| Clarifying the role of sleep in depression: A narrative review MN SR Pandi-Perumal, JM Monti, D Burman, R Karthikeyan, AS BaHammam, DW ... Psychiatry Research 291, 113239, 2020 | 154 | 2020 |
| The eIF2α kinase GCN2 modulates period and rhythmicity of the circadian clock by translational control of Atf4 SS Pathak, D Liu, T Li, N de Zavalia, L Zhu, J Li, R Karthikeyan, T Alain, ... Neuron 104 (4), 724-735. e6, 2019 | 59 | 2019 |
| Should we listen to our clock to prevent type 2 diabetes mellitus? R Karthikeyan, G Marimuthu, DW Spence, SR Pandi-Perumal, ... Diabetes research and clinical practice 106 (2), 182-190, 2014 | 56 | 2014 |
| Association of Per3 length polymorphism with bipolar I disorder and schizophrenia. R Karthikeyan, G Marimuthu, C Ramasubramanian, G Arunachal, ... Neuropsychiatric Disease and Treatment 2014 (10), 2325—2330, 2014 | 46 | 2014 |
| Biological timing and neurodevelopmental disorders: a role for circadian dysfunction in autism spectrum disorders E Lorsung, R Karthikeyan, R Cao Frontiers in Neuroscience 15, 642745, 2021 | 37 | 2021 |
| Per3 length polymorphism in patients with type 2 diabetes mellitus R Karthikeyan, G Marimuthu, M Sooriyakumar, AS BaHammam, ... Hormone molecular biology and clinical investigation 18 (3), 145-149, 2014 | 27 | 2014 |
| Autism spectrum disorder patients may be susceptible to COVID-19 disease due to deficiency in melatonin GM Brown, R Karthikeyan, SR Pandi-Perumal, DP Cardinali Medical hypotheses 149, 110544, 2021 | 20 | 2021 |
| Timing is everything: Circadian rhythms and their role in the control of sleep SR Pandi-Perumal, DP Cardinali, NFW Zaki, R Karthikeyan, DW Spence, ... Frontiers in neuroendocrinology 66, 100978, 2022 | 18 | 2022 |
| Understanding the role of sleep and its disturbances in autism spectrum disorder R Karthikeyan, DP Cardinali, V Shakunthala, DW Spence, GM Brown, ... International Journal of Neuroscience 130 (10), 1033-1046, 2020 | 16 | 2020 |
| Basic chronobiology: what do sleep physicians need to know? RK NFW Zaki, DW Spence, P Subramanian, VK Bharti, ... Sleep Science, DOI: 10.5935/1984-0063.20200026, 2020 | 15* | 2020 |
| Disruption of circadian rhythms by ambient light during neurodevelopment leads to autistic-like molecular and behavioral alterations in adult mice K Fang, D Liu, SS Pathak, B Yang, J Li, R Karthikeyan, OY Chao, ... Cells 10 (12), 3314, 2021 | 13 | 2021 |
| Neuropsychiatric consequences of COVID-19 pandemic: a synthetic review from a global perspective SR Pandi-Perumal, NFW Zaki, M Qasim, NE Morsy, MD Manzar, ... Alpha Psychiatry 23 (4), 144, 2022 | 11 | 2022 |
| The contribution of modern 24-hour society to the development of type 2 diabetes mellitus: the role of insufficient sleep R Karthikeyan, DW Spence, SR Pandi-Perumal Sleep Science 12 (3), 227, 2019 | 7 | 2019 |
| Are Type 2 Diabetes Mellitus and Depression Part of a Common Clock Genes Network? Ramanujam Karthikeyan, David Warren Spence, Gregory M. Brown, Seithikurippu ... Journal of Circadian Rhtyhms 16 (1), 4, 2018 | 7* | 2018 |
| Non-image-forming functional roles of OPN3, OPN4 and OPN5 photopigments R Karthikeyan, WIL Davies, L Gunhaga Journal of Photochemistry and Photobiology 15, 100177, 2023 | 4 | 2023 |
| Importance of biological clock in the prevalence and management of type 2 diabetes R Karthikeyan Sarvodhaya Talisman, 13-17, 2015 | | 2015 |
| Molecular genetic aspects of circadian clock in psychiatric and metabolic disorder putative role for period3 gene R Karthikeyan Ph D Thesis, 2014 | | 2014 |
| Book review: The Moon and Madness by Niall McCrae R Karthikeyan Journal of Scientific Exploration 26, 189-192, 2012 | | 2012 |
