Priscila Tempaku1, Camila Hirotsu1,2, Diego Mazzotti3, Gabriela Xavier4,5, Pawan Maurya6,7, Elisa Brietzke6, Sintia Belangero4,5,6, Dalva Poyares1, Lia Bittencourt1, Sergio Tufik1. 1. Department of Psychobiology, Universidade Federal de São Paulo, São Paulo, Brazil. 2. Center for Investigation and Research in Sleep, Department of Internal Medicine, Lausanne University Hospital, Lausanne, Switzerland. 3. Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia. 4. LINC-Interdisciplinary Laboratory of Clinical Neurosciences, Universidade Federal de São Paulo, São Paulo, Brazil. 5. Department of Morphology and Genetics, Universidade Federal de São Paulo, São Paulo, Brazil. 6. Department of Psychiatry, Universidade Federal de São Paulo, São Paulo, Brazil. 7. Department of Biochemistry, Central University of Haryana, Mahendergarh, India.
Abstract
STUDY OBJECTIVES: We aimed to determine the association between short telomere length, sleep parameters, and sleep disorders in an adult general population sample. METHODS: As part of the EPISONO cohort (São Paulo, Brazil), 925 individuals answered questionnaires, underwent a full-night polysomnography and clinical assessment, and had peripheral blood collected for DNA extraction. Insomnia was diagnosed based on the Diagnostic and Statistical Manual of Mental Disorders, 4th edition; and obstructive sleep apnea was defined according to apnea-hypopnea index. For the objective insomnia phenotype, we combined insomnia diagnosis with total sleep time from polysomnography with a cutoff of 360 minutes, allowing the classification of six groups. Self-reported sleep duration was used to classify the individuals as short (< 6 hours), average (6 to 8 hours) and long (> 8 hours) sleepers. The leukocyte telomere length was measured using quantitative real-time polymerase chain reaction. Based on its distribution, we considered leukocyte telomere length < 10th percentile as short telomere and leukocyte telomere length ≥ 10th percentile as non-short telomere. RESULTS: After adjusting for sex, age, and body mass index, only insomnia disorder (odds ratio [OR] = 2.654, 95% confidence interval [CI] = 1.025-6.873, P = .044), insomnia disorder total sleep time < 360 minutes (OR = 4.205, 95% CI = 1.097-16.117, P = .036) and long sleepers (OR = 2.177, 95% CI = 1.189- 3.987, P = .012) were associated with short telomere. CONCLUSIONS: Our findings support the existence of an association among insomnia, insomnia phenotype, and self-reported long sleep duration with the maintenance of telomere length. COMMENTARY: A commentary on this article appears in this issue on page 1975.
STUDY OBJECTIVES: We aimed to determine the association between short telomere length, sleep parameters, and sleep disorders in an adult general population sample. METHODS: As part of the EPISONO cohort (São Paulo, Brazil), 925 individuals answered questionnaires, underwent a full-night polysomnography and clinical assessment, and had peripheral blood collected for DNA extraction. Insomnia was diagnosed based on the Diagnostic and Statistical Manual of Mental Disorders, 4th edition; and obstructive sleep apnea was defined according to apnea-hypopnea index. For the objective insomnia phenotype, we combined insomnia diagnosis with total sleep time from polysomnography with a cutoff of 360 minutes, allowing the classification of six groups. Self-reported sleep duration was used to classify the individuals as short (< 6 hours), average (6 to 8 hours) and long (> 8 hours) sleepers. The leukocyte telomere length was measured using quantitative real-time polymerase chain reaction. Based on its distribution, we considered leukocyte telomere length < 10th percentile as short telomere and leukocyte telomere length ≥ 10th percentile as non-short telomere. RESULTS: After adjusting for sex, age, and body mass index, only insomnia disorder (odds ratio [OR] = 2.654, 95% confidence interval [CI] = 1.025-6.873, P = .044), insomnia disorder total sleep time < 360 minutes (OR = 4.205, 95% CI = 1.097-16.117, P = .036) and long sleepers (OR = 2.177, 95% CI = 1.189- 3.987, P = .012) were associated with short telomere. CONCLUSIONS: Our findings support the existence of an association among insomnia, insomnia phenotype, and self-reported long sleep duration with the maintenance of telomere length. COMMENTARY: A commentary on this article appears in this issue on page 1975.
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