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Olfactory-like receptors (OLRs) have been shown previously to be expressed in adult and foetal human tongue. This prompted us to verify the hypothesis if OLRs were involved in taste perception. In the present work, the mouse orthologs of OLR genes expressed in adult and/or foetal human tongue were identified. Analysis of their genomic localization and of their primary sequence features using bioinformatics...
A cadherin-like protein present in the midgut epithelial cells of Lepidoptera is associated with insect resistance to Bacillus thuringiensis Cry toxins. We describe for the first time the genes that encode the cadherin-like proteins in Ostrinia nubilalis, Helicoverpa armigera, and Bombyx mori, and analyze their organization. These genes encompass 19.6 kb, 20.0 kb, and 41.8 kb of genomic DNA, respectively,...
The molecular basis for the spectral tuning of longwave-sensitive (LWS) visual pigments in mammals have been described in a wide range of placental species, including the primates. However, little is known about the molecular mechanisms in marsupial LWS pigments. Here, we have studied and compared the LWS opsins in four Australian marsupials: two diprotodonts and two polyprotodonts. Phylogenetic analysis...
We readdress the issue of phylogeny of the basal extant angiosperms employing a source previously not systematically investigated, specifically, the non-coding sequences of cpDNA. Comparison of trees with and without grasses or the outgroup (Pinus) in our analyses revealed no rearrangements in tree topology that might be expected if LBA were distorting the position of the magnoliids. For each model...
We describe here a nested PCR-based strategy for genome walking to extend a known sequence region to its uncharacterized flanking regions. This technique involves the use of a partially degenerate primer as a walker primer and a set of nested specific primers to perform two to three successive rounds of nested PCR. To increase the success rate of genome walking, four different walker primers were...
Complete mitochondrial genome sequences are presented from two dipluran hexapods (i.e., a group of “primarily wingless insects”) of the genus Campodea and compared to those of other arthropods. Their gene order is the same as in most other hexapods and crustaceans. Structural changes have occurred in tRNA-C, tRNA-R, tRNA-S1 and tRNA-S2 as well as in both ribosomal RNAs. These mtDNAs have striking...
Apparent full-length cDNA sequences coding respectively for mitochondrial (HvGPx41) and nuclear (HvGPx42) phospholipid hydroperoxide glutathione peroxidase were isolated from Hydra vulgaris. The cDNA sequences share total identity in their 3′-end and differ in their 5′-end. The protein-coding regions of the HvGPx41 and HvGPx42 cDNA encode polypeptides of 190 and 168 amino acids, including a TGA-encoded...
The expression of genes in higher plant chloroplasts includes a complex transcriptional regulation which can be explained only in part with the action of the actually known components of the transcriptional machinery. This suggests the existence of still unknown important regulatory factors which influence chloroplast transcription. In order to test if such factors could exist we performed in silico...
We describe DNA sequence polymorphisms at six loci (Acp26Aa, Acp26Ab, Acp29AB, Idgf1, Idgf3 and Ddc), all on the second chromosome of Drosophila melanogaster in one natural European population. Previous studies considering these loci separately showed that some of them were affected by natural selection. However, demographic processes or population admixture can produce footprints similar to natural...
Chargaff' s second parity rule (PR2) states that complementary nucleotides are met with almost equal frequencies in single stranded DNA. This is indeed the case for all bacterial and eukaryotic genomes studied, although the genomic patterns may differ among genomes in terms of local deviations. The behaviour of organellar genomes regarding the second parity rule has not been studied in detail up to...
The 16,937-nuceotide sequence of the linear mitochondrial DNA (mt-DNA) molecule of the moon jelly Aurelia aurita (Cnidaria, Scyphozoa) – the first mtDNA sequence from the class Scypozoa and the first sequence of a linear mtDNA from Metazoa – has been determined. This sequence contains genes for 13 energy pathway proteins, small and large subunit rRNAs, and methionine and tryptophan tRNAs. In addition,...
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