The sudden appearance of bats in the fossil record (approximately 50 million years ago) suggests that the evolution of the morphological specializations of bats for powered flight (i.e., elongation of the forelimb phalanges and reduction of the ulna) occurred very rapidly. This study tests the hypothesis that changes in limb morphology, as seen in the rapid evolution of bats, arise from changes in the temporal and spatial expression of a few key regulators of limb development. To test this hypothesis, the molecular and morphological patterning of the specialized limbs of a bat (Carollia perspicillata) will be compared with those of a mouse (Mus musculus) that closely resemble the limbs of the pre-flight bat ancestor. By illustrating the morphological and molecular basis of the evolution of the bat wing, this study will provide a better understanding of the relationship between gene expression patterns and the resultant morphologies and expand our knowledge of the natural variation of the roles of these genes. In addition, understanding the normal roles of genes that also play a role in abnormal developmental events such as cancer (i.e., Ihh and BMP) will provide a knowledge base for additional healthcare-related biomedical research.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32HD050042-03
Application #
7247217
Study Section
Special Emphasis Panel (ZRG1-F05 (20))
Program Officer
Javois, Lorette Claire
Project Start
2005-05-01
Project End
2008-04-30
Budget Start
2007-05-01
Budget End
2008-04-30
Support Year
3
Fiscal Year
2007
Total Cost
$50,428
Indirect Cost
Name
University of Colorado Denver
Department
Pediatrics
Type
Schools of Medicine
DUNS #
041096314
City
Aurora
State
CO
Country
United States
Zip Code
80045
Ross, Darcy; Marcot, Jonathan D; Betteridge, Keith J et al. (2013) Constraints on Mammalian forelimb development: insights from developmental disparity. Evolution 67:3645-52
Sears, K E (2008) Molecular determinants of bat wing development. Cells Tissues Organs 187:6-12
Sears, K E; Goswami, A; Flynn, J J et al. (2007) The correlated evolution of Runx2 tandem repeats, transcriptional activity, and facial length in carnivora. Evol Dev 9:555-65
Sears, Karen E; Behringer, Richard R; Rasweiler 4th, John J et al. (2006) Development of bat flight: morphologic and molecular evolution of bat wing digits. Proc Natl Acad Sci U S A 103:6581-6