Sharma A, Singh D, Malik S, Gupta N, Rani S, Kumar V. Difference in control between spring and autumn migration in birds: insight from seasonal changes in hypothalamic gene expression in captive buntings. Proc Biol Sci. 2018;285: pubmed publisher
..These results demonstrate for the first time seasonal transition in hypothalamic gene expressions, and suggest differences in regulatory strategies at the transcriptional level for spring and autumn migrations in songbirds. ..
Majumdar G, Rani S, Kumar V. Hypothalamic gene switches control transitions between seasonal life history states in a night-migratory photoperiodic songbird. Mol Cell Endocrinol. 2015;399:110-21 pubmed publisher
Trivedi A, Kumar J, Rani S, Kumar V. Annual life history-dependent gene expression in the hypothalamus and liver of a migratory songbird: insights into the molecular regulation of seasonal metabolism. J Biol Rhythms. 2014;29:332-45 pubmed publisher
..Thus, these findings promise new insights into the mechanism(s) of adaptation to seasons in higher vertebrates. ..
Kumar V, Wingfield J, Dawson A, Ramenofsky M, Rani S, Bartell P. Biological clocks and regulation of seasonal reproduction and migration in birds. Physiol Biochem Zool. 2010;83:827-35 pubmed publisher
..However, given that changes in environmental input affects the clock, increasing human disturbance of the environment is likely to adversely affect these systems. ..
Yadav G, Malik S, Rani S, Kumar V. Role of light wavelengths in synchronization of circadian physiology in songbirds. Physiol Behav. 2015;140:164-71 pubmed publisher
Majumdar G, Yadav G, Rani S, Kumar V. Bird eyes distinguish summer from winter: Retinal response to acute photoperiod change in the night-migratory redheaded bunting. J Chem Neuroanat. 2015;68:55-60 pubmed publisher
..These results for the first time show photoperiod-dependent molecular switches in the bunting retina, similar to the well documented thyroid hormone response genes based molecular cascades in the avian hypothalamus. ..
Rastogi A, Surbhi -, Malik S, Rani S, Kumar V. Annual life-history dependent seasonal differences in neural activity of the olfactory system between non-migratory and migratory songbirds. Behav Brain Res. 2016;296:233-239 pubmed publisher
..These results for the first time show LHS-associated differences in the seasonal plasticity of a sensory system between the non-migratory and migratory songbirds. ..
Trivedi A, Malik S, Rani S, Kumar V. Adaptation of oxidative phosphorylation to photoperiod-induced seasonal metabolic states in migratory songbirds. Comp Biochem Physiol A Mol Integr Physiol. 2015;184:34-40 pubmed publisher
..These results suggest the adaptation of oxidative phosphorylation pathway(s) at gene levels to the seasonal alternations in metabolism in migratory songbirds. ..
Singh D, Trivedi A, Rani S, Panda S, Kumar V. Circadian timing in central and peripheral tissues in a migratory songbird: dependence on annual life-history states. FASEB J. 2015;29:4248-55 pubmed publisher