The mammalian homologue of mago nashi encodes a serum-inducible protein

The products of at least 11 maternal effect genes have been shown to be essential for proper germ plasm assembly in Drosophila melanogaster embryos. Here we report the isolation and characterization of the mammalian counterpart for one of these genes (named MAGOH for mago nashi homologue). The predicted amino acid sequence of mouse and human MAGOH are completely identical; MAGOH homologues from the nematode Caenorhabditis elegans and rice grain Oryza sativa also show a remarkable degree of amino acid conservation. MAGOH was mapped to chromosome 1p33-p34 in the human and a syntenic region of chromosome 4 in the mouse. Of note, MAGOH mRNA expression is not limited to germ plasm, but is expressed ubiquitously in adult tissues and can be induced by serum stimulation of quiescent fibroblasts.

Expression of the SIL gene is correlated with growth induction and cellular proliferation

The SIL gene was discovered at the site of a cancer-associated interstitial deletion in which its promoter assumed the regulation of a second gene, SCL. The human SIL gene encodes a 1287-amino acid cytosolic protein that has been found to be highly conserved in the mouse. SIL is expressed in proliferating cells and is down-regulated when cellular proliferation ceases because of serum starvation, contact inhibition, or induction of terminal differentiation. SIL is induced within 1 h of stimulation by 20% serum in growth-arrested 3T3 cells. This induction is independent of protein synthesis because "superinduction" is observed in the presence of the protein synthesis inhibitor cyclohexamide. Thus, SIL is an immediate-early gene. Upon release from serum starvation of 3T3 fibroblasts, SIL mRNA and protein levels display a biphasic pattern during the first cell cycle. In contrast, in exponentially growing EL4 lymphoblasts, SIL mRNA is stable throughout the cell cycle, whereas SIL protein accumulates into G2 phase and then falls precipitously at the completion of the cell cycle. This pattern of cell cycle expression suggests that SIL may play an important role in cellular growth and proliferation.

Order writing for parenteral nutrition by registered dietitians

OBJECTIVES

The purpose of the study was to describe the involvement of registered dietitians in parenteral nutrition (PN) orders, to identify characteristics of those who write orders; and to rank education, training, and support elements that dietitians believe facilitate PN order-writing skills.

DESIGN

Mail survey method.

SUBJECTS

Usable returned questionnaires (n = 266) represented randomly sampled membership of the Dietitians in Nutrition Support (a dietetic practice group of The American Dietetic Association) and registered dietitian membership of the American Society of Parenteral and Enteral Nutrition.

STATISTICAL ANALYSIS

Data were analyzed using basic frequency displays on all questionnaire items, Pearson correlations between the quantitative variables, and one-way analysis of variance with each of the categorical variables and the quantitative variables. Detail exploration among variables was done by chi(2) analyses and two-tailed t tests.

RESULTS

"Recommend" was the most frequent response to a query about participation in PN orders. An average of 37% of respondents sometimes or always wrote orders for nutrients. Specialists were more likely to write orders than clinicians and managers. No relationship was found between those who wrote orders and educational level, and writers had been registered for a shorter length of time. Agreement on the training and support needed for order-writing skills was nearly unanimous.

APPLICATIONS

The PN skills of respondents who were specialists distinguished them from managers and clinicians. Specialists did not fit criteria for advanced practice, and specialty practice in metabolic nutrition care may be too broad to define their practice. Educators must recognize the importance of including PN training in didactic and clinical training programs. Registered dietitians with PN skills will be well positioned to play an active role in the evolving health care system.