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karla allebrandt

Karla V Allebrandt, Maris Teder-Laving, Paola Cusumano, Goar Frishman, Rosa Levandovski, Andreas Ruepp, Maria P L Hidalgo, Rodolfo Costa, Andres Metspalu, Till Roenneberg, Cristiano De Pittà
Recognizing that insights into the modulation of sleep duration can emerge by exploring the functional relationships among genes, we used this strategy to explore the genome-wide association results for this trait. We detected two major signalling pathways (ion channels and the ERBB signalling family of tyrosine kinases) that could be replicated across independent GWA studies meta-analyses. To investigate the significance of these pathways for sleep modulation, we performed transcriptome analyses of short sleeping flies' heads (knockdown for the ABCC9 gene homolog; dSur)...
July 4, 2017: Scientific Reports
Francesca Frau, Daniel Crowther, Hartmut Ruetten, Karla V Allebrandt
Genome-wide association studies (GWAs) for type 2 diabetes (T2D) have been successful in identifying many loci with robust association signals. Nevertheless, there is a clear need for post-GWAs strategies to understand mechanism of action and clinical relevance of these variants. The association of several comorbidities with T2D suggests a common etiology for these phenotypes and complicates the management of the disease. In this study, we focused on the genetics underlying these relationships, using systems genomics to identify genetic variation associated with T2D and 12 other traits...
March 22, 2017: Molecular Genetics and Metabolism
Samuel E Jones, Jessica Tyrrell, Andrew R Wood, Robin N Beaumont, Katherine S Ruth, Marcus A Tuke, Hanieh Yaghootkar, Youna Hu, Maris Teder-Laving, Caroline Hayward, Till Roenneberg, James F Wilson, Fabiola Del Greco, Andrew A Hicks, Chol Shin, Chang-Ho Yun, Seung Ku Lee, Andres Metspalu, Enda M Byrne, Philip R Gehrman, Henning Tiemeier, Karla V Allebrandt, Rachel M Freathy, Anna Murray, David A Hinds, Timothy M Frayling, Michael N Weedon
Disrupted circadian rhythms and reduced sleep duration are associated with several human diseases, particularly obesity and type 2 diabetes, but until recently, little was known about the genetic factors influencing these heritable traits. We performed genome-wide association studies of self-reported chronotype (morning/evening person) and self-reported sleep duration in 128,266 white British individuals from the UK Biobank study. Sixteen variants were associated with chronotype (P<5x10-8), including variants near the known circadian rhythm genes RGS16 (1...
August 2016: PLoS Genetics
Najaf Amin, Karla V Allebrandt, Ashley van der Spek, Bertram Müller-Myhsok, Karin Hek, Maris Teder-Laving, Caroline Hayward, Tõnu Esko, Josine G van Mill, Hamdi Mbarek, Nathaniel F Watson, Scott A Melville, Fabiola M Del Greco, Enda M Byrne, Edwin Oole, Ivana Kolcic, Ting-Hsu Chen, Daniel S Evans, Josef Coresh, Nicole Vogelzangs, Juha Karjalainen, Gonneke Willemsen, Sina A Gharib, Lina Zgaga, Evelin Mihailov, Katie L Stone, Harry Campbell, Rutger Ww Brouwer, Ayse Demirkan, Aaron Isaacs, Zoran Dogas, Kristin D Marciante, Susan Campbell, Fran Borovecki, Annemarie I Luik, Man Li, Jouke Jan Hottenga, Jennifer E Huffman, Mirjam Cgn van den Hout, Steven R Cummings, Yurii S Aulchenko, Philip R Gehrman, André G Uitterlinden, Heinz-Erich Wichmann, Martina Müller-Nurasyid, Rudolf Sn Fehrmann, Grant W Montgomery, Albert Hofman, Wen Hong Linda Kao, Ben A Oostra, Alan F Wright, Jacqueline M Vink, James F Wilson, Peter P Pramstaller, Andrew A Hicks, Ozren Polasek, Naresh M Punjabi, Susan Redline, Bruce M Psaty, Andrew C Heath, Martha Merrow, Gregory J Tranah, Daniel J Gottlieb, Dorret I Boomsma, Nicholas G Martin, Igor Rudan, Henning Tiemeier, Wilfred Fj van IJcken, Brenda W Penninx, Andres Metspalu, Thomas Meitinger, Lude Franke, Till Roenneberg, Cornelia M van Duijn
Time to fall asleep (sleep latency) is a major determinant of sleep quality. Chronic, long sleep latency is a major characteristic of sleep-onset insomnia and/or delayed sleep phase syndrome. In this study we aimed to discover common polymorphisms that contribute to the genetics of sleep latency. We performed a meta-analysis of genome-wide association studies (GWAS) including 2 572 737 single nucleotide polymorphisms (SNPs) established in seven European cohorts including 4242 individuals. We found a cluster of three highly correlated variants (rs9900428, rs9907432 and rs7211029) in the RNA-binding protein fox-1 homolog 3 gene (RBFOX3) associated with sleep latency (P-values=5...
