In a recent paper in PNAS, Rigoutsos et al. (2006) describe a nonrandom pattern of repeated elements, called pyknons, which are found more frequently in the 3' untranslated regions of genes than in other regions of the human genome. Although it is unclear how pyknons might have arisen, it is possible that they may be involved in a new form of gene regulation.

improper drug prescription by physicians due to wrong diagnosis, wrong drug choise or other causes will waste national funds. the annual drug costs in iran is 900 billions rials. with approvement of prescription, it can be reduced to 500 billions rials. effective factors in costs reduction are: 1) increasing medical knowledge and persistent education of physicians. 2) spending more time for eac...

Minimal absent words (MAW) of a genomic sequence are subsequences that are absent themselves but the subwords of which are all present in the sequence. The characteristic distribution of genomic MAWs as a function of their length has been observed to be qualitatively similar for all living organisms, the bulk being rather short, and only relatively few being long. It has been an open issue whet...

The translation of many maternal mRNAs is regulated by dynamic changes in poly(A) tail length. During maturation of Xenopus oocytes, polyadenylation is mediated by three different cis elements in the 3' untranslated region (UTR) of maternal mRNAs. In this issue, Piqué et al. (2008) explore the interplay of these elements to elucidate a combinatorial code that predicts the timing of polyadenylat...

We study the length distribution of a particular class of DNA sequences known as the 5' untranslated regions exons. These exons belong to the messenger RNA of protein coding genes, but they are not coding (they are located upstream of the coding portion of the mRNA) and are thus less constrained from an evolutionary point of view. We show that in both mice and humans these exons show a very cle...

A second case has been found of a nematode gene involved in developmental timing that encodes a short, non-coding RNA. Both RNAs are expressed at specific times and appear to repress target genes by interacting with their 3' untranslated regions. A coincidence? Or does this pathway attract small RNA regulators?

This article has no abstract.

Despite impressive progress in diagnosis, treatment and control of hypertension, this symptom is still one of the major causes of brain and kidney disease as well as cardiac insufficiencies. Since the control of blood lipids, glucose and body weight are highly important in the prevention and treatment of hypertensive drugs, this epidemiologic study was carried out in Islamshahr, 30 Km. to The S...

Despite impressive progress in diagnosis. treatment and control of hypertension, this symptom is still one of the major causes of brain and kidney disease as well as cardiac insufficiencies. Since the control of blood lipids, glucose and body weight are highly important in the prevention and treatment of hypertensive drugs, this epidemiologic study was carried out in Islamshahr, 30 Km. to The S...