Source Population Characteristics Affect Heterosis Following Genetic Rescue of Fragmented Plant Populations.

Source population characteristics affect heterosis following genetic rescue of fragmented plant populations.

Filed under: Depression Treatment

Proc Biol Sci. 2013 Jan 7; 280(1750): 20122058
Pickup M, Field DL, Rowell DM, Young AG

Understanding the relative importance of heterosis and outbreeding depression over multiple generations is a key question in evolutionary biology and is essential for identifying appropriate genetic sources for population and ecosystem restoration. Here we use 2455 experimental crosses between 12 population pairs of the rare perennial plant Rutidosis leptorrhynchoides (Asteraceae) to investigate the multi-generational (F(1), F(2), F(3)) fitness outcomes of inter-population hybridization. We detected no evidence of outbreeding depression, with inter-population hybrids and backcrosses showing either similar fitness or significant heterosis for fitness components across the three generations. Variation in heterosis among population pairs was best explained by characteristics of the foreign source or home population, and was greatest when the source population was large, with high genetic diversity and low inbreeding, and the home population was small and inbred. Our results indicate that the primary consideration for maximizing progeny fitness following population augmentation or restoration is the use of seed from large, genetically diverse populations.
HubMed – depression

 

Thiamine Nutritional Status and Depressive Symptoms Are Inversely Associated among Older Chinese Adults.

Filed under: Depression Treatment

J Nutr. 2012 Nov 21;
Zhang G, Ding H, Chen H, Ye X, Li H, Lin X, Ke Z

Thiamine has been hypothesized to play an important role in mental health; however, few studies have investigated the association between thiamine nutritional status and depression in the general population. Concentrations of free thiamine and its phosphate esters [thiamine monophosphate (TMP) and thiamine diphosphate (TDP)] in erythrocytes were measured by HPLC among 1587 Chinese men and women aged 50-70 y. The presence of depressive symptoms was defined as a Center for Epidemiological Studies Depression Scale score of ?16. The median erythrocyte concentration (nmol/L) was 3.73 for free thiamine, 3.74 for TMP, and 169 for TDP. The overall prevalence of depressive symptoms was 11.3%. Lower concentrations of all 3 erythrocyte thiamine biomarkers were monotonically associated with a higher prevalence of depressive symptoms: the multivariable adjusted ORs comparing the lowest with the highest quartiles were 2.97 (95% CI = 1.87, 4.72; P-trend < 0.001) for free thiamine, 3.46 (95% CI = 1.99, 6.02; P-trend < 0.001) for TMP, and 1.98 (95% CI = 1.22, 3.21; P-trend = 0.002) for TDP. In conclusion, poorer thiamine nutritional status and higher odds of depressive symptoms were associated among older Chinese adults. This finding should be further investigated in prospective or interventional studies. HubMed – depression

 

Counseling in primary care improves depression and quality of life.

Filed under: Depression Treatment

Clin Pract Epidemiol Ment Health. 2012; 8: 152-7
Carta M, Petretto D, Adamo S, Bhat K, Lecca M, Mura G, Carta V, Angermeyer M, Moro M

To measure the effectiveness on Quality of Life of adjunctive cognitive behavioral counseling in the setting of General Practitioners (GPs) along with the treatment as usual (TAU;) for the treatment of depression.Six month-controlled trial of patients who were referred to randomly assigned GPs (four for experimental group of patients and ten for the control) was done. Experimental sample had 34 patients with DSM-IV diagnosis of Depression (Depressed Episode, Dysthymia, or Adjustment Disorder with Depressed Mood) receiving the TAU supplemented with counseling. Control group had 30 patients with diagnosis of Depression receiving only the TAU.The Beck Depression Inventory (BDI) score improved in both groups. Patients in the experimental group showed greater improvement compared to the control group at T2. The World Health Organization Quality OF Life Questionnaire (WHOQOL) score also improved in the experimental group but not in the control group. The improvement in the experimental group was statistically significant in terms of both BDI and WHOQOL scores.Adding counseling to TAU in general medical practice settings is more effective in controlling the symptoms of depression and improving the quality of life as measured over a period of six months, than TAU alone. These results while encouraging, also calls for a larger study involving a largersample size and a longer period of time.
HubMed – depression

 


 

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