Evidence for Female-Biased Dispersal in the Protandrous Hermaphroditic Asian Seabass, Lates calcarifer

Movement of individuals influences individual reproductive success, fitness, genetic diversity and relationships among individuals within populations and gene exchange among populations. Competition between males or females for mating opportunities and/or local resources predicts a female bias in taxa with monogamous mating systems and a male-biased dispersal in polygynous species. In birds and mammals, the patterns of dispersal between sexes are well explored, while dispersal patterns in protandrous hermaphroditic fish species have not been studied. We collected 549 adult individuals of Asian seabass (Lates calcarifer) from four locations in the South China Sea. To assess the difference in patterns of dispersal between sexes, we genotyped all individuals with 18 microsatellites. Significant genetic differentiation was detected among and within sampling locations. The parameters of population structure (FST), relatedness (r) and the mean assignment index (mAIC), in combination with data on tagging-recapture, supplied strong evidences for female-biased dispersal in the Asian seabass. This result contradicts our initial hypothesis of no sex difference in dispersal. We suggest that inbreeding avoidance of females, female mate choice under the condition of low mate competition among males, and male resource competition create a female-biased dispersal. The bigger body size of females may be a cause of the female-biased movement. Studies of dispersal using data from DNA markers and tagging-recapture in hermaphroditic fish species could enhance our understanding of patterns of dispersal in fish

Methamphetamine Causes Differential Alterations in Gene Expression and Patterns of Histone Acetylation/Hypoacetylation in the Rat Nucleus Accumbens

Methamphetamine (METH) addiction is associated with several neuropsychiatric symptoms. Little is known about the effects of METH on gene expression and epigenetic modifications in the rat nucleus accumbens (NAC). Our study investigated the effects of a non-toxic METH injection (20 mg/kg) on gene expression, histone acetylation, and the expression of the histone acetyltransferase (HAT), ATF2, and of the histone deacetylases (HDACs), HDAC1 and HDAC2, in that structure. Microarray analyses done at 1, 8, 16 and 24 hrs after the METH injection identified METH-induced changes in the expression of genes previously implicated in the acute and longterm effects of psychostimulants, including immediate early genes and corticotropin-releasing factor (Crf). In contrast, the METH injection caused time-dependent decreases in the expression of other genes including Npas4 and cholecystokinin (Cck). Pathway analyses showed that genes with altered expression participated in behavioral performance, cell-to-cell signaling, and regulation of gene expression. PCR analyses confirmed the changes in the expression of c-fos, fosB, Crf, Cck, and Npas4 transcripts. To determine if the METH injection caused post-translational changes in histone markers, we used western blot analyses and identified METH-mediated decreases in histone H3 acetylated at lysine 9 (H3K9ac) and lysine 18 (H3K18ac) in nuclear sub-fractions. In contrast, the METH injection caused time-dependent increases in acetylated H4K5 and H4K8. The changes in histone acetylation were accompanied by decreased expression of HDAC1 but increased expression of HDAC2 protein levels. The histone acetyltransferase, ATF2, showed significant METH-induced increased in protein expression. These results suggest that METH-induced alterations in global gene expression seen in rat NAC might be related, in part, to METH-induced changes in histone acetylation secondary to changes in HAT and HDAC expression. The causal role that HATs and HDACs might play in METH-induced gene expression needs to be investigated further

Palliative Care Needs of Physically Frail Community-Dwelling Older Adults With Heart Failure

Context: Physical frailty is emerging as a potential “trigger” for palliative care (PC) consultation, but the PC needs of physically frail persons with heart failure (HF) in the outpatient setting have not been well described. Objectives: This study describes the PC needs of community dwelling, physically frail persons with HF. Methods: We included persons with HF ≥50 years old who experienced ≥1 hospitalization in the prior year and excluded those with moderate/severe cognitive impairment, hospice patients, or non-English speaking persons. Measures included the FRAIL scale (0–5: 0 = robust, 1–2 = prefrail, 3–5 = frail) and the Integrated Palliative Outcome Scale (IPOS) (17 items, score 0–68; higher score = higher PC needs). Multiple linear regression tested the association between frailty group and palliative care needs. Results: Participants (N = 286) had a mean age of 68 (range 50–92) were majority male (63%) and White (68%) and averaged two hospitalizations annually. Most were physically frail (44%) or prefrail (41%). Mean PC needs (IPOS) score was 19.7 (range 0–58). On average, participants reported 5.86 (SD 4.28) PC needs affecting them moderately, severely, or overwhelmingly in the last week. Patient-perceived family/friend anxiety (58%) weakness/lack of energy (58%), and shortness of breath (47%) were the most prevalent needs. Frail participants had higher mean PC needs score (26) than prefrail (16, P \u3c 0.001) or robust participants (11, P \u3c 0.001). Frail participants experienced an average of 8.32 (SD 3.72) moderate/severe/overwhelming needs compared to prefrail (4.56, SD 3.77) and robust (2.39, SD 2.91) participants (P \u3c 0.001). Frail participants reported higher prevalence of weakness/lack of energy (83%), shortness of breath (66%), and family/friend anxiety (69%) than prefrail (48%, 39%, 54%) or robust (13%, 14%, 35%) participants (P \u3c 0.001). Conclusion: Physically frail people with HF have higher unmet PC needs than those who are nonfrail. Implementing PC needs and frailty assessments may help identify vulnerable patients with unmet needs requiring further assessment and follow-up