A modular network model of aging.
Huiling Xue1, Bo Xian, Dong Dong
1Chinese Academy of Sciences Key Laboratory of Molecular and Developmental Biology, Center for Molecular Systems Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.
Molecular Systems Biology
|December 7, 2007
Summary
Aging impacts specific protein-protein interaction (PPI) network modules, not the entire network. Some age-related network changes may reverse, and key regulatory genes influence longevity.
Area of Science:
- Systems biology
- Gerontology
- Network science
Background:
- Aging is a complex process with many unanswered questions.
- Understanding aging requires a systems-level approach beyond single genes or pathways.
- Protein-protein interaction (PPI) networks offer a framework for studying aging.
Purpose of the Study:
- To investigate the modular structure of PPI networks during aging in fruit flies and humans.
- To identify aging-associated changes in network modules and their functions.
- To explore the relationship between network module dynamics and aging/longevity.
Main Methods:
- Analysis of PPI network modularity in fruit fly and human brain aging.
- Examination of gene expression changes in aging-related network modules.
- Experimental validation using Caenorhabditis elegans lifespan analysis.
- Network simulations to explore aging mechanisms.
Main Results:
- Aging is associated with specific, rather than widespread, changes in network modules.
- Two modules linked to cell proliferation/differentiation showed opposing aging trends.
- Modules related to oxidative-reductive metabolism were also identified in aging flies.
- Genes connecting modules through PPIs were found to significantly impact aging and longevity.
- Network simulations indicated preferential targeting of critical regulatory nodes.
Conclusions:
- Aging affects a limited set of network modules, suggesting a focused impact.
- Some observed modular changes during aging may be reversible.
- Inter-modular connecting genes are crucial for aging and longevity.
- Aging may involve the disruption of key regulatory nodes, contributing to its stochastic nature.
Related Concept Videos
01:26Aging
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
01:19The Effect of Aging on Tissues
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
01:30Cognitive Development During Adulthood
Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
01:27Pharmacodynamics in Geriatric Patients: Effects of Age
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
01:27Emerging Adulthood
Jeffrey Arnett's concept of emerging adulthood offers a framework to understand the unique developmental stage between adolescence and full-fledged adulthood, generally from ages 18 to 25. This period is marked by extensive exploration and shifts in identity, relationships, and career choices, a process known in psychology as role experimentation. Emerging adulthood reflects the evolving cultural expectations surrounding adulthood and the dynamic process of personal transformation during this...
01:14Multicompartment Models: Overview
Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
These models offer a more comprehensive representation of drug behavior in the body than one-compartment models. They accommodate the complexity of drug distribution,...
These models offer a more comprehensive representation of drug behavior in the body than one-compartment models. They accommodate the complexity of drug distribution,...