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Male Reproductive Disorders and Fertility Trends: Influences of Environment and Genetic Susceptibility

Physiological reviews, 2016-01, Vol.96 (1), p.55-97 [Peer Reviewed Journal]

Copyright © 2016 the American Physiological Society. ;Copyright © 2016 the American Physiological Society 2016 American Physiological Society ;ISSN: 0031-9333 ;EISSN: 1522-1210 ;DOI: 10.1152/physrev.00017.2015 ;PMID: 26582516 ;CODEN: PHREA7

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Title:
Male Reproductive Disorders and Fertility Trends: Influences of Environment and Genetic Susceptibility
Author: Skakkebaek, Niels E ; Rajpert-De Meyts, Ewa ; Buck Louis, Germaine M ; Toppari, Jorma ; Andersson, Anna-Maria ; Eisenberg, Michael L ; Jensen, Tina Kold ; Jørgensen, Niels ; Swan, Shanna H ; Sapra, Katherine J ; Ziebe, Søren ; Priskorn, Lærke ; Juul, Anders
Subjects: Cultural differences ; Environmental Exposure ; Epigenetics ; Fertility ; Fertility - genetics ; Gene-Environment Interaction ; Genetic Predisposition to Disease ; Humans ; Incidence ; Infertility, Male - diagnosis ; Infertility, Male - epidemiology ; Infertility, Male - genetics ; Infertility, Male - physiopathology ; Life Style ; Male ; Phenotype ; Physiology ; Population Dynamics ; Reproductive system ; Reviews ; Risk Factors
Is Part Of: Physiological reviews, 2016-01, Vol.96 (1), p.55-97
Description: It is predicted that Japan and European Union will soon experience appreciable decreases in their populations due to persistently low total fertility rates (TFR) below replacement level (2.1 child per woman). In the United States, where TFR has also declined, there are ethnic differences. Caucasians have rates below replacement, while TFRs among African-Americans and Hispanics are higher. We review possible links between TFR and trends in a range of male reproductive problems, including testicular cancer, disorders of sex development, cryptorchidism, hypospadias, low testosterone levels, poor semen quality, childlessness, changed sex ratio, and increasing demand for assisted reproductive techniques. We present evidence that several adult male reproductive problems arise in utero and are signs of testicular dysgenesis syndrome (TDS). Although TDS might result from genetic mutations, recent evidence suggests that it most often is related to environmental exposures of the fetal testis. However, environmental factors can also affect the adult endocrine system. Based on our review of genetic and environmental factors, we conclude that environmental exposures arising from modern lifestyle, rather than genetics, are the most important factors in the observed trends. These environmental factors might act either directly or via epigenetic mechanisms. In the latter case, the effects of exposures might have an impact for several generations post-exposure. In conclusion, there is an urgent need to prioritize research in reproductive physiology and pathophysiology, particularly in highly industrialized countries facing decreasing populations. We highlight a number of topics that need attention by researchers in human physiology, pathophysiology, environmental health sciences, and demography.
Publisher: United States: American Physiological Society
Language: English
Identifier: ISSN: 0031-9333
EISSN: 1522-1210
DOI: 10.1152/physrev.00017.2015
PMID: 26582516
CODEN: PHREA7
Source: GFMER Free Medical Journals
MEDLINE
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Male Reproductive Disorders and Fertility Trends: Influences of Environment and Genetic Susceptibility

Copyright © 2016 the American Physiological Society. ;Copyright © 2016 the American Physiological Society 2016 American Physiological Society ;ISSN: 0031-9333 ;EISSN: 1522-1210 ;DOI: 10.1152/physrev.00017.2015 ;PMID: 26582516 ;CODEN: PHREA7

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