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  • Title: Homeobox gene ESX1L expression is decreased in human pre-term idiopathic fetal growth restriction.
    Author: Murthi P, Doherty VL, Said JM, Donath S, Brennecke SP, Kalionis B.
    Journal: Mol Hum Reprod; 2006 May; 12(5):335-40. PubMed ID: 16613891.
    Abstract:
    Fetal growth restriction (FGR) is a clinically significant pregnancy disorder in which the fetus fails to achieve its full growth potential in utero. This study involved idiopathic FGR, which is frequently associated with placental dysfunction. Here, we investigated mRNA levels of the human placental homeobox gene ESX1L in pre-term and term idiopathic FGR pregnancies compared with gestation-matched controls. Real-time PCR quantitation showed ESX1L levels in control placentae decreased between pre-term and term [0.7 +/- 0.20 (27-35 weeks, n = 13) versus 0.2 +/- 0.06 (36-41 weeks, n = 12), t-test, P < 0.005]. ESX1L levels in FGR-affected placentae were significantly lower than in gestation-matched controls, and there was no significant change between pre-term FGR and term FGR [0.32 +/- 0.04 (27-36 weeks, n = 11) versus 0.31 +/- 0.02 (36-41 weeks, n = 14), t-test, P = 0.82]. Multiple linear regression analysis revealed a rapid decline in ESX1L expression in control placentae [0.075-fold of the calibrator for each week of gestation (95% CI = -0.105 to -0.045, P < 0.0005)]. In FGR-affected placentae, ESX1L levels were lower than in gestation-matched controls, and the decline in ESX1L levels with gestation was not significant [0.001-fold of the calibrator for each week of gestation (95% CI = -0.030 to 0.010, P < 0.3]. The linear relationship between ESX1L mRNA levels in FGR-affected placentae and gestation-matched controls during gestation was significantly different (likelihood ratio test for interaction, P = 0.0005). Our findings were consistent with a potential role for the ESX1L gene within the growth control mechanism of the fetus, through its effect on placental function.
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