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      Interactions betweenRAD51rs1801321 and maternal cigarette smoking as risk factor for nonsyndromic cleft lip with or without cleft palate : Interactions betweenRAD51rs1801321 and maternal

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          Unraveling human cleft lip and palate research.

          The focus of this work is to highlight the most recent advances in the understanding of cleft lip and palate occurrence. Information regarding research on long-term outcomes, genes and their interactions with other genes, and gene-environment interactions is compiled to provide the reader with a critical and up-to-date overview on the current knowledge of the etiology of cleft lip and palate. Recent epidemiological evidence strongly suggests that individuals born with clefts have a shorter lifespan and may have a higher incidence of cancer and psychological disorders. IRF6 has been shown to be an important contributor to cleft lip and palate, but the functional variant leading to the defect has not yet been defined. Inactivation of MSX1 and genes in the FGF family has also been shown to lead to cleft lip and palate. In addition, missense mutations in several candidate genes may cause cleft lip and palate, but definitive evidence regarding the biological consequences of these mutations is yet to be unraveled. Maternal cigarette smoking increases the risk of a baby born with clefts, in particular when the mother carries the GSTT1-null variants. The latest approaches in cleft research include the analysis of several additional phenotypical features of the population, with the goal of increasing the statistical power of genetics studies.
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            Maternal corticosteroid use and orofacial clefts.

            The purpose of this study was to examine whether maternal corticosteroid use during pregnancy is associated with delivering an infant with an orofacial cleft. This study included data on deliveries from the National Birth Defects Prevention Study, which is a population-based case-control study. Exposures were assessed by telephone interviews for mothers of 1141 cases with cleft lip +/- cleft palate (CLP), 628 with cleft palate (CP), and 4143 controls. Mothers of 33 infants with CLP (2.9%), mothers of 6 infants with CP (1.0%), and 72 control subjects (1.7%) reported corticosteroid use from 4 weeks before through 12 weeks after conception. The crude odds ratio for "any" vs "no" use was 1.7 (95% CI, 1.1-2.6) for CLP and 0.5 (0.2-1.3) for CP. When analyzed by route of administration and medication components, odds ratios for CLP tended to be elevated, and odds ratios for CP tended to be close to 1. Our results suggest a moderately increased risk of CLP among women who use corticosteroids during early pregnancy.
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              DNA repair in mammalian embryos.

              Mammalian cells have developed complex mechanisms to identify DNA damage and activate the required response to maintain genome integrity. Those mechanisms include DNA damage detection, DNA repair, cell cycle arrest and apoptosis which operate together to protect the conceptus from DNA damage originating either in parental gametes or in the embryo's somatic cells. DNA repair in the newly fertilized preimplantation embryo is believed to rely entirely on the oocyte's machinery (mRNAs and proteins deposited and stored prior to ovulation). DNA repair genes have been shown to be expressed in the early stages of mammalian development. The survival of the embryo necessitates that the oocyte be sufficiently equipped with maternal stored products and that embryonic gene expression commences at the correct time. A Medline based literature search was performed using the keywords 'DNA repair' and 'embryo development' or 'gametogenesis' (publication dates between 1995 and 2006). Mammalian studies which investigated gene expression were selected. Further articles were acquired from the citations in the articles obtained from the preliminary Medline search. This paper reviews mammalian DNA repair from gametogenesis to preimplantation embryos to late gestational stages.
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                Author and article information

                Journal
                American Journal of Medical Genetics Part A
                Am. J. Med. Genet.
                Wiley-Blackwell
                15524825
                February 2016
                February 2016
                : 170
                : 2
                : 536-539
                Article
                10.1002/ajmg.a.37281
                9d7596d9-d1c8-4f67-ace3-ff0456c5498a
                © 2016

                http://doi.wiley.com/10.1002/tdm_license_1.1

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