Research Topics

Vinod Kumar

Summary

Publications

  1. 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. ..
  2. 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
  3. 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. ..
  4. 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. ..
  5. 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
  6. 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. ..
  7. 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. ..
  8. 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. ..
  9. 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

More Information

Publications16

  1. Trivedi A, Malik S, Rani S, Kumar V. Pinealectomy abolishes circadian behavior and interferes with circadian clock gene oscillations in brain and liver but not retina in a migratory songbird. Physiol Behav. 2016;156:156-63 pubmed publisher
    ..We suggest the pineal gland dependence of the generation of circadian gene oscillations in the hypothalamus, not retina, and peripheral brain and liver tissues in migratory redheaded buntings. ..
  2. Singh D, Trivedi N, Malik S, Rani S, Kumar V. Timed food availability affects circadian behavior but not the neuropeptide Y expression in Indian weaverbirds exposed to atypical light environment. Physiol Behav. 2016;161:81-89 pubmed publisher
    ..Overall, these results show that timed meal restores rhythmicity in individuals with circadian rhythm disruptions without involving neuropeptide Y, the key appetite regulatory molecule. ..
  3. Taufique S, Kumar V. Differential activation and tyrosine hydroxylase distribution in the hippocampal, pallial and midbrain brain regions in response to cognitive performance in Indian house crows exposed to abrupt light environment. Behav Brain Res. 2016;314:21-9 pubmed publisher
    ..These results show decreased activity of learning and memory neural systems, and underscore the role of dopamine in reduced cognitive performance of diurnal corvids with disrupted circadian rhythms under an abrupt light environment. ..
  4. Mishra I, Singh D, Kumar V. Temporal Expression of c-fos and Genes Coding for Neuropeptides and Enzymes of Amino Acid and Amine Neurotransmitter Biosynthesis in Retina, Pineal and Hypothalamus of a Migratory Songbird: Evidence for Circadian Rhythm-Dependent Seasonal Responses. Neuroscience. 2018;371:309-324 pubmed publisher
    ..These results underscore that circadian rhythm of peptide, amino acid and amine neurotransmitter biosynthesis in CPS plays a critical role in the photoperiodic regulation of seasonal states in birds. ..
  5. Mishra I, Bhardwaj S, Malik S, Kumar V. Concurrent hypothalamic gene expression under acute and chronic long days: Implications for initiation and maintenance of photoperiodic response in migratory songbirds. Mol Cell Endocrinol. 2017;439:81-94 pubmed publisher
  6. Agarwal N, Mishra I, Komal R, Rani S, Kumar V. Circannual testis and moult cycles persist under photoperiods that disrupt circadian activity and clock gene cycles in spotted munia. J Exp Biol. 2017;220:4162-4168 pubmed publisher
  7. Taufique S, Prabhat A, Kumar V. Constant light environment suppresses maturation and reduces complexity of new born neuron processes in the hippocampus and caudal nidopallium of a diurnal corvid: Implication for impairment of the learning and cognitive performance. Neurobiol Learn Mem. 2018;147:120-127 pubmed publisher