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Significance: Molecular biology techniques are being used to aid in determining the mechanisms responsible for tissue repair without scar formation. Wound healing is genetically determined, but there have been few studies that examine the genes responsible for tissue regeneration in mammals. Research using genetic mapping is extremely important for understanding the molecular mechanisms involved in the different phases of tissue regeneration. This process is complex, but an early inflammatory phase appears to influence lesion closure, and the present study demonstrates that acute inflammation loci influence tissue regeneration in mice in a positive manner. Recent Advances: Mapping studies of quantitative trait loci (QTL) have been undertaken in recent years to examine candidate genes that participate in the regeneration phenotype. Our laboratory has identified inflammation modifier QTL for wound healing. Mouse lines selected for the maximum (AIRmax) or minimum (AIRmin) acute inflammatory reactivity (AIR) have been used to study not only the tissue repair but also the impact of the genetic control of inflammation on susceptibility to autoimmune, neoplasic, and infectious diseases. Murphy Roths Large and AIRmax mice are exclusive in their complete epimorphic regeneration, although middle-aged inbred mice may also be capable of healing. Critical Issues: Inflammatory reactions have traditionally been described in the literature as negative factors in the process of skin injury closure. Inflammation is exacerbated due to the early release of mediators or the intense release of factors that cause cell proliferation after injury. The initial release of these factors as well as the clean-up of the lesion microenvironment are both crucial for following events. In addition, the activation and repression of some genes related to the regeneration phenotype may modulate lesion closure, demonstrating the significance of genetic studies to better understand the mechanisms involved in the initiation of wound repair processes. Future Directions: The pleiotropic effects of the QTL are important in the identification of the genes responsible for tissue repair processes, especially when combined with global gene expression research. Microarray analysis complements the biological information obtained in QTL mapping, making this tool essential for gene identification. This approach will allow the investigation of future targets for therapeutic wound healing treatments.

Acute Inflammation Loci Are Involved in Wound Healing in the Mouse Ear Punch Model