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https://www.readbyqxmd.com/read/28637897/heritability-of-resting-heart-rate-and-association-with-mortality-in-middle-aged-and-elderly-twins
#1
Magnus T Jensen, Mette Wod, Søren Galatius, Jacob B Hjelmborg, Gorm B Jensen, Kaare Christensen
OBJECTIVE: Resting heart rate (RHR) possibly has a hereditary component and is associated with longevity. We used the classical biometric twin study design to investigate the heritability of RHR in a population of middle-aged and elderly twins and, furthermore, studied the association between RHR and mortality. METHODS: In total, 4282 twins without cardiovascular disease were included from the Danish Twin Registry, hereof 1233 twin pairs and 1816 'single twins' (twins with a non-participating co-twin); mean age 61...
June 21, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28619249/metabolism-of-sex-steroids-is-influenced-by-acquired-adiposity-a-study-of-young-adult-male-monozygotic-twin-pairs
#2
Veera Vihma, Jussi Naukkarinen, Ursula Turpeinen, Esa Hämäläinen, Jaakko Kaprio, Aila Rissanen, Sini Heinonen, Antti Hakkarainen, Jesper Lundbom, Nina Lundbom, Tomi S Mikkola, Matti J Tikkanen, Kirsi H Pietiläinen
Obesity and ageing are associated with lower serum testosterone levels in men. How fat distribution or adipose tissue metabolism, independent of genetic factors and age, are related to sex steroid metabolism is less clear. We studied the associations between adiposity and serum sex hormone concentrations, and mRNA expression of genes regulating sex hormone metabolism in adipose tissue in young adult male monozygotic (MZ) twin pairs. The subjects [n=18 pairs; mean age, 32 years; individual body mass indexes (BMIs) 22-36kg/m(2)] included 9 male MZ twin pairs discordant for BMI [intra-pair difference (Δ) in BMI ≥3kg/m(2)]...
June 12, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28597337/brain-reward-responses-to-food-stimuli-among-female-monozygotic-twins-discordant-for-bmi
#3
Stieneke Doornweerd, Eco J De Geus, Frederik Barkhof, Liselotte Van Bloemendaal, Dorret I Boomsma, Jenny Van Dongen, Madeleine L Drent, Gonneke Willemsen, Dick J Veltman, Richard G IJzerman
Obese individuals are characterized by altered brain reward responses to food. Despite the latest discovery of obesity-associated genes, the contribution of environmental and genetic factors to brain reward responsiveness to food remains largely unclear. Sixteen female monozygotic twin pairs with a mean BMI discordance of 3.96 ± 2.1 kg/m(2) were selected from the Netherlands Twin Register to undergo functional MRI scanning while watching high- and low-calorie food and non-food pictures and during the anticipation and receipt of chocolate milk...
June 8, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28581026/cross-sectional-association-between-testosterone-sex-hormone-binding-globulin-and-metabolic-syndrome-the-healthy-twin-study
#4
Heesun Moon, Inyoung Choi, Somi Kim, Hyeonyoung Ko, Jinyoung Shin, Kayoung Lee, Joohon Sung, Yun-Mi Song
OBJECTIVES: This study evaluated an association between testosterone, sex hormone-binding globulin (SHBG) and metabolic syndrome (MetS).We also evaluated the genetic and environmental influence on the association. DESIGN: Cross-sectional. SETTING: Community-based study. PARTICIPANTS: A total of 1,098 Korean adult men including 139 monozygotic twin pairs. MAIN OUTCOME MEASURE: MetS was defined using the National Cholesterol Education Program-Third Adult Treatment Panel (NCEP-ATP III) and International Diabetes Federation (IDF) criteria...
June 5, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28575460/testing-familial-transmission-of-smoking-with-two-different-research-designs
#5
Jorien L Treur, Karin J H Verweij, Abdel Abdellaoui, Iryna O Fedko, Eveline L de Zeeuw, Erik A Ehli, Gareth E Davies, Jouke-Jan Hottenga, Gonneke Willemsen, Dorret I Boomsma, Jacqueline M Vink
Introduction: Classical twin studies show that smoking is heritable. To determine if shared family environment plays a role in addition to genetic factors, and if they interact (GxE), we use a children-of-twins design. In a second sample, we measure genetic influence with polygenic risk scores (PRS) and environmental influence with a question on exposure to smoking during childhood. Methods: Data on smoking initiation were available for 723 children of 712 twins from the Netherlands Twin Register (NTR;64...
