Publications by A. Levasseur

Scientific advisory report – The use of forest biomass to reduce greenhouse gas emissions in Quebec. 2012. Beauregard, R.; Bouthillier, L.; Bernier, P.; Paré, D.; Thiffault, E.; Levasseur, A.; St-Laurent-Samuel, A. Ministère des Ressources naturelles et de la Faune du Québec, Québec, Que. 19 p.

Fri, 18 Jan 2013

Avis scientifique – L’utilisation de la biomasse forestière pour réduire les émissions de gaz à effet de serre du Québec. 2012. Beauregard, R.; Bouthillier, L.; Bernier, P.; Paré, D.; Thiffault, E.; Levasseur, A.; St-Laurent-Samuel, A. Ministère des Ressources naturelles et de la Faune du Québec, Québec (Québec). 19 p.

Fri, 18 Jan 2013

In vitro integration of an ichnovirus genome segment into the genomic DNA of lepidopteran cells. 2007. Doucet, D.; Levasseur, A.; Béliveau, C.; Lapointe, R.; Stoltz, D.; Cusson, M. J. Gen. Virol. 88: 105–113.

Tue, 22 May 2007

Polydnaviruses (PDVs) are dsDNA viruses transmitted by ichneumonid and braconid endoparasitoids to their lepidopteran hosts during oviposition. Wasp carriers are asymptomatic and transmit the virus to their progeny through the germ line; replication is confined to the calyx region of the wasp ovary, where the virus accumulates in the fluid bathing the eggs. In the lepidopteran host, however, no virus replication takes place, but PDV gene expression is essential for successful parasitism. Sustained gene expression in the absence of virus replication thus requires that the circular PDV genome segments persist for days within host cells. Available evidence suggests that most genome segments persist as episomes, but recent studies have indicated that some genome segments may undergo integration within lepidopteran genomic DNA, at least in vitro. In the present study, an integrated form of a Tranosema rostrale ichnovirus (TrIV) genome segment was cloned from genomic DNA extracted from infected Choristoneura fumiferana CF-124T cells and junction regions on either side of the viral DNA sequence were sequenced. This is the first proven example of integration of an ichnovirus genome segment in infected lepidopteran cells. Interestingly, circular forms of this genome segment do not appear to persist in these cells; none the less, a gene (TrFrep1) carried by this genome segment displays long-term transcription in infected cultured cells.

Three related TrIV genes: comparative sequence analysis and expression in host larvae and Cf-124T cells. 2003. Béliveau, C.; Levasseur, A.; Stoltz, D.; Cusson, M. J. Insect Physiol. 49: 501-511.

Thu, 28 Aug 2003

Evidence for a conserved polydnavirus gene family: ichnovirus homologs of the CsIV repeat element genes. 2002. Volkoff, A.N.; Béliveau, C.; Rocher, J.; Hilgarth, R.; Levasseur, A.; Duonor-Cérutti, M.; Cusson, M.; Webb, B.A. Virology 300: 316-331.

Tue, 22 Jul 2003

Hormonal alterations and molecular mechanisms underlying the induction of host developmental arrest by endoparasitic wasps. 2001. Cusson, M.; Béliveau, C.; Laforge, M.; Bellemare, G.; Levasseur, A.; Stoltz, D. Pages 111-121 in Endocrine Interactions of Parasites and Pathogens. (J.P. Edwards and R.J. Weaver, eds). BIOS Scientific Publishers, Oxford., .

Thu, 24 May 2007