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C Benoist

Publications and source records attributed to C Benoist.

168 records · Page 10Linked to original sources
PubMed1979

Organisation and sequences at the 5' end of a cloned complete ovalbumin gene.

A clone which contains the complete chicken ovalbumin gene, including its leader coding sequences, has been isolated. From electron microscopic analysis of this DNA we conclude that the minimal size of the transcriptional unit for ovalbumin is 7.7 kilobases. The DNA sequence of the region surrounding the 5' end of the ovalbumin gene is presented. Comparison of this sequence with those of other eukaryotic genes reveals striking similarities, possibly related to a promoter region, approximately 30 base pairs upstream from the site coding for the 5' end of the mRNA.

Animals↗
PubMed1978

Ovalbumin gene: evidence for a leader sequence in mRNA and DNA sequences at the exon-intron boundaries.

Selected regions of cloned EcoRI fragments of the chicken ovalbumin gene have been sequenced. The positions where the sequences coding for ovalbumin mRNA (ov-mRNA) are interrupted in the genome have been determined, and a previously unreported interruption in the DNA sequences coding for the 5' nontranslated region of the messenger has been discovered. Because directly repeated sequences are found at exon-intron boundaries, the nucleotide sequence alone cannot define unique excision-ligation points for the processing of a possible ov-mRNA precursor. However, the sequences in these boundary regions share common features; this leads to the proposal that there are, in fact, unique excision-ligation points common to all boundaries.

Animals↗
PubMed1978

Effect of surgery under general anaesthesia on antipyrine clearance.

1 The effect of surgery under general anaesthesia on drug metabolism was investigated in man. The activity of hepatic drug-metabolizing enzymes was evaluated by measurement of antipyrine clearance, before surgery and 3 days after surgery, in eighteen patients. 2 In those patients in whom the operation lasted 2 h or less, the postoperative clearance of antipyrine was significantly (P less than 0.05) increased by 48%; in those patients in whom the operation lasted 2--4 h, it was non-significantly decreased by 36%; in those patients in whom the operation lasted more than 4 h, it was significantly decreased by 47% (P less than 0.01). 3 It is concluded (a) that short operations are followed by increased activity of hepatic drug-metabolizing enzymes, whereas (b) protracted operations are followed by decreased activity. It is suggested (a) that the former effect may be a consequence of enzyme induction by drugs used for premedication and anaesthesia, whereas (b) the latter effect may be the result of major surgical trauma.

Adult↗
PubMedDate not supplied

Induction of altered chromatin structures by simian virus 40 enhancer and promoter elements.

Two simian virus 40 transcriptional promoter elements, the 72-base pair (bp) repeat and the 21-bp repeat region, induce chromatin structures of increased DNase I sensitivity when transposed elsewhere in the viral genome. The induction of a sufficiently long stretch of DNase I-sensitive chromatin leads to the appearance of a visible nucleosome-free region.

Chromatin↗
PubMedDate not supplied

Correcting an immune-response deficiency by creating E alpha gene transgenic mice.

We have introduced a cloned Ek alpha gene into embryos of mice incapable of expressing their endogenous E alpha genes. The transcription of Ek alpha was accurate and tissue-specific in the resulting transgenic lines and, in macrophages, Ek alpha transcription could be induced by gamma-interferon. The injected gene conferred on the genetically deficient host strain the ability to mount an immune response to a synthetic polymer.

Animals↗