Un gecko de compagnie développe un cancer: les scientifiques pensent qu'il pourrait aider les humains

A pet leopard gecko, known for its striking "lemon frost" coloration, has sparked interest among scientists due to its unusually high incidence of cancer. Researchers at the University of Nottingham have discovered that the genetic mutation responsible for the gecko’s unique appearance is also linked to the development of aggressive tumors. This finding could open new avenues in cancer research, offering a natural model for studying how the disease progresses in both animals and humans. The study focused on the genetic changes present in tumors from lemon frost geckos. Scientists compared tumor tissue with healthy tissue from the same animals and identified recurring DNA alterations. Many of the affected genes and biological pathways are also associated with cancers in humans and other animals. The natural occurrence of these tumors, rather than their induction through artificial means, makes the gecko a compelling subject for further investigation. Dr. Ylenia Chiari, lead researcher at the School of Life Sciences at the University of Nottingham, explained that although the high prevalence of tumors in lemon frost geckos raises ethical concerns regarding their welfare, it also presents significant opportunities for scientific study. These geckos typically develop tumors between six months and five years of age, and the tumors often recur in multiple areas of the body and can metastasize. Chiari noted that the tumors in question are called iridophoromas, which originate from iridophores, pigment cells not found in humans. Initially, the team was uncertain whether this difference would hinder the gecko's utility as a model for human cancer. However, their findings revealed that the genomic profiles of tumor and non-tumor tissues showed similarities with human cancers. The study uncovered novel genomic features alongside alterations in genes and pathways that are well-known for playing crucial roles in human cancers and metastasis. This discovery suggests that even though the tumors arise from a distinct type of cell, the underlying molecular mechanisms involved in their development and progression might share commonalities with human cancers. The researchers emphasized the potential benefits of examining naturally occurring cancers across a broader spectrum of species. By comparing animals prone to cancer with those that are resistant, scientists aim to gain deeper insights into the reasons behind cancer's emergence and spread. Chiari highlighted that the study underscores the importance of exploring cancer across the entire tree of life to address critical questions about human health. She added that the adaptability of genomic analysis tools originally designed for human cancers has proven effective in studying cancer in other species. Study co-author Brandon Hastings remarked on the methodological significance of the research, noting that the diversity of genomic software used for analyzing human cancers can yield meaningful insights in various organisms. Moving forward, Chiari plans to collaborate more closely with cancer biologists to explore the implications of the gecko model further. The research team aims to build upon their findings to develop new approaches for preventing, detecting, and treating cancer in humans. The lemon frost gecko, despite its unfortunate predisposition to tumors, may yet contribute significantly to advancements in oncology.