June 1, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/28571031/perimortem-demonstration-and-treatment-of-recipient-to-donor-transfusion-in-monochorionic-diamniotic-twin-gestation
#6
Jessica Parrott, Tricia Schwartz, Tracy Cowles, Marium Holland, Carl P Weiner
Twin-twin transfusion syndrome is a complication of monochorionic-diamniotic placentation. Should one twin die, ≈30% of co-twins will also die, and if they survive, ≈30% experience severe morbidity rates, each believed secondary to hemorrhage of the co-twin into the deceased twin. We report apparently the first ultrasound-documented case of perimortem hemorrhage in twin-twin transfusion syndrome and its treatment by emergent ultrasound-guided percutaneous cord occlusion followed by percutaneous fetal intravascular transfusion...
June 2, 2017: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/28559893/upregulation-of-early-and-downregulation-of-terminal-pathway-complement-genes-in-subcutaneous-adipose-tissue-and-adipocytes-in-acquired-obesity
#7
Sanna Kaye, A Inkeri Lokki, Anna Hanttu, Eija Nissilä, Sini Heinonen, Antti Hakkarainen, Jesper Lundbom, Nina Lundbom, Lilli Saarinen, Olli Tynninen, Maheswary Muniandy, Aila Rissanen, Jaakko Kaprio, Seppo Meri, Kirsi H Pietiläinen
Inflammation is an important mediator of obesity-related complications such as the metabolic syndrome but its causes and mechanisms are unknown. As the complement system is a key mediator of inflammation, we studied whether it is activated in acquired obesity in subcutaneous adipose tissue (AT) and isolated adipocytes. We used a special study design of genetically matched controls of lean and heavy groups, rare monozygotic twin pairs discordant for body mass index (BMI) [n = 26, within-pair difference (Δ) in body mass index, BMI >3 kg/m(2)] with as much as 18 kg mean Δweight...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28557130/female-sexual-pain-epidemiology-and-genetic-overlap-with-chronic-widespread-pain
#8
A Burri, S Ogata, F Williams
BACKGROUND: Increased tender spots and lowered general pain thresholds have been observed in patients with dyspareunia. Based on this, the aim of the study was to compare the co-occurrence of female sexual pain across various pain populations and to further explore the aetiological structure underlying sexual pain by dissecting the genetic and environmental covariation among sexual pain, chronic widespread pain (CWP) and the previously reported psychological correlates of anxiety sensitivity and depression...
May 30, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28549776/methylome-and-transcriptome-profiling-in-myasthenia-gravis-monozygotic-twins
#9
Shimrat Mamrut, Nili Avidan, Frédérique Truffault, Elsebeth Staun-Ram, Tarek Sharshar, Bruno Eymard, Mélinée Frenkian, Jiri Pitha, Marc de Baets, Laurent Servais, Sonia Berrih-Aknin, Ariel Miller
OBJECTIVE: To identify novel genetic and epigenetic factors associated with Myasthenia gravis (MG) using an identical twins experimental study design. METHODS: The transcriptome and methylome of peripheral monocytes were compared between monozygotic (MZ) twins discordant and concordant for MG, as well as with MG singletons and healthy controls, all females. Sets of differentially expressed genes and differentially methylated CpGs were validated using RT-PCR for expression and target bisulfite sequencing for methylation on additional samples...
May 23, 2017: Journal of Autoimmunity
https://www.readbyqxmd.com/read/28535840/a-comparison-of-personality-life-events-comorbidity-and-health-in-monozygotic-twins-discordant-for-anorexia-nervosa
#10
Laura M Thornton, Sara E Trace, Kimberly A Brownley, Monica Ålgars, Suzanne E Mazzeo, Jocilyn E Bergin, Millie Maxwell, Paul Lichtenstein, Nancy L Pedersen, Cynthia M Bulik
Genetic and environmental factors contribute to the etiology of anorexia nervosa (AN). The co-twin control design is one of the most powerful methods available to evaluate environmental factors that could contribute to differences between monozygotic (MZ) twins who are discordant for AN. Using available data from a unique and rare sample of 22 Swedish female MZ pairs discordant for AN, we compared personality, life events, comorbidity, and health factors. Twins with AN had significantly higher perfectionism scores than unaffected co-twins and reported younger ages at first diet than unaffected co-twins who had dieted...
May 24, 2017: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
https://www.readbyqxmd.com/read/28527483/single-fetal-death-in-monochorionic-twin-pregnancy-co-twin-prognosis-and-neonatal-outcome
#11
Emídio Vale-Fernandes, Joana Dias, Belandina Gil, Alexandra Cadilhe
The incidence of single fetal death in twin pregnancy varies from 0.5% - 6.8%, leaving the surviving fetus with increased morbi-mortality. The prognosis is worse in monochorionic pregnancies. In addressing these cases it should be noted referral to tertiary center with differentiated perinatal support, induction of fetal lung maturation and termination of pregnancy if there's loss of fetal well-being or possibility of maternal complications and suspected neurological sequelae in the surviving fetus. The risk of iatrogenic prematurity should always be weighed with the possible consequences arising from the fetus staying in a hostile uterine environment...
