Evolutionary history of the recruitment of conserved developmental genes in association to the formation and diversification of a novel trait

The origin and modification of novel traits are important aspects of biological diversification. Studies combining concepts and approaches of developmental genetics and evolutionary biology have uncovered many examples of the recruitment, or co-option, of genes conserved across lineages for the formation of novel, lineage-restricted traits. However, little is known about the evolutionary history of the recruitment of those genes, and of the relationship between them -for example, whether the co-option involves whole or parts of existing networks, or whether it occurs by redeployment of individual genes with de novo rewiring. We use a model novel trait, color pattern elements on butterfly wings called eyespots, to explore these questions. Eyespots have greatly diversified under natural and sexual selection, and their formation involves genetic circuitries shared across insects.

Developmental control of H+/amino acid permease gene expression during seed development of Arabidopsis

Long distance transport of amino acids is mediated by several families of differentially expressed amino acid transporters. The two genes AAP1 and AAP2 encode broad specificity H+-amino acid co-transporters and are expressed to high levels in siliques of Arabidopsis, indicating a potential role in supplying the seeds with organic nitrogen. The expression of both genes is developmentally controlled and is strongly induced in siliques at heart stage of embryogenesis, shortly before induction of storage protein genes. Histochemical analysis of transgenic plants expressing promoter-GUS fusions shows that the genes have non-overlapping expression patterns in siliques. AAP1 is expressed in the endosperm and the cotyledons whereas AAP2 is expressed in the vascular strands of siliques and in funiculi. The endosperm expression of AAP1 during early stages of seed development indicates that the endosperm serves as a transient storage tissue for organic nitrogen. Amino acids are transported in both xylem and phloem but during seed filling are imported only via the phloem. AAP2, which is expressed in the phloem of stems and in the veins supplying seeds, may function in uptake of amino acids assimilated in the green silique tissue, in the retrieval of amino acids leaking passively out of the phloem and in xylem-to-phloem transfer along the path. The promoters provide excellent tools to study developmental, hormonal and metabolic control of nitrogen nutrition during development and may help to manipulate the timing and composition of amino acid import into seeds.

Eye Gaze and Turn Taking in Aphasia Patients

In every conversation you have, there is an unspoken code – a set of social rules that guide you. When to stop talking, where to look, when to listen and when to talk…

Supplemental driver safety program development. Volume I: developmental research and evaluation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Oil-in-water content monitor developmental program summary /

Supersedes report no. CG-D-188-75 (Dec. 1975)--with the same title.

Developmental methodology: basic training program for police traffic services. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Oogenesis: the storage of developmental information

Mode of access: Internet.

Results of tests on 25 bureau of ships - RCA developmental Williams memory tubes - type C73376B /

"April 29, 1953"

Illinois natural resources : an industrial developmental asset /

Cover title.

Alphechon : evaluation of a developmental video storage tube /

COO 1469-0197.

Animal science technology: an experimental developmental program.

Volume I. Report of the developmental program. Volume II. Curriculum course outlines.

Developmental disabilities abstracts.

Mode of access: Internet.

On aphasia, or loss of speech in cerebral disease.

Reprinted from the Journal of mental science.

The police heritage in England and America; a developmental survey,

Includes bibliography.

Developmental needs of small cities : a study required by section 113 of the Housing and community development act of 1977 /

Mode of access: Internet.