October 2016: European Journal of Human Genetics: EJHG
Karla V Allebrandt, Maris Teder-Laving, Thomas Kantermann, Annette Peters, Harry Campbell, Igor Rudan, James F Wilson, Andres Metspalu, Till Roenneberg
Little is known about human entrainment under natural conditions, partly due to the complexity of human behavior, torn between biological and social time and influenced by zeitgebers (light-dark cycles) that are progressively "polluted" (and thereby weakened) by artificial light. In addition, data about seasonal variations in sleep parameters are scarce. We, therefore, investigated seasonal variation in cross-sectional assessments of sleep/wake times of 9765 subjects from four European populations (EGCUT = Estonian Genome Centre, University of Tartu in Estonia; KORA = Cooperative Health Research in the Region of Augsburg in Germany; KORCULA = The Korcula study in Croatia; and ORCADES = The Orkney Complex Disease Study in Scotland)...
June 2014: Chronobiology International
Till Roenneberg, Thomas Kantermann, Myriam Juda, Céline Vetter, Karla V Allebrandt
The circadian clock can only reliably fulfil its function if it is stably entrained. Most clocks use the light-dark cycle as environmental signal (zeitgeber) for this active synchronisation. How we think about clock function and entrainment has been strongly influenced by the early concepts of the field's pioneers, and the astonishing finding that circadian rhythms continue a self-sustained oscillation in constant conditions has become central to our understanding of entrainment.Here, we argue that we have to rethink these initial circadian dogmas to fully understand the circadian programme and how it entrains...
2013: Handbook of Experimental Pharmacology
May Trude Johnsen, Rolf Wynn, Karla Allebrandt, Trond Bratlid
OBJECTIVE: Sleep timing and duration are influenced by outdoor light, but few studies have addressed these relationships in subarctic populations. We aimed to investigate how the extreme photic environment at 69 degrees north, with absence of daylight for 2months in the winter and constant light for 2months in the summer, would affect the sleep-wake rhythm. METHODS: 4811 people ages 35-70years, from the cross sectional study 'Tromsø 6' responded to the Munich Chronotype Questionnaire, in addition to socio-demographic and health-related information...
February 2013: Sleep Medicine
Till Roenneberg, Karla V Allebrandt, Martha Merrow, Céline Vetter
Obesity has reached crisis proportions in industrialized societies. Many factors converge to yield increased body mass index (BMI). Among these is sleep duration. The circadian clock controls sleep timing through the process of entrainment. Chronotype describes individual differences in sleep timing, and it is determined by genetic background, age, sex, and environment (e.g., light exposure). Social jetlag quantifies the discrepancy that often arises between circadian and social clocks, which results in chronic sleep loss...
May 22, 2012: Current Biology: CB
Márcia Lacerda De Medeiros Schneider, Denise Camargo Vasconcellos, Giovana Dantas, Rosa Levandovski, Wolnei Caumo, Karla V Allebrandt, Marlene Doring, Maria Paz Loayza Hidalgo
Morningness-eveningness dimension in humans have been indicated to influence social behavior and individual health. The aim of the present study was to investigate the association of the morningness-eveningness dimension with behavioral and health aspects in a sample of undergraduate students. We assessed demographic data; the Pittsburgh Sleep Quality Index was used to evaluate sleep quality; the Morningness/Eveningness Questionnaire to determine morningness-eveningness, and the Self-Reporting Questionnaire to assess minor psychiatric disorders...
