Subtopic Deep Dive

Fibrillin-1 Microfibril Assembly
Research Guide

What is Fibrillin-1 Microfibril Assembly?

Fibrillin-1 microfibril assembly is the supramolecular process by which fibrillin-1 molecules polymerize into 10-14 nm elastic microfibrils that scaffold elastin deposition in connective tissues.

Fibrillin-1 forms beaded microfibrils essential for elastic fiber integrity in tissues like arteries, lungs, and skin (Kielty et al., 2002, 796 citations). Defects in this assembly cause Marfan syndrome through FBN1 mutations (Dietz and Pyeritz, 1995, 483 citations). Over 10 key papers from 1995-2013 detail interactions with LTBP-1 and TGF-β regulation (Isogai et al., 2003, 539 citations).

Curated Papers

Key Challenges

Why It Matters

Understanding fibrillin-1 assembly enables therapies for Marfan syndrome by targeting TGF-β dysregulation, as shown in mouse models (Neptune et al., 2003, 1392 citations). It supports tissue engineering of elastic fibers for vascular grafts, relying on lysyl oxidase-like 1 for homeostasis (Liu et al., 2004, 654 citations). Insights into LTBP-1-fibrillin interactions guide treatments for elastinopathies and aneurysm prevention (Pereira et al., 1999, 538 citations; Isogai et al., 2003).

Key Research Challenges

TGF-β Dysregulation Mechanisms

Mutations in fibrillin-1 disrupt TGF-β sequestration, leading to excessive signaling in Marfan syndrome (Neptune et al., 2003). Clarifying activation pathways remains difficult due to variable tissue contexts. Liu et al. (2004) highlight cross-talk with lysyl oxidase-like 1.

Microfibril Polymerization Steps

Sequential assembly of fibrillin-1 domains, including cbEGF-like modules, requires calcium binding for stability (Downing et al., 1996, 447 citations). In vitro models struggle to replicate in vivo beading and bundling. Kielty et al. (2002) describe core mantle structures but kinetics are unresolved.

LTBP-1 Integration Dynamics

LTBP-1 binds fibrillin-1 to localize latent TGF-β on microfibrils, but binding sites and timing are unclear (Isogai et al., 2003). This affects matrix targeting in repair processes (To and Midwood, 2011, 611 citations). Pathogenic mutations alter these interactions in aneurysms (Pereira et al., 1999).

Essential Papers

Dysregulation of TGF-β activation contributes to pathogenesis in Marfan syndrome

Enid Neptune, Pamela A. Frischmeyer, Dan E. Arking et al. · 2003 · Nature Genetics · 1.4K citations

Elastic fibres

Cay M. Kielty, Michael J. Sherratt, C. Adrian Shuttleworth · 2002 · Journal of Cell Science · 796 citations

Elastic fibres are essential extracellular matrix macromolecules comprising an elastin core surrounded by a mantle of fibrillin-rich microfibrils. They endow connective tissues such as blood vessel...

Elastic fiber homeostasis requires lysyl oxidase–like 1 protein

Xiaoqing Liu, Yun Zhao, Jiangang Gao et al. · 2004 · Nature Genetics · 654 citations

Plasma and cellular fibronectin: distinct and independent functions during tissue repair

Wing S. To, Kim S. Midwood · 2011 · Fibrogenesis & Tissue Repair · 611 citations

Latent Transforming Growth Factor β-binding Protein 1 Interacts with Fibrillin and Is a Microfibril-associated Protein

Zenzo Isogai, Robert N. Ono, Shin Ushiro et al. · 2003 · Journal of Biological Chemistry · 539 citations

Latent transforming growth factor beta-binding protein 1 (LTBP-1) targets latent complexes of transforming growth factor beta to the extracellular matrix, where the latent cytokine is subsequently ...

Pathogenetic sequence for aneurysm revealed in mice underexpressing fibrillin-1

Lygia V. Pereira, Sui Ying Lee, Barbara Gayraud-Morel et al. · 1999 · Proceedings of the National Academy of Sciences · 538 citations

Dissecting aortic aneurysm is the hallmark of Marfan syndrome (MFS) and the result of mutations in fibrillin-1, the major constituent of elastin-associated extracellular microfibrils. It is yet to ...

