Research Article: Loss of Function of the Nuclear Receptor NR2F2, Encoding COUP-TF2, Causes Testis Development and Cardiac Defects in 46,XX Children

Date Published: March 01, 2018

Publisher: Elsevier

Author(s): Anu Bashamboo, Caroline Eozenou, Anne Jorgensen, Joelle Bignon-Topalovic, Jean-Pierre Siffroi, Capucine Hyon, Attila Tar, Péter Nagy, Janos Sólyom, Zita Halász, Annnabel Paye-Jaouen, Sophie Lambert, David Rodriguez-Buritica, Rita Bertalan, Laetitia Martinerie, Ewa Rajpert-De Meyts, John C. Achermann, Ken McElreavey.

http://doi.org/10.1016/j.ajhg.2018.01.021

Abstract

Emerging evidence from murine studies suggests that mammalian sex determination is the outcome of an imbalance between mutually antagonistic male and female regulatory networks that canalize development down one pathway while actively repressing the other. However, in contrast to testis formation, the gene regulatory pathways governing mammalian ovary development have remained elusive. We performed exome or Sanger sequencing on 79 46,XX SRY-negative individuals with either unexplained virilization or with testicular/ovotesticular disorders/differences of sex development (TDSD/OTDSD). We identified heterozygous frameshift mutations in NR2F2, encoding COUP-TF2, in three children. One carried a c.103_109delGGCGCCC (p.Gly35Argfs∗75) mutation, while two others carried a c.97_103delCCGCCCG (p.Pro33Alafs∗77) mutation. In two of three children the mutation was de novo. All three children presented with congenital heart disease (CHD), one child with congenital diaphragmatic hernia (CDH), and two children with blepharophimosis-ptosis-epicanthus inversus syndrome (BPES). The three children had androgen production, virilization of external genitalia, and biochemical or histological evidence of testicular tissue. We demonstrate a highly significant association between the NR2F2 loss-of-function mutations and this syndromic form of DSD (p = 2.44 × 10−8). We show that COUP-TF2 is highly abundant in a FOXL2-negative stromal cell population of the fetal human ovary. In contrast to the mouse, these data establish COUP-TF2 as a human “pro-ovary” and “anti-testis” sex-determining factor in female gonads. Furthermore, the data presented here provide additional evidence of the emerging importance of nuclear receptors in establishing human ovarian identity and indicate that nuclear receptors may have divergent functions in mouse and human biology.

Partial Text

The sex chromosomes of an individual usually direct gonadal sex development toward either a testis or ovary pathway. In 46,XY individuals, the presence of the Y chromosome testis-determining gene SRY (MIM: 601947) triggers a genetic cascade that both initiates testis formation and represses the formation of the ovary.1 Although many factors are known to be involved in early testis development, far less is known about genetic factors controlling the ovary.1 However, emerging evidence suggests that ovary development involves more than just a default (passive) pathway,2 consistent with the Z-factor theory proposed 25 years ago that the XX gonad expresses an elusive factor that actively promotes both “anti-testis” and “pro-ovary” functions.3

 

Source:

http://doi.org/10.1016/j.ajhg.2018.01.021

 

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