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Muscle actin gene from Aedes aegypti (Diptera:Culicidae)
M S Ibrahim1, S W Eisinger, A L Scott
1Department of Molecular Biology and Immunology, Johns Hopkins University School of Hygiene and Public Health, Baltimore, MD 21205-2179, USA.
Abstract:
A recombinant phagemid containing a 1,240-bp insert encoding an actin was isolated from a yellow fever mosquito, Aedes aegypti (L.), complementary DNA library. This insert (pBS-Act35) contained an open reading frame of 822 bp whose deduced amino acid sequence exhibited > 95% homology with the carboxyl terminal 274 amino acids of Drosophila melanogaster Meigen and silkworm, Bombyx mori (L.), actin genes. Reverse transcriptase-polymerase chain reaction was used to clone and determine the sequence of the additional 306 nucleotides that comprise the 5' end of the gene. The coding nucleotide sequence of the whole gene (designated Aeact-1) exhibited between 81 and 89% homology with coding sequences of D. melanogaster and B. mori actin genes, and its deduced amino acid sequence exhibited > 95% homology with those genes. The highest similarity of Aeact-1 gene at the amino acid sequence level was with B. mori and D. melanogaster muscle actins. Southern blot analysis indicated that the Aedes genome contains at least 5 actin-related sequences.
Insights
Researchers identified a novel actin gene in the yellow fever mosquito, Aedes aegypti. This gene, Aeact-1, shows high similarity to actin genes in fruit flies and silkworms, suggesting conserved functions.
Area of Science:
- Molecular Biology
- Genomics
- Entomology
Background:
- Actins are essential cytoskeletal proteins conserved across eukaryotes.
- Understanding actin gene diversity in insects like Aedes aegypti is crucial for developmental and physiological studies.
Purpose of the Study:
- To isolate and characterize an actin gene from the yellow fever mosquito, Aedes aegypti.
- To determine the sequence homology and evolutionary relationships of the identified actin gene with known actin genes from other species.
Main Methods:
- Construction and screening of a complementary DNA library from Aedes aegypti.
- Isolation of a phagemid insert (pBS-Act35) encoding an actin.
- Use of reverse transcriptase-polymerase chain reaction to obtain the full-length gene sequence (Aeact-1).
- Sequence homology analysis and Southern blot analysis.
Main Results:
- A 1,240-bp insert encoding an actin was isolated from Aedes aegypti.
- The full-length Aeact-1 gene exhibited high nucleotide and amino acid homology (>81% and >95%, respectively) with actin genes from Drosophila melanogaster and Bombyx mori.
- Southern blot analysis revealed at least 5 actin-related sequences in the Aedes genome.
Conclusions:
- The Aeact-1 gene is a highly conserved actin gene in Aedes aegypti.
- The findings provide insights into the evolutionary conservation of actin genes in insects.
- The presence of multiple actin-related sequences suggests a complex actin gene family in Aedes aegypti.