Basic Components of Connective Tissues and Extracellular Matrix: Elastin, Fibrillin, Fibulins, Fibrinogen, Fibronectin, Laminin, Tenascins and Thrombospondins

Jaroslava Halper, Michael Kjær · 2013 · Advances in experimental medicine and biology · 503 citations

Reading Guide

Foundational Papers

Start with Kielty et al. (2002) for elastic fiber overview and microfibril structure, then Neptune et al. (2003) for Marfan pathogenesis via TGF-β, followed by Isogai et al. (2003) for LTBP-1 interactions.

Recent Advances

Ng et al. (2004, 476 citations) on mitral valve prolapse model; Liu et al. (2004, 654 citations) on lysyl oxidase homeostasis; Halper and Kjær (2013, 503 citations) on ECM components.

Core Methods

Electron microscopy for morphology (Kielty 2002), mouse models for mutations (Pereira 1999, Neptune 2003), NMR for cbEGF domains (Downing 1996), cell culture for assembly (Isogai 2003).

How PapersFlow Helps You Research Fibrillin-1 Microfibril Assembly

Discover & Search

Research Agent uses searchPapers('fibrillin-1 microfibril assembly Marfan') and citationGraph on Neptune et al. (2003) to map 1392-cited TGF-β papers, then findSimilarPapers reveals Kielty et al. (2002) and Liu et al. (2004) clusters for elastic fiber assembly.

Analyze & Verify

Analysis Agent applies readPaperContent on Isogai et al. (2003) to extract LTBP-1 binding motifs, verifies TGF-β claims via CoVe against Neptune et al. (2003), and runs PythonAnalysis to plot microfibril diameter distributions from Kielty et al. (2002) abstracts with GRADE scoring for evidence strength.

Synthesize & Write

Synthesis Agent detects gaps in polymerization kinetics from Pereira et al. (1999) and Dietz (1995), flags LTBP-1 contradictions; Writing Agent uses latexEditText for assembly pathway revisions, latexSyncCitations for 10-paper bibliography, and exportMermaid to diagram fibrillin-1 domain interactions.

Use Cases

"Analyze fibrillin-1 mutation effects on microfibril elasticity from Marfan papers using code."

Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas on mutation datasets from Dietz 1995/Neptune 2003) → matplotlib elasticity plots and statistical p-values.

"Write LaTeX review on LTBP-1 fibrillin interactions with citations."

Synthesis Agent → gap detection on Isogai 2003 → Writing Agent → latexEditText → latexSyncCitations (add Kielty 2002) → latexCompile → PDF with microfibril figure.

"Find GitHub repos with fibrillin-1 assembly simulations from papers."

Research Agent → paperExtractUrls (Liu 2004) → Code Discovery → paperFindGithubRepo → githubRepoInspect → Python scripts for lysyl oxidase modeling.

Automated Workflows

Deep Research workflow scans 50+ Marfan papers via searchPapers → citationGraph → structured report on assembly defects (Neptune 2003 core). DeepScan applies 7-step CoVe to verify LTBP-1 claims in Isogai 2003 against Kielty 2002. Theorizer generates hypotheses on cbEGF calcium roles from Downing 1996 structures.

Try Doxa for Fibrillin-1 Microfibril Assembly Research

Frequently Asked Questions

What defines fibrillin-1 microfibril assembly?

It is the polymerization of fibrillin-1 into 10-14 nm beaded microfibrils that scaffold elastin, as reviewed in Kielty et al. (2002).

What methods study this process?

Electron microscopy visualizes beading (Kielty et al., 2002), cell culture models test assembly (Pereira et al., 1999), and NMR solves domain structures (Downing et al., 1996).

What are key papers?

Neptune et al. (2003, 1392 citations) on TGF-β, Isogai et al. (2003, 539 citations) on LTBP-1, Kielty et al. (2002, 796 citations) on elastic fibers.

What open problems exist?

Kinetics of N-terminal assembly, exact LTBP-1 binding sites, and therapeutic restoration of mutant fibrillin-1 polymerization (Dietz and Pyeritz, 1995; Liu et al., 2004).