The chemical compositions of the sinter ore, hot metal and iron slag, raw material dosages, process temperatures, cooling water flow rates and total cost of the raw materials, fuels and power investments of the ISPWP in one year are taken as the constraints, respectively.
XCI is a fundamental mammalian dosage compensation process, regulated by epigenetic mechanisms, that operates to ensure the equal expression of X-linked genes between males and females.
One thing is clear: the dosage compensation process will continue to fascinate us for quite sometime to come.
In the case of the RPs, we suspect that the initial preservation of the duplicated RP genes was for reasons of gene dosage; this process was likely followed by subfunctionalization (He and Zhang 2005; Innan and Kondrashov 2010).
Unlike RS447 and D4Z4, the location of DXZ4 on the X chromosome means that in females it is exposed to the mammalian dosage compensation process X chromosome inactivation (XCI).
X-chromosome inactivation (XCI), the dosage compensation process that equalizes X-linked gene expression between sexes, has mostly been studied in the mouse, where the central role for the non-coding RNA Xist in the initiation and spreading of the process was demonstrated.
It is possible that differences in transcript levels of these genes is due to differences downstream of Sxl, or X chromosome composition in males and females, suggesting that the dosage compensation process does not completely normalize expression between males and females for all genes on the X chromosome.
A large set of genes with male-biased expression that are not regulated downstream of tra are located on the × chromosome, with many adjacent to entry sites for the DCC, suggesting that the dosage compensation process also contributes to dimorphism in transcript abundance.
Lastly, in addition to gene dosage, the process of subfunctionalization can also contribute to the retention of both paralogs in the genome [ 46], although it makes no predictions about the patterns of sequence evolution of the paralogs given its stochastic nature.
The ABA-mediated stomatal response is a dosage-dependent process; thus, one genetic engineering approach for achieving drought avoidance could be to sensitize the guard cell's responsiveness to this hormone.
