RESUMEN
We characterized the molecular allelic variation of RNases at the self-incompatibility (SI) locus of Solanum chilense Dun. We recovered 30 S-RNase allele sequences from 34 plants representing a broad geographic sample. This yielded a species-wide estimate of 35 (95% likelihood interval 31-40) S-alleles. We performed crosses to confirm the association with SI function of 10 of the putative S-RNase allele sequences. Results in all cases were consistent with the expectation that these sequences represent functional alleles under single-locus gametophytic SI. We used the allele sequences to conduct an analysis of selection, as measured by the excess of nonsynonymous changes per site, and found evidence for adaptive changes both within the traditionally defined hypervariable regions and downstream, near the 3'-end of the molecule.
Asunto(s)
Alelos , Variación Genética , Polinización/genética , Solanum/genéticaRESUMEN
T2-type RNases are responsible for self-pollen recognition and rejection in three distantly related families of flowering plants-the Solanaceae, Scrophulariaceae, and Rosaceae. We used phylogenetic analyses of 67 T2-type RNases together with information on intron number and position to determine whether the use of RNases for self-incompatibility in these families is homologous or convergent. All methods of phylogenetic reconstruction as well as patterns of variation in intron structure find that all self-incompatibility RNases along with non-S genes from only two taxa form a monophyletic clade. Several lines of evidence suggest that the best interpretation of this pattern is homology of self-incompatibility RNases from the Scrophulariaceae, Solanaceae, and Rosaceae. Because the most recent common ancestor of these three families is the ancestor of approximately 75% of dicot families, our results indicate that RNase-based self-incompatibility was the ancestral state in the majority of dicots.
Asunto(s)
Endorribonucleasas/genética , Evolución Molecular , Magnoliopsida/enzimología , Magnoliopsida/genética , FilogeniaRESUMEN
A case of Dressler's syndrome which has developed in a patient with bronchogenic carcinoma during radiotherapy is presented. Diagnosis is established according to symptomatology, clinical findings, chest X-ray, laboratory analysis and immunological findings. Existence of metastatic deposits in heart is excluded by the method of echocardiography. Short-term cardiologic therapy with antiflogistics is completely sufficient for maintaining the stability of "cardiologic status".