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PubMed · 1490916

The quinine connection.

Abstract

Quinine, an alkaloid derived from the bark of the cinchona tree was brought to Europe from Peru in the 17th century. Isolation of quinine and other cinchona alkaloids was achieved in France in the early part of the 19th century and uncertainties of supply of the bark stimulated efforts to synthesize quinine. While attempting synthesis, the young chemist, William H. Perkin, stumbled on mauve purple, the first aniline dye. Use of dyes in histopathology and the infant specialty of medical microbiology established the reputation of Paul Ehrlich, and partial success with the use of dyes in trypanosomiasis and malaria encouraged the German dye industry to pursue these substances as antimicrobial agents. By good fortune, this led to the discovery of the sulphonamides by Gerhard Domagk in the mid-1930s, an event that stimulated much other work and may have influenced the development of antibiotics.

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BibTeXRIS

D Greenwood. 1992. The quinine connection.. https://doi.org/10.1093/jac%2F30.4.417

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Recurrence risk to offspring in extended multiplex schizophrenia pedigrees from a Pacific Island isolate.

Genetic transmission plays a major role in the pathogenesis of schizophrenia. Family, twin, and adoption studies have consistently shown that risks in relatives are many times greater than the general population risk of approximately 1%. McGue, Gottesman, and Rao (1983; Am J Hum Genet 35:1161-1178) calculated risk estimates of 12.8% for offspring and 3.5% for nieces/nephews of schizophrenia patients based on a large data set of Western European families. The present study evaluated corresponding risk levels in Palau, an isolated population in Micronesia where the prevalence of narrowly (broadly) defined schizophrenia is 1.99% (2.67%) and cases cluster in extended pedigrees, 20 of which contain 80% of affected individuals. We hypothesized that offspring in these extended families would have a higher risk for schizophrenia than offspring in smaller schizophrenia pedigrees from more genetically heterogeneous populations. RDC diagnostic data based on complete ascertainment of cases and their families covering the past two generations were used to quantify empirical recurrence risks in the offspring and nieces/nephews of Palauan schizophrenia patients. Risks to 1st- and 2nd-degree offspring were approximately double the rates found in the smaller Western European families: 23.4% in the offspring of an affected parent, 6.4% in offspring with one affected aunt/uncle, and 15.0% in offspring with two or more affected aunts/uncles. Recurrence rates in offspring of an affected parent were 1.6 times higher in males (27.9%) than in females (17.7%). The high risk levels we found in Palauan offspring reflect the elevated population prevalence, strong familial aggregation, and multi-lineal transmission pattern of schizophrenia in Palau.

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