February 27, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28498537/contagion-of-anxiety-symptoms-among-adolescent-siblings-a-twin-study
#12
Catherine Serra Poirier, Mara Brendgen, Frank Vitaro, Ginette Dionne, Michel Boivin
This study examined whether social contagion of anxiety symptoms is present between siblings during early adolescence and whether this process is moderated by sex, relationship quality, and zygosity. Based on 634 monozygotic and dizygotic twins (336 females) assessed in Grades 6 and 7, anxiety symptoms and sibling relationship quality were measured with self-report questionnaires. The predictive association of the co-twin's level of anxiety with adolescents' own increased anxiety 1 year later was only observed in same-sex twin dyads (monozygotic and dizygotic) and was higher for those who perceived a higher level of relationship quality with their co-twin...
March 2017: Journal of Research on Adolescence: the Official Journal of the Society for Research on Adolescence
https://www.readbyqxmd.com/read/28465822/does-the-sex-of-one-s-co-twin-affect-height-and-bmi-in-adulthood-a-study-of-dizygotic-adult-twins-from-31-cohorts
#13
Leonie H Bogl, Aline Jelenkovic, Eero Vuoksimaa, Linda Ahrenfeldt, Kirsi H Pietiläinen, Maria A Stazi, Corrado Fagnani, Cristina D'Ippolito, Yoon-Mi Hur, Hoe-Uk Jeong, Judy L Silberg, Lindon J Eaves, Hermine H Maes, Gombojav Bayasgalan, Danshiitsoodol Narandalai, Tessa L Cutler, Christian Kandler, Kerry L Jang, Kaare Christensen, Axel Skytthe, Kirsten O Kyvik, Wendy Cozen, Amie E Hwang, Thomas M Mack, Catherine A Derom, Robert F Vlietinck, Tracy L Nelson, Keith E Whitfield, Robin P Corley, Brooke M Huibregtse, Tom A McAdams, Thalia C Eley, Alice M Gregory, Robert F Krueger, Matt McGue, Shandell Pahlen, Gonneke Willemsen, Meike Bartels, Toos C E M van Beijsterveldt, Zengchang Pang, Qihua Tan, Dongfeng Zhang, Nicholas G Martin, Sarah E Medland, Grant W Montgomery, Jacob V B Hjelmborg, Esther Rebato, Gary E Swan, Ruth Krasnow, Andreas Busjahn, Paul Lichtenstein, Sevgi Y Öncel, Fazil Aliev, Laura A Baker, Catherine Tuvblad, Sisira H Siribaddana, Matthew Hotopf, Athula Sumathipala, Fruhling Rijsdijk, Patrik K E Magnusson, Nancy L Pedersen, Anna K Dahl Aslan, Juan R Ordoñana, Juan F Sánchez-Romera, Lucia Colodro-Conde, Glen E Duncan, Dedra Buchwald, Adam D Tarnoki, David L Tarnoki, Yoshie Yokoyama, John L Hopper, Ruth J F Loos, Dorret I Boomsma, Thorkild I A Sørensen, Karri Silventoinen, Jaakko Kaprio
BACKGROUND: The comparison of traits in twins from opposite-sex (OS) and same-sex (SS) dizygotic twin pairs is considered a proxy measure of prenatal hormone exposure. To examine possible prenatal hormonal influences on anthropometric traits, we compared mean height, body mass index (BMI), and the prevalence of being overweight or obese between men and women from OS and SS dizygotic twin pairs. METHODS: The data were derived from the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins) database, and included 68,494 SS and 53,808 OS dizygotic twin individuals above the age of 20 years from 31 twin cohorts representing 19 countries...
2017: Biology of Sex Differences
https://www.readbyqxmd.com/read/28444780/fetal-brain-injury-in-complicated-monochorionic-pregnancies-diagnostic-yield-of-prenatal-mri-following-surveillance-ultrasound-and-influence-on-prognostic-counselling
#14
Alice Robinson, Mark Teoh, Andrew Edwards, Michael Fahey, Stacy Goergen
OBJECTIVE: This study aimed to determine the additional diagnostic information provided by prenatal (fetal) magnetic resonance imaging (pMRI) following tertiary ultrasound (US) for fetal cranial abnormalities in complicated monochorionic gestations. METHODS: Women with complicated monochorionic gestations complicated by twin-twin transfusion syndrome, co-twin demise (CD), selective intrauterine growth restriction, and/or twin anaemia-polycythaemia sequence who were referred for pMRI after tertiary US were included...