February 1, 2011: International Journal of Psychology: Journal International de Psychologie
Rosa Levandovski, Giovana Dantas, Luciana Carvalho Fernandes, Wolnei Caumo, Iraci Torres, Till Roenneberg, Maria Paz Loayza Hidalgo, Karla Viviani Allebrandt
In public health, mood disorders are among the most important mental impairments. Patients with depressive episodes exhibit daily mood variations, abnormal patterns in sleep-wake behavior, and in the daily rhythms of several endocrine-metabolic parameters. Although the relationship between the sleep/circadian processes and mood disorders is poorly understood, clock-related therapies, such as light therapy, sleep deprivation, and rigid sleep schedules, have been shown to be effective treatments. Several studies investigated the relationship between circadian phenotype (chronotype) and depression...
November 2011: Chronobiology International
Karla V Allebrandt, Maris Teder-Laving, Mahmut Akyol, Irene Pichler, Bertram Müller-Myhsok, Peter Pramstaller, Martha Merrow, Thomas Meitinger, Andreas Metspalu, Till Roenneberg
BACKGROUND: Sleep is an active and complex behavior, yet it has two straightforward properties-timing and duration. Clock genes are associated with dysfunctional timing of sleep, mood, and obesity disorders, which are commonly associated with sleep duration. METHODS: Sleep duration was assessed in Central Europe, Estonia, and South Tyrol (n approximately 77,000) with the Munich ChronoType Questionnaire. It showed a Gaussian distribution in all investigated populations after averaging over a standard workweek and normalization according to age and gender...
June 1, 2010: Biological Psychiatry
Till Roenneberg, Tim Kuehnle, Myriam Juda, Thomas Kantermann, Karla Allebrandt, Marijke Gordijn, Martha Merrow
Humans show large inter-individual differences in organising their behaviour within the 24-h day-this is most obvious in their preferred timing of sleep and wakefulness. Sleep and wake times show a near-Gaussian distribution in a given population, with extreme early types waking up when extreme late types fall asleep. This distribution is predominantly based on differences in an individuals' circadian clock. The relationship between the circadian system and different "chronotypes" is formally and genetically well established in experimental studies in organisms ranging from unicells to mammals...
December 2007: Sleep Medicine Reviews
Karla V Allebrandt, Valmiki Rajesh, Paul G Layer
In zebrafish, the onset of acetylcholinesterase (AChE) expression was detected by RT-PCR at 4 hpf (hours post-fertilization). The aryl acylamidase (AAA) associated with AChE, a serotonin sensitive activity with unknown physiological function, was significantly higher than the esterase activity on zebrafish embryos homogenates at 4-12 h development (test-t = 3.523; d.f. = 4). Remarkably, the ratio of AAA/AChE activity decreased 210-fold from 4 to 144 h development, indicating a distinct embryonic role of AAA during early embryogenesis...
December 15, 2005: Chemico-biological Interactions
Ricardo L R Souza, Cyntia Fadel-Picheth, Karla V Allebrandt, Lupe Furtado, Eleidi A Chautard-Freire-Maia
Butyrylcholinesterase activity has been shown to be positively associated with weight and body mass index (BMI). The present study was carried out to search for an association between variants of the BCHE gene and weight, stature, and BMI on the basis of means and variances compared between nonusual variants and their respective usual controls. Individuals bearing the atypical mutation (N = 52) did not differ from their usual phenotype controls (N = 104) in these parameters. The BCHE*U/BCHE*K individuals (N = 222) presented a significantly higher BMI variance than their BCHE*U/BCHE*U controls (N = 222, F = 1...
March 2005: American Journal of Physical Anthropology
Karla V Allebrandt, Ricardo L R Souza, Eleidi A Chautard-Freire-Maia
The human high-density lipoprotein-associated paraoxonase (EC; PON1) plays a role in the hydrolysis of organophosphorus compounds and against the oxidative damage of low-density lipoprotein. In the present study, variants of PON1 (55 and 192) were investigated by PCR-RFLP and PCR-SSCA in Euro- (N = 101) and Afro-Brazilians (N = 70). The PON1*55 and PON1*192 allele frequencies were significantly different in these ethnic groups (p < 0.05 and p < 0.001, respectively). The genotype frequencies for PON1*55 (LL, LM, and MM) in Euro- and Afro-Brazilians were 33, 56, and 11% and 47, 49, and 4%, respectively...
May 1, 2002: Toxicology and Applied Pharmacology
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