BackgroundMutations that impair mitochondrial functioning are associated with a variety of metabolic and age-related disorders. A barrier to rigorous tests of the role of mitochondrial dysfunction in aging processes has been the lack of model systems with relevant, naturally occurring mitochondrial genetic variation. Toward the goal of developing such a model system, we studied natural variation in life history, metabolic, and aging phenotypes as it relates to levels of a naturally-occurring heteroplasmic mitochondrial ND5 deletion recently discovered to segregate among wild populations of the soil nematode, Caenorhabditis briggsae. The normal product of ND5 is a central component of the mitochondrial electron transport chain and integral to cellular energy metabolism.ResultsWe quantified significant variation among C. briggsae isolates for all phenotypes measured, only some of which was statistically associated with isolate-specific ND5 deletion frequency. We found that fecundity-related traits and pharyngeal pumping rate were strongly inversely related to ND5 deletion level and that C. briggsae isolates with high ND5 deletion levels experienced a tradeoff between early fecundity and lifespan. Conversely, oxidative stress resistance was only weakly associated with ND5 deletion level while ATP content was unrelated to deletion level. Finally, mean levels of reactive oxygen species measured in vivo showed a significant non-linear relationship with ND5 deletion level, a pattern that may be driven by among-isolate variation in antioxidant or other compensatory mechanisms.ConclusionsOur findings suggest that the ND5 deletion may adversely affect fitness and mitochondrial functioning while promoting aging in natural populations, and help to further establish this species as a useful model for explicit tests of hypotheses in aging biology and mitochondrial genetics.

Non-prescribed HRT in transwomen is a common and poorly characterized phenomenon. Increasing access to healthcare (with culturally-competent, affordable, and accessible providers) is crucial to assuring trans people are able to have safe, consistent access to the hormones they need.

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OBJECTIVE: To describe the hysterectomy data among a cohort of transgender men and nontransgender (ie, cisgender) women with a particular goal to evaluate the feasibility of vaginal hysterectomy among transgender men. METHODS: This cohort study includes all hysterectomies performed for benign indications on transgender men and cisgender women at a single academic county hospital from 2000 to 2012. Hysterectomy cases and patient gender were identified by billing records and confirmed by review of medical records. Primary study outcome was the hysterectomy route among transgender men compared with cisgender women. We also examined risk factors and operative outcomes. Student two-sided t tests, χ2 analysis, and descriptive statistics are presented; sensitivity analyses using regression techniques were performed. RESULTS: Hysterectomies for benign gynecologic procedures were performed in 883 people: 33 on transgender men and 850 on cisgender women. Transgender men were younger, had fewer pregnancies and deliveries, and smaller uteri. The leading indication for hysterectomy differed significantly: pain (85%) was most common among transgender men (compared with 22% in cisgender women; P<.001), whereas leiomyomas (64%) was most common for cisgender women (compared with 21% in transgender men; P<.001). Vaginal hysterectomies were performed in 24% transgender men and 42% of cisgender women. Estimated blood loss was less among transgender men (P=.002), but when uterine size and route of hysterectomy were considered, the difference between gender groups was no longer significant. There was no difference in patients experiencing complications between the groups. CONCLUSION: Transgender men and cisgender women have different preoperative characteristics and surgical indications. Vaginal hysterectomies have been successfully completed among transgender men. Because vaginal hysterectomy is a viable procedure for this population, it should be considered in surgical planning for transgender men.