Dbp5p, a cytosolic RNA helicase, is required for poly(A)+ RNA export.

The DBP5 gene encodes a putative RNA helicase of unknown function in the yeast Saccharomyces cerevisiae. It is shown here that Dbp5p is an ATP-dependent RNA helicase required for polyadenylated [poly(A)+] RNA export. Surprisingly, Dbp5p is present predominantly, if not exclusively, in the cytoplasm, and is highly enriched around the nuclear envelope. This observation raises the possibility that Dbp5p may play a role in unloading or remodeling messenger RNA particles (mRNPs) upon arrival in the cytoplasm and in coupling mRNP export and translation. The functions of Dbp5p are likely to be conserved, since its potential homologues can be found in a variety of eukaryotic cells.

Requirement of the DEAD-Box protein ded1p for messenger RNA translation.

The DED1 gene, which encodes a putative RNA helicase, has been implicated in nuclear pre-messenger RNA splicing in the yeast Saccharomyces cerevisiae. It is shown here by genetic and biochemical analysis that translation, rather than splicing, is severely impaired in two newly isolated ded1 conditional mutants. Preliminary evidence suggests that the protein Ded1p may be required for the initiation step of translation, as is the distinct DEAD-box protein, eukaryotic initiation factor 4A (eIF4A). The DED1 gene could be functionally replaced by a mouse homolog, PL10, which suggests that the function of Ded1p in translation is evolutionarily conserved.

Dbp3p, a putative RNA helicase in Saccharomyces cerevisiae, is required for efficient pre-rRNA processing predominantly at site A3.

In Saccharomyces cerevisiae, ribosomal biogenesis takes place primarily in the nucleolus, in which a single 35S precursor rRNA (pre-rRNA) is first transcribed and sequentially processed into 25S, 5.8S, and 18S mature rRNAs, leading to the formation of the 40S and 60S ribosomal subunits. Although many components involved in this process have been identified, our understanding of this important cellular process remains limited. Here we report that one of the evolutionarily conserved DEAD-box protein genes in yeast, DBP3, is required for optimal ribosomal biogenesis. DBP3 encodes a putative RNA helicase, Dbp3p, of 523 amino acids in length, which bears a highly charged amino terminus consisting of 10 tandem lysine-lysine-X repeats ([KKX] repeats). Disruption of DBP3 is not lethal but yields a slow-growth phenotype. This genetic depletion of Dbp3p results in a deficiency of 60S ribosomal subunits and a delayed synthesis of the mature 25S rRNA, which is caused by a prominent kinetic delay in pre-rRNA processing at site A3 and to a lesser extent at sites A2 and A0. These data suggest that Dbp3p may directly or indirectly facilitate RNase MRP cleavage at site A3. The direct involvement of Dbp3p in ribosomal biogenesis is supported by the finding that Dbp3p is localized predominantly in the nucleolus. In addition, we show that the [KKX] repeats are dispensable for Dbp3p's function in ribosomal biogenesis but are required for its proper localization. The [KKX] repeats thus represent a novel signaling motif for nuclear localization and/or retention.

Adult survivors of childhood sexual abuse: survivor's disclosure and nurse therapist's response.

Recent literature pertinent to adult survivors suggests that childhood sexual abuse is a serious problem, and that disclosure is on the rise. The aftereffects of childhood sexual abuse can cause dysfunction in various aspects of the survivor's physical and mental health. Understanding the traumagenic dynamics of childhood sexual abuse and its aftereffects provides direction for the nurse therapist during both the client's disclosure and intervention planning. This knowledge assists the therapist in promoting mental health and healing, as well as providing comfort for the therapist. The nurse therapist's reactions to the client's disclosure can affect the way the client feels about disclosure and the therapeutic relationship. If a negative message is conveyed to the survivor at the time of disclosure, the feelings of betrayal, stigmatization, and powerlessness that the survivor experienced as a child will be replicated. This can damage the therapeutic relationship and delay the healing process. When disclosure is received and acted upon in a sensitive, therapeutic manner, the survivor is empowered and can enter with the nurse therapist into an effective therapeutic alliance. Nurse therapists should gain awareness of the types of emotional responses that can be engendered in the health professional during disclosure. Awareness of these emotional reactions can lead to the identification of coping strategies useful to both the therapist and the adult survivor. Coping strategies useful to the therapist include maintaining adequate boundaries, understanding oneself and one's responses to sexual-abuse issues, utilizing ongoing consultation or supervision, and preventing burnout.(ABSTRACT TRUNCATED AT 250 WORDS)

Nursing research in a school setting.

As more nurses are expanding their role and moving beyond traditional staff nursing, it is becoming increasingly common to find nurses conducting research. The utilization of schools as research sites is on the rise. Life events in families, such as divorce, unemployment, and geographic relocation, predispose school-aged children to high levels of stress, and nurse researchers are in a position to examine students' responses to these stressors. The purpose of this article is to discuss four issues inherent to research in schools, and to share some strategies which were effective. The issues include recruitment of subjects, informed consent, interviewing subjects, and coping with the unpredictable.