@article {10558, title = {CYP3A genes and the association between prenatal methylmercury exposure and neurodevelopment.}, journal = {Environ Int}, volume = {105}, year = {2017}, month = {2017 08}, pages = {34-42}, abstract = {

BACKGROUND: Results on the association between prenatal exposure to methylmercury (MeHg) and child neuropsychological development are heterogeneous. Underlying genetic differences across study populations could contribute to this varied response to MeHg. Studies in Drosophila have identified the cytochrome p450 3A (CYP3A) family as candidate MeHg susceptibility genes.

OBJECTIVES: We evaluated whether genetic variation in CYP3A genes influences the association between prenatal exposure to MeHg and child neuropsychological development.

METHODS: The study population included 2639 children from three birth cohort studies: two subcohorts in Seychelles (SCDS) (n=1160, 20 and 30months of age, studied during the years 2001-2012), two subcohorts from Spain (INMA) (n=625, 14months of age, 2003-2009), and two subcohorts from Italy and Greece (PHIME) (n=854, 18months of age, 2006-2011). Total mercury, as a surrogate of MeHg, was analyzed in maternal hair and/or cord blood samples. Neuropsychological development was evaluated using Bayley Scales of Infant Development (BSID). Three functional polymorphisms in the CYP3A family were analyzed: rs2257401 (CYP3A7), rs776746 (CYP3A5), and rs2740574 (CYP3A4).

RESULTS: There was no association between CYP3A polymorphisms and cord mercury concentrations. The scores for the BSID mental scale improved with increasing cord blood mercury concentrations for carriers of the most active alleles (β[95\% CI]:=2.9[1.53,4.27] for CYP3A7 rs2257401 GG+GC, 2.51[1.04,3.98] for CYP3A5 rs776746 AA+AG and 2.31[0.12,4.50] for CYP3A4 rs2740574 GG+AG). This association was near the null for CYP3A7 CC, CYP3A5 GG and CYP3A4 AA genotypes. The interaction between the CYP3A genes and total mercury was significant (p<0.05) in European cohorts only.

CONCLUSIONS: Our results suggest that the polymorphisms in CYP3A genes may modify the response to dietary MeHg exposure during early life development.

}, keywords = {Adult, Child Development, Child, Preschool, Cohort Studies, Cytochrome P-450 CYP3A, Female, Fetal Blood, Genotype, Greece, Humans, Infant, Italy, Male, Mercury, Methylmercury Compounds, Neurodevelopmental Disorders, Neuropsychological Tests, Polymorphism, Genetic, Pregnancy, Prenatal Exposure Delayed Effects, Seychelles, Spain}, issn = {1873-6750}, doi = {10.1016/j.envint.2017.04.013}, author = {Llop, Sabrina and Tran, Van and Ballester, Ferran and Barbone, Fabio and Sofianou-Katsoulis, Aikaterini and Sunyer, Jordi and Engstr{\"o}m, Karin and Alhamdow, Ayman and Love, Tanzy M and Watson, Gene E and Bustamante, Mariona and Murcia, Mario and I{\~n}iguez, Carmen and Shamlaye, Conrad F and Rosolen, Valentina and Mariuz, Marika and Horvat, Milena and Tratnik, Janja S and Mazej, Darja and van Wijngaarden, Edwin and Davidson, Philip W and Myers, Gary J and Rand, Matthew D and Broberg, Karin} } @article {3639, title = {Genome-wide association study of sexual maturation in males and females highlights a role for body mass and menarche loci in male puberty.}, journal = {Hum Mol Genet}, volume = {23}, year = {2014}, month = {2014 Aug 15}, pages = {4452-64}, abstract = {

Little is known about genes regulating male puberty. Further, while many identified pubertal timing variants associate with age at menarche, a late manifestation of puberty, and body mass, little is known about these variants{\textquoteright} relationship to pubertal initiation or tempo. To address these questions, we performed genome-wide association meta-analysis in over 11 000 European samples with data on early pubertal traits, male genital and female breast development, measured by the Tanner scale. We report the first genome-wide significant locus for male sexual development upstream of myocardin-like 2 (MKL2) (P = 8.9 {\texttimes} 10(-9)), a menarche locus tagging a developmental pathway linking earlier puberty with reduced pubertal growth (P = 4.6 {\texttimes} 10(-5)) and short adult stature (p = 7.5 {\texttimes} 10(-6)) in both males and females. Furthermore, our results indicate that a proportion of menarche loci are important for pubertal initiation in both sexes. Consistent with epidemiological correlations between increased prepubertal body mass and earlier pubertal timing in girls, body mass index (BMI)-increasing alleles correlated with earlier breast development. In boys, some BMI-increasing alleles associated with earlier, and others with delayed, sexual development; these genetic results mimic the controversy in epidemiological studies, some of which show opposing correlations between prepubertal BMI and male puberty. Our results contribute to our understanding of the pubertal initiation program in both sexes and indicate that although mechanisms regulating pubertal onset in males and females may largely be shared, the relationship between body mass and pubertal timing in boys may be complex and requires further genetic studies.

}, issn = {1460-2083}, doi = {10.1093/hmg/ddu150}, author = {Cousminer, Diana L and Stergiakouli, Evangelia and Berry, Diane J and Ang, Wei and Groen-Blokhuis, Maria M and K{\"o}rner, Antje and Siitonen, Niina and Ntalla, Ioanna and Marinelli, Marcella and Perry, John R B and Kettunen, Johannes and Jansen, Rick and Surakka, Ida and Timpson, Nicholas J and Ring, Susan and McMahon, George and Power, Chris and Wang, Carol and K{\"a}h{\"o}nen, Mika and Viikari, Jorma and Lehtim{\"a}ki, Terho and Middeldorp, Christel M and Hulshoff Pol, Hilleke E and Neef, Madlen and Weise, Sebastian and Pahkala, Katja and Niinikoski, Harri and Zeggini, Eleftheria and Panoutsopoulou, Kalliope and Bustamante, Mariona and Penninx, Brenda W J H and Murabito, Joanne and Torrent, Maties and Dedoussis, George V and Kiess, Wieland and Boomsma, Dorret I and Pennell, Craig E and Raitakari, Olli T and Hypp{\"o}nen, Elina and Davey Smith, George and Ripatti, Samuli and McCarthy, Mark I and Widen, Elisabeth} }