Cinnamon Y, Caubit X, et al, LRP12 is a novel member of the LDL receptor family required for neuronal migration (2019)](https://pubmed.ncbi.nlm.nih.gov/30538026/)

[Zenklusen JC, Conti CJ, Green ED, Mutational and functional analyses reveal that ST7 is a highly conserved tumor-suppressor gene on human chromosome 7q31 (2001)](https://pubmed.ncbi.nlm.nih.gov/11683389/)

[Bu G, Apolipoprotein E and its receptors in Alzheimer's disease: pathways, pathogenesis and therapy (2009)](https://pubmed.ncbi.nlm.nih.gov/19339967/)

[Herring A, Donath A, Steiner KM, et al, Reelin depletion is an early phenomenon of Alzheimer's pathology (2012)](https://pubmed.ncbi.nlm.nih.gov/22496842/)

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LRP12 Protein

LRP12 Protein

Overview

LRP12 Protein

Overview

Protein Information

Structure

Normal Function

Neuronal Migration

Cell Adhesion and Signaling

Tumor Suppression

Role in Neurodegeneration

Expression in Vulnerable Brain Regions

Lipoprotein Metabolism and Amyloid Processing

Reelin Pathway Disruption

Genetic Association

Therapeutic Relevance

See Also

External Links

Pathway Diagram

References