Phylogenetic relationships of the North American catfishes (Ictaluridae, Siluriformes): Investigating the origins and parallel evolution of the troglobitic species.

Insular habitats have played an important role in developing evolutionary theory, including natural selection and island biogeography. Caves are insular habitats that place extreme selective pressures on organisms due to the absence of light and food scarcity. Therefore, cave organisms present an excellent opportunity for studying colonization and speciation in response to the unique abiotic conditions that require extreme adaptations. One vertebrate family, the North American catfishes (Ictaluridae), includes four troglobitic species that inhabit the karst region bordering the western Gulf of Mexico. The phylogenetic relationships of these species have been contentious, and conflicting hypotheses have been proposed to explain their origins. The purpose of our study was to construct a time-calibrated phylogeny of Ictaluridae using first-occurrence fossil data and the largest molecular dataset on the group to date. We test the hypothesis that troglobitic ictalurids have evolved in parallel, thus resulting from repeated cave colonization events. We found that Prietella lundbergi is sister to surface-dwelling Ictalurus and that Prietella phreatophila + Trogloglanis pattersoni are sister to surface-dwelling Ameiurus, suggesting that ictalurids colonized subterranean habitats at least twice in evolutionary history. The sister relationship between Prietella phreatophila and Trogloglanis pattersoni may indicate that these two species diverged from a common ancestor following a subterranean dispersal event between Texas and Coahuila aquifers. We recovered Prietella as a polyphyletic genus and recommend P. lundbergi be removed from this genus. With respect to Ameiurus, we found evidence for a potentially undescribed species sister to A. platycephalus, which warrants further investigation of Atlantic and Gulf slope Ameiurus species. In Ictalurus, we identified shallow divergence between I. dugesii and I. ochoterenai, I. australis and I. mexicanus, and I. furcatus and I. meridionalis, indicating a need to reexamine the validity of each species. Lastly, we propose minor revisions to the intrageneric classification of Noturus including the restriction of subgenus Schilbeodes to N. gyrinus (type species), N. lachneri, N. leptacanthus, and N. nocturnus.

Parents' Experiences with Home-Based Oral Chemotherapy Prescribed to a Child Diagnosed with Acute Lymphoblastic Leukemia: A Qualitative Study.

Acute lymphoblastic leukemia (ALL) is the most common type of cancer in children. Treatment includes home-based oral chemotherapies (OCs) (e.g., 6-mercaptopurine and dexamethasone) taken for 2 to 3 years. The management of OC can be challenging for children and their parents. However, the multifaceted experience of families with children taking OC for ALL is largely undescribed. We report the experience with these OCs from the parents' perspective. We conducted a qualitative descriptive study. Semi-structured interviews were conducted with the parents of children with ALL aged < 15 years, followed in a specialized university-affiliated center. The interviews were fully transcribed and thematically analyzed. Thirteen of the seventeen eligible parents (76.5%) participated in the study. The parents' motivation to follow the recommendations provided by the multidisciplinary care team regarding OC was very high. The quantity and the quality of the information received were judged adequate, and the parents reported feeling knowledgeable enough to take charge of the OC at home. Adapting to the consequences of OC on family daily life was collectively identified as the biggest challenge. This includes developing and maintaining a strict daily routine, adapting to the child's neurobehavioral changes during dexamethasone days and adapting family social life. Our findings have several implications for enhancing the support offered to families with home-based OC for ALL. Supportive interventions should consider the family as a whole and their needs should be regularly monitored. Specific attention should be paid to the development and maintenance of a routine, to the parental burden, and to the emotional impact, especially regarding dexamethasone.