Data/hora: 04/06/2024 02:35:32

Provedor de dados: | 56
País: | Brazil
Título: | A 28-fold increase in secretory protein synthesis is associated with DNA puff activity in the salivary gland of Bradysia hygida (Diptera, Sciaridae)
Data: | 1997-05-01
Ano: | 1997
Palavras-chave: | Gene amplification; Secretory polypeptide synthesis; DNA puffs; Salivary glands of Sciaridae.
Resumo: | When the first group of DNA puffs is active in the salivary gland regions S1 and S3 of Bradysia hygida larvae, there is a large increase in the production and secretion of new salivary proteins demonstrable by [3H]-Leu incorporation. The present study shows that protein separation by SDS-PAGE and detection by fluorography demonstrated that these polypeptides range in molecular mass from about 23 to 100 kDa. Furthermore, these proteins were synthesized mainly in the S1 and S3 salivary gland regions where the DNA puffs C7, C5, C4 and B10 are conspicuous, while in the S2 region protein synthesis was very low. Others have shown that the extent of amplification for DNA sequences that code for mRNA in the DNA puffs C4 and B10 was about 22 and 10 times, respectively. The present data for this group of DNA puffs are consistent with the proposition that gene amplification is necessary to provide some cells with additional gene copies for the production of massive amounts of proteins within a short period of time (Spradling AC and Mahowald AP (1980) Proceedings of the National Academy of Sciences, USA, 77: 1096-1100).
Tipo: | Info:eu-repo/semantics/other
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000500006
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X1997000500006
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.30 n.5 1997
Fonte: | info:eu-repo/semantics/openAccess