PSYCHIATRISTS’ PSYCHOTROPIC DRUG PRESCRIPTION PREFERENCES FOR THEMSELVES OR THEIR FAMILY MEMBERS

Background: Psychiatrists\u27 preference for certain medications is not only determined by their efficacy and side effect profile but may also depend on the psychiatrists\u27 beliefs about specific therapeutic effects based on their own observation and experience. We aimed to evaluate which antipsychotic or antidepressant drugs psychiatrists would prefer for themselves, their partners and children in case of a mental illness. Subjects and methods: The study was conducted among psychiatrists in Serbia. The sample consisted of 90 psychiatrists who were asked to complete the questionnaire about their drug selection in hypothetical situations of becoming ill with schizophrenia or depression or these conditions occurring in their partners and children. Results: In case of schizophrenia, risperidone was the first choice made by most psychiatrists for themselves, their partners or children, followed by clozapine, haloperidol and olanzapine. In case of depression, SSRIs and SNRIs were generally favored, with sertraline and escitalopram being the preferred medications for psychiatrists, partners and their children. With regards to depression, 82.3% of participants would opt for an antidepressant as monotherapy or in combination, but 13.3% would opt for anxiolytic monotherapy. The preferred doses were slightly lower than the recommended ones, especially for antipsychotic agents. Conclusions: Most psychiatrists would take or administer atypical antipsychotics or SSRIs as the first choice for themselves, their partners or children. These preferences are mostly in accordance with current treatment guidelines, but there is still room to narrow the gap between guideline recommendations and psychiatrists\u27 medication choices in personally meaningful situations

Rat PRDM9 shapes recombination landscapes, duration of meiosis, gametogenesis, and age of fertility

International audienceBackground: Vertebrate meiotic recombination events are concentrated in regions (hotspots) that display open chromatin marks, such as trimethylation of lysines 4 and 36 of histone 3 (H3K4me3 and H3K36me3). Mouse and human PRDM9 proteins catalyze H3K4me3 and H3K36me3 and determine hotspot positions, whereas other vertebrates lacking PRDM9 recombine in regions with chromatin already opened for another function, such as gene promoters. While these other vertebrate species lacking PRDM9 remain fertile, inactivation of the mouse Prdm9 gene, which shifts the hotspots to the functional regions (including promoters), typically causes gross fertility reduction; and the reasons for these species differences are not clear.Results: We introduced Prdm9 deletions into the Rattus norvegicus genome and generated the first rat genome-wide maps of recombination-initiating double-strand break hotspots. Rat strains carrying the same wild-type Prdm9 allele shared 88% hotspots but strains with different Prdm9 alleles only 3%. After Prdm9 deletion, rat hotspots relocated to functional regions, about 40% to positions corresponding to Prdm9-independent mouse hotspots, including promoters. Despite the hotspot relocation and decreased fertility, Prdm9-deficient rats of the SHR/OlaIpcv strain produced healthy offspring. The percentage of normal pachytene spermatocytes in SHR-Prdm9 mutants was almost double than in the PWD male mouse oligospermic sterile mutants. We previously found a correlation between the crossover rate and sperm presence in mouse Prdm9 mutants. The crossover rate of SHR is more similar to sperm-carrying mutant mice, but it did not fully explain the fertility of the SHR mutants. Besides mild meiotic arrests at rat tubular stages IV (mid-pachytene) and XIV (metaphase), we also detected postmeiotic apoptosis of round spermatids. We found delayed meiosis and age-dependent fertility in both sexes of the SHR mutants.Conclusions: We hypothesize that the relative increased fertility of rat versus mouse Prdm9 mutants could be ascribed to extended duration of meiotic prophase I. While rat PRDM9 shapes meiotic recombination landscapes, it is unnecessary for recombination. We suggest that PRDM9 has additional roles in spermatogenesis and speciation-spermatid development and reproductive age-that may help to explain male-specific hybrid sterility