Molecular detection and characterization of <i>Hop stunt viroid</i> sequence variants from naturally infected pomegranate (<i>Punica granatum </i>L.) in Tunisia

Tunisian pomegranate Hop stunt viroid (HSVd) variants are described. Dot-blot hybridization, S-Page, and reverse transcription polymerase chain reaction (RT-PCR) of RNA extracts from infected tissues were carried out. Results obtained by these techniques were confirmed by cDNA sequencing. The genetic diversity among the Tunisian variants was investigated, which also involved analysis of sequences of previously described HSVd variants from Tunisian citrus var. clementine and fig, and from fruit trees from other Mediterranean countries. Phylogenetic analysis showed that Tunisian pomegranate HSVd variants were clustered into two groups: a cachexia strain within the citrus type group and a recombinant citrus-plum type group. Results also showed a high haplotype diversity which was not related either to the host or to the geographical origin. Selective neutrality and genetic network tests suggest that the HSVd isolates have spread rapidly

Molecular detection and characterization of Hop stunt viroid sequence variants from naturally infected pomegranate (Punica granatum L.) in Tunisia

Tunisian pomegranate Hop stunt viroid (HSVd) variants are described. Dot-blot hybridization, S-Page, and reverse transcription polymerase chain reaction (RT-PCR) of RNA extracts from infected tissues were carried out. Results obtained by these techniques were confirmed by cDNA sequencing. The genetic diversity among the Tunisian variants was investigated, which also involved analysis of sequences of previously described HSVd variants from Tunisian citrus var. clementine and fig, and from fruit trees from other Mediterranean countries. Phylogenetic analysis showed that Tunisian pomegranate HSVd variants were clustered into two groups: a cachexia strain within the citrus type group and a recombinant citrus-plum type group. Results also showed a high haplotype diversity which was not related either to the host or to the geographical origin. Selective neutrality and genetic network tests suggest that the HSVd isolates have spread rapidly

An unusual clinical manifestation of a relapsed typical pulmonary carcinoϊd tumor

Typical carcinoid tumors of the lungs carry an excellent prognosis after complete surgical excision. However, recurrence of these cancers remains poorly described in the literature and may occur many years after surgery.We report a case of carcinoid tumor of the lung. Clinical presentation and follow-up were uneventful.The 55 years old patient had got a surgical removal of a huge typical carcinoid tumor of the left lung. A left pneumonectomy with a mediastinal lymph node resection were performed. Thirteen years later, paraneoplastic acromegaly revealed a pulmonary and extrapulmonary recurrence of the tumor. We prescribed a chemotherapy regimen including Cisplatin and Etoposide.Endocrine paraneoplastic syndromes are related to mutations in specifically known genes. Several mutations may become a promising therapeutic target in the future. In the case of neuro-endocrine pulmonary tumors, authors described BCOR gene mutation as an oncogenic development inducer and an eventual generator of ectopic tumoral secretions.The more we get familiar with carcinoid tumor mutations, the closer we get to targeted therapy for non-resectable tumors

Synthesis, characterization and antimicrobial activity of some new azo dyes derived from 4-hydroxy-6-methyl-2H-pyran-2-one and its dihydro derivative

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