The large intergenic region of Rice tungro bacilliform virus evolved differentially among geographically distinguished isolates

Virus Genes ◽  
2011 ◽  
Vol 44 (2) ◽  
pp. 312-318 ◽  
Author(s):  
Amrita Banerjee ◽  
Somnath Roy ◽  
Jayanta Tarafdar
Virology ◽  
1995 ◽  
Vol 208 (1) ◽  
pp. 303-311 ◽  
Author(s):  
Paula Suärez-López ◽  
Encarnación Martı́nez-Salas ◽  
Pablo Hernández ◽  
Crisanto Gutiérrez

1996 ◽  
Vol 70 (5) ◽  
pp. 2999-3010 ◽  
Author(s):  
J Fütterer ◽  
I Potrykus ◽  
Y Bao ◽  
L Li ◽  
T M Burns ◽  
...  

Genetics ◽  
1999 ◽  
Vol 152 (4) ◽  
pp. 1335-1341
Author(s):  
Izabela Noll ◽  
Steffen Müller ◽  
Albrecht Klein

Abstract Methanococcus voltae harbors genetic information for two pairs of homologous [NiFe]-hydrogenases. Two of the enzymes contain selenocysteine, while the other two gene groups encode apparent isoenzymes that carry cysteinyl residues in the homologous positions. The genes coding for the selenium-free enzymes, frc and vhc, are expressed only under selenium limitation. They are transcribed out of a common intergenic region. A series of deletions made in the intergenic region localized a common negative regulatory element for the vhc and frc promoters as well as two activator elements that are specific for each of the two transcription units. Repeated sequences, partially overlapping the frc promoter, were also detected. Mutations in these repeated heptanucleotide sequences led to a weak induction of a reporter gene under the control of the frc promoters in the presence of selenium. This result suggests that the heptamer repeats contribute to the negative regulation of the frc transcription unit.


Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 641
Author(s):  
Julio Chávez-Galarza ◽  
Ruth López-Montañez ◽  
Alejandra Jiménez ◽  
Rubén Ferro-Mauricio ◽  
Juan Oré ◽  
...  

Mitochondrial DNA variations of Peruvian honey bee populations were surveyed by using the tRNAleu-cox2 intergenic region. Only two studies have characterized these populations, indicating the presence of Africanized honey bee colonies in different regions of Peru and varied levels of Africanization, but the current status of its genetic diversity is unknown. A total of 512 honey bee colonies were sampled from three regions to characterize them. Our results revealed the presence of European and African haplotypes: the African haplotypes identified belong to sub-lineage AI (13) and sub-lineage AIII (03), and the European haplotypes to lineages C (06) and M (02). Of 24 haplotypes identified, 15 new sequences are reported here (11 sub-lineage AI, 2 sub-lineage AIII, and 2 lineage M). Peruvian honey bee populations presented a higher proportion from African than European haplotypes. High proportions of African haplotype were reported for Piura and Junín, unlike Lima, which showed more European haplotypes from lineage C. Few colonies belonging to lineage M would represent accidental purchase or traces of the introduction into Peru in the 19th century.


Sign in / Sign up

Export Citation Format

Share Document