In Drosophila, the Glycerol-3-phosphate dehydrogenase (Gpdh) enzyme plays an active role in many pathways, including the glycerol metabolic pathway and the alphaglycerophosphate cycle. It is also important for ethanol metabolism, as well as flight muscle development. Recent years have exposed small RNAs as a major posttranscriptional regulator of multiple metabolic-pathway genes. Of the many kinds of these RNAs at work, micro RNAs (miRNAs) are the most widely implicated and well understood. However, the roles they may play in regulating Gpdh has never been shown in any model organism. In this study, a pasha-mutant D. melanogaster strain was found to express only 25% of the Gpdh levels typical of their wild type counterparts. Such mutants lack the ability to produce pasha, a protein integral during miRNA-processing, and as a consequence do not produce mature miRNAs. As miRNA-centric regulation often culminates in the depletion of their targets, the concurrent downregulation of Gpdh observed in their absence here therefore alludes to two possibilities: one, that rather than being explicitly bound and repressed by miRNAs, Gpdh expression relies on their action upon an upstream Gpdh-antagonist; or two, that Gpdh may come under the regulation of another class of miRNA-like elements called mirtrons, which do not require pasha to be processed into their functional form. The preliminary findings in this study further highlights the imperative nature of miRNAs in regulating metabolic processes and subsequently, ensuring proper organismal development and its continued survival.
Penentuan jantina burung adalah penting untuk tujuan kajian ekologi dan biologi evolusi, serta program pembiakan dan konservasi terutamanya bagi burung yang mempunyai ciri monomorfik. Bagi burung pungguk jelapang Tyto alba, pengesahan jantina adalah penting untuk konservasi serta program pengenalan bagi kawalan tikus perosak. Penentuan jantina secara molekular untuk subspesies Asia Tenggara, Tyto alba javanica, telah dijalankan menggunakan Reaksi Rantai Polimerase (PCR) diikuti 3% gel agaros elektroforesis. Primer P2/P8 and 2550F/2718R untuk amplifikasi gen CHD (Chromo Helicase DNA-binding gene) diuji dan kedua-dua set primer memberi keputusan yang berjaya. Set primer 2550F/2718R memberi hasil yang lebih baik kerana jurang di antara jalur berganda lebih terang. DNA yang diekstrak dari darah, darah yang dicairkan, serta DNA yang diekstrak dari bulu burung digunakan untuk menentukan jantina burung. DNA yang diekstrak dari bulu memberi keputusan yang kurang memuaskan akibat pencemaran serta kuantiti DNA yang rendah. Penentuan jantina menggunakan darah yang dicairkan merupakan kaedah yang menjimatkan kos serta masa. Penjujukan gen CHD dari Tyto alba javanica menunjukkan 98% hingga 99% kesamaan identiti bila dibandingkan gen CHD Tyto alba alba.