Stable transformation of Theobroma cacao L. and influence of matrix attachment regions on GFP expression

We describe a protocol for Agrobacterium-mediated genetic transformation of Theobroma cacao L. using cotyledonary explants from primary somatic embryos (SEs) and A. tumefaciens strain AGL1. Transgenic plants carrying the visible marker, gene green fluorescent protein ( EGFP), the selectable marker gene neomycin phosphotransferase II ( NPTII), the class I chitinase gene from cacao ( Chi), and tobacco nuclear matrix attachment regions (MARs) in different combinations were successfully produced via regeneration of secondary SEs. The presence of the Chi gene or MARs did not influence the number of transgenic plants produced compared to the marker genes alone. However, the inclusion of MARs contributed to increased mean GFP expression in the population of transgenics. Additionally, the presence of MARs reduced the occurrence of gene silencing and stabilized high levels of GFP expression in lines of transgenic plants multiplied via reiterative somatic embryogenesis. Ninety-four transgenic plants were acclimated in a greenhouse and grown to maturity. Detailed growth analysis indicated that there were no differences in various growth parameters between transgenic and non-transgenic SE-derived plants. Seeds produced from two genetic crosses with one of the transgenic lines were analyzed for EGFP expression-a near-perfect 1:1 segregation was observed, indicating that this line resulted from the insertion of a single locus of T-DNA.

Varied presentations of sporadic group A streptococcal bacteremia: clinical experience and attempt at classification

The epidemiologic, clinical, and laboratory aspects of group A streptococcal bacteremia were studied in 33 patients seen at two urban hospitals in the Tel Aviv (Israel) area, over an 8-year period. Most patients (two-thirds) were female. Clinically significant bacteremia was observed in 26 patients, two of whom acquired their infection (puerperal sepsis) during hospitalization. A portal of entry, mainly cutaneous, was recognized in 61% of the patients, and a chronic underlying condition was observed in 69%. The case-fatality rate was 27%, with death occurring predominantly in patients admitted with shock or cryptogenic bacteremia. Our clinical experience and literature review show that the presentation of group A streptococcal bacteremia is diverse, with transient bacteremia of uncertain clinical significance on one end of the spectrum and overwhelming sepsis on the other. A practical classification of the various clinical forms of group A streptococcal bacteremia is proposed.

Cancer family syndrome of Lynch

This report describes a family in whom eight cancers (six colonic and two endometrial) occurred in seven relatives. The colonic cancer was diagnosed in five of the six affected patients at an unusually young age, had a predilection for the proximal colon, and was of the mucinous type in four patients. Polyposis was not found in any colon. The occurrence of cancer in this kindred is characteristic of the "cancer family syndrome" of Lynch.