April 26, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28439093/gene-expression-profile-of-subcutaneous-adipose-tissue-in-bmi-discordant-monozygotic-twin-pairs-unravels-molecular-and-clinical-changes-associated-with-sub-types-of-obesity
#15
M Muniandy, S Heinonen, H Yki-Järvinen, A Hakkarainen, J Lundbom, N Lundbom, J Kaprio, A Rissanen, M Ollikainen, K H Pietiläinen
BACKGROUND: Subcutaneous adipose tissue (SAT) undergoes major changes in obesity, but little is known about the whole-genome scale patterns of these changes or about their variation between different obesity subgroups. We sought to compare how transcriptomics profiles in SAT differ between monozygotic (MZ) co-twins who are discordant for body mass index (BMI), whether the profiles vary between twin pairs and whether the variation can be linked to clinical characteristics. METHODS: We analyzed the transcriptomics (Affymetrix U133 Plus 2...
April 25, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28436347/familiality-and-heritability-of-fatigue-in-an-australian-twin-sample
#16
Elizabeth C Corfield, Nicholas G Martin, Dale R Nyholt
Familial factors have previously been implicated in the etiology of fatigue, of which a significant proportion is likely attributable to genetic influences. However, family studies have primarily focused on chronic fatigue syndrome, while univariate twin studies have investigated broader fatigue phenotypes. The results for similar fatigue phenotypes vary between studies, particularly with regard to sex-specific contributions to the heritability of the traits. Therefore, the current study aims to investigate the familiality and sex-specific effects of fatigue experienced over the past few weeks in an older Australian population of 660 monozygotic (MZ) twin pairs, 190 MZ singleton twins, 593 dizygotic (DZ) twin pairs, and 365 DZ singleton twins...
April 24, 2017: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
https://www.readbyqxmd.com/read/28397623/differences-in-neural-and-cognitive-response-to-emotional-faces-in-middle-aged-dizygotic-twins-at-familial-risk-of-depression
#17
K W Miskowiak, A M B Svendsen, C J Harmer, R Elliott, J Macoveanu, H R Siebner, L V Kessing, M Vinberg
BACKGROUND: Negative bias and aberrant neural processing of emotional faces are trait-marks of depression but findings in healthy high-risk groups are conflicting. METHODS: Healthy middle-aged dizygotic twins (N = 42) underwent functional magnetic resonance imaging (fMRI): 22 twins had a co-twin history of depression (high-risk) and 20 were without co-twin history of depression (low-risk). During fMRI, participants viewed fearful and happy faces while performing a gender discrimination task...
April 11, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28382888/placental-restriction-in-multi-fetal-pregnancies-and-between-twin-differences-in-size-at-birth-alter-neonatal-feeding-behaviour-in-the-sheep
#18
R F Peter, J Gugusheff, A L Wooldridge, K L Gatford, B S Muhlhausler
Most individuals whose growth was restricted before birth undergo accelerated or catch-up neonatal growth. This is an independent risk factor for later metabolic disease, but the underlying mechanisms are poorly understood. This study aimed to test the hypothesis that natural and experimentally induced in utero growth restriction increase neonatal appetite and milk intake. Control (CON) and placentally restricted (PR) ewes carrying multiple fetuses delivered naturally at term. Outcomes were compared between CON (n=14) and PR (n=12) progeny and within twin lamb pairs...
June 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28378228/inflammatory-processes-and-schizophrenia-two-independent-lines-of-evidence-from-a-study-of-twins-discordant-and-concordant-for-schizophrenic-disorders
#19
Silke Braun, René Bridler, Norbert Müller, Markus J Schwarz, Erich Seifritz, Matthias Weisbrod, Alexandra Zgraggen, Hans H Stassen
The concept of twin concordance involves quantifying the resemblance between co-twins in an "objective" and reproducible way. Yet, quantifying resemblance in the case of complex psychiatric traits like schizophrenic disorders leads to methodological problems, as the yes-no dichotomy of diagnostic schemata does not allow one to assess between-subject differences in psychopathology patterns sufficiently accurately. Therefore, we relied on a multidimensional, quantitative concordance measure that provided a high resolution and differentiation when assessing the resemblance of psychopathology patterns...
April 4, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28369107/mapping-the-association-between-back-pain-and-type-2-diabetes-a-cross-sectional-and-longitudinal-study-of-adult-spanish-twins
#20
Amabile Dario, Manuela Ferreira, Kathryn Refshauge, Alison Harmer, Juan Sánchez-Romera, Francisco Pérez-Riquelme, Ligia Cisneros, Juan Ordoñana, Paulo Ferreira
BACKGROUND: Back pain and type 2 diabetes often co-occur, resulting in greater impact on people's health and complexity in their care. Plausible causal mechanisms for this association have been proposed, yet the nature of the link remains unclear. We therefore explored the direction of the association between type 2 diabetes and chronic back pain in twins, controlling for genetics and early environmental confounding. METHODS: 2,096 and 1,098 twins were included in the cross-sectional and longitudinal analyses, respectively...
2017: PloS One
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