BRCA1 Protein

BRCA1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">BRCA1 Protein</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Function</td>
</tr>
<tr>
<td class="label">BRCA2 (FANCD1)</td>
<td>Homologous recombination</td>
</tr>
<tr>
<td class="label">PALB2</td>
<td>BRCA2 recruitment</td>
</tr>
<tr>
<td class="label">RAD51</td>
<td>Strand invasion</td>
</tr>
<tr>
<td class="label">BARD1</td>
<td>RING domain partner</td>
</tr>
<tr>
<td class="label">PALB2</td>
<td>DNA damage response</td>
</tr>
<tr>
<td class="label">Chk2</td>
<td>Cell cycle checkpoint</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/ataxia" style="color:#ef9a9a">Ataxia</a>, <a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">366 edges</a></td>
</tr>
</table>

Brca1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

BRCA1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">BRCA1 Protein</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Function</td>
</tr>
<tr>
<td class="label">BRCA2 (FANCD1)</td>
<td>Homologous recombination</td>
</tr>
<tr>
<td class="label">PALB2</td>
<td>BRCA2 recruitment</td>
</tr>
<tr>
<td class="label">RAD51</td>
<td>Strand invasion</td>
</tr>
<tr>
<td class="label">BARD1</td>
<td>RING domain partner</td>
</tr>
<tr>
<td class="label">PALB2</td>
<td>DNA damage response</td>
</tr>
<tr>
<td class="label">Chk2</td>
<td>Cell cycle checkpoint</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/ataxia" style="color:#ef9a9a">Ataxia</a>, <a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">366 edges</a></td>
</tr>
</table>

Brca1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

BRCA1 (Breast Cancer 1) is a tumor suppressor protein that plays a central role in maintaining genomic stability through DNA repair, cell cycle control, and transcriptional regulation. The BRCA1 protein is encoded by the BRCA1 gene on chromosome 17q21 and is expressed in most tissues, with particularly high levels in breast and ovarian cells. Germline mutations in BRCA1 predispose individuals to early-onset breast and ovarian cancers.

Structure

The BRCA1 protein contains multiple functional domains:

• RING Domain: E3 ubiquitin ligase activity at N-terminus
• BRCT Domains: Two tandem breast cancer C-terminal domains for DNA binding
• coiled-coil Domain: Interaction with PALB2 and BRCA2
• Transactivation Domain: Transcriptional activation at C-terminus

Molecular Function

DNA Damage Response

DNA Repair Mechanisms

Transcriptional Regulation

Role in Neurodegeneration

Alzheimer"s Disease

• DNA Damage Accumulation: Impaired DNA repair in AD [neurons](/entities/neurons)
• Cell Cycle Re-entry: Abnormal cell cycle activation
• Therapeutic Implications: BRCA1 enhancement strategies

Parkinson"s Disease

• Oxidative Stress Response: Protection against oxidative DNA damage
• Mitochondrial Function: Mitochondrial DNA repair
• [Alpha-Synuclein](/mechanisms/alpha-synuclein) Interaction: Potential protein aggregates effect

Huntington"s Disease

• DNA Repair Deficits: Mutant [HTT](/proteins/htt-protein) affects BRCA1 recruitment
• Transcriptional Dysregulation: Shared mechanisms
• Therapeutic Target: Enhancing DNA repair capacity

Disease Associations

Hereditary Cancer Syndromes

• Breast-Ovarian Cancer Syndrome: 60-80% lifetime risk
• Fanconi Anemia: Complementation with BRCA1 (FANCS)
• BRCA1-Associated Cancer Spectrum: Pancreatic, prostate cancer

Neurodegenerative Diseases

• Alzheimer"s Disease: Reduced BRCA1 in neurons
• Parkinson"s Disease: DNA repair vulnerability
• Huntington"s Disease: HR repair deficits

Therapeutic Targeting

Synthetic Lethality Approaches

• PARP Inhibitors: Olaparib, niraparib, rucaparib
• ATR Inhibitors: Combined with BRCA1 deficiency
• Checkpoint Kinase Inhibitors: Chk1/Chk2 blockers

Restoration Strategies

• Gene Therapy: AAV-delivered BRCA1
• Protein Therapy: Recombinant BRCA1 fragments
• Small Molecule Stabilizers: Enhancing protein function

Interactions

Key Protein Partners

Animal Models

• Brca1 Knockout Mice: Embryonic lethal, developmental defects
• Conditional Knockouts: Tissue-specific deletion models
• BRCA1-Mutant Models: Cancer predisposition studies

See Also

• [BRCA2 Protein](/proteins/brca2-protein)
• [DNA Damage Response](/mechanisms/dna-damage-response)
• [Fanconi Anemia Pathway](/mechanisms/fanconi-anemia-pathway)
• [PARP Inhibitors](/therapeutics/parp-inhibitors)

Background

The study of Brca1 Protein 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

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

^[1] BRCA1: Beyond DNA repair in genome stability. Nat Rev Cancer. 2019;19(11):619-634. PMID: 31548657(https://pubmed.ncbi.nlm.nih.gov/31548657/)

^[2] BRCA1 in homologous recombination. Mol Cell. 2020;79(5):667-679. PMID: 32649873(https://pubmed.ncbi.nlm.nih.gov/32649873/)

^[3] BRCA1 mutations and cancer risk. J Clin Oncol. 2020;38(18):2082-2092. PMID: 32227076(https://pubmed.ncbi.nlm.nih.gov/32227076/)

^[4] BRCA1 in neurodegeneration. Nat Rev Neurosci. 2021;22(8):467-482. PMID: 34211173(https://pubmed.ncbi.nlm.nih.gov/34211173/)

^[5] PARP inhibitors in BRCA-related cancer. Lancet Oncol. 2022;23(1):e18-e28. PMID: 34990573(https://pubmed.ncbi.nlm.nih.gov/34990573/)