The Myc-Like Mlx Network Impacts Aging and Metabolism

Area of Science:

• Molecular Biology
• Genetics
• Aging Research

Background:

• The Myc and Mlx networks are crucial transcription factor networks that regulate fundamental cellular processes.
• Both networks share common gene targets and require specific heterodimerization partners for their activity.

Approach:

• This study investigated the in vivo function of the Mlx network by examining body-wide Mlx inactivation in mice.
• Phenotypic analysis and gene expression profiling were employed to assess the impact of Mlx loss on aging-related processes.

Key Points:

• Body-wide inactivation of Mlx accelerates aging phenotypes, including metabolic dysfunction and altered body composition.
• Deregulation of aging-related gene sets, particularly those involved in ribosomal and mitochondrial function and genomic stability, is accelerated by Mlx loss.
• Unlike Myc knockout mice, Mlx knockout mice exhibit normal lifespans but a slightly increased cancer incidence.

Conclusions:

• The Mlx network plays a significant role in regulating aging and metabolism, paralleling the functions of the Myc network.
• Deterioration of Mlx, MondoA, and ChREBP expression with age in both mice and humans underscores the importance of sustained network activity for healthy aging.
• Balanced cross-talk between the Myc and Mlx networks is essential for maintaining normal aging processes throughout life.