Multifunctional role of steroidogenic factor 1 and disorders of sex development

Papel multifuncional do fator esteroidogênico 1 e as doenças do desenvolvimento sexual

REVIEW

Multifunctional role of steroidogenic factor 1 and disorders of sex development

Papel multifuncional do fator esteroidogênico 1 e as doenças do desenvolvimento sexual

Maricilda Palandi de Mello^I; Emerson Salvador de Souza França^I; Helena Campos Fabbri^I; Andréa Trevas Maciel-Guerra^II; Gil Guerra-Júnior^III

^ICentro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (Unicamp), Campinas, SP, Brazil

^IIDepartamento de Genética Médica, Faculdade de Ciências Médicas (FCM), Unicamp, Campinas, SP, Brazil

^IIIDepartamento de Pediatria, FCM-Unicamp, Campinas, SP, Brazil

^{Correspondência}

SUMMARY

Disorders of sex development (DSD) involve several conditions that result from abnormalities during gonadal determination and differentiation. Some of these disorders may manifest at birth by ambiguous genitalia; others are diagnosed only at puberty, by the delayed onset of secondary sexual characteristics. Sex determination and differentiation in humans are processes that involve the interaction of several genes such as WT1, NR5A1, NR0B1, SOX9, among others, in the testicular pathway, and WNT4, DAX1, FOXL2 and RSPO1, in the ovarian pathway. One of the major proteins in mammalian gonadal differentiation is the steroidogenic nuclear receptor factor 1 (SF1). This review will cover some of the most recent data on SF1 functional roles and findings related to mutations in its coding gene, NR5A1.

Keywords: Steroidogenic factor 1; NR5A1 gene; disorders of sex development

SUMÁRIO

Os distúrbios do desenvolvimento sexual (DDS) envolvem várias condições que resultam de anormalidades que podem acontecer tanto na determinação como durante a diferenciação gonadal. Algumas dessas doenças podem se manifestar ao nascimento principalmente por genitália ambígua, outras são diagnosticadas apenas na puberdade por atraso no aparecimento de características sexuais secundárias. A determinação e a diferenciação do sexo em seres humanos são processos que envolvem interações entre vários genes nas vias testicular, tais como NR5A1, NR0B1, WT1, SOX9, entre outros, e ovariana, tais como WNT4, DAX1, FOXL2 e RSPO1. Uma das principais proteínas na diferenciação gonadal de mamíferos é o fator esteroidogênico e receptor nuclear 1 (SF1). Esta revisão cobrirá alguns dos dados mais recentes sobre os papéis funcionais de SF1 e as últimas descobertas relacionadas a mutações em seu gene, NR5A1.

Descritores: Fator esteroidogênico 1; gene NR5A1; doenças do desenvolvimento sexual

The presence or absence of the Y chromosome in the karyotype of most mammals, including humans, is linked, respectively, to the processes of male and female sex determination and differentiation (1,2). Sex development is classically divided into three stages: determination, which is chromosomally established at fertilization; differentiation of the gonads from undifferentiated embryonic structures into testes or ovaries; and secondary sexual differentiation, which is the res-ponse of innumerous tissues to hormones produced by either gonads to complete sexual maturation during puberty (3). Disorders of sex development (DSD) involve several conditions that result from abnormalities in one of the three stages. Some of these disorders may manifest at birth by ambiguous genitalia; others are diagnosed only at puberty by delayed onset of secondary sexual characteristics (4,5). In cases of newborns with ambiguous genitalia, the definition of appropriate sex is urgent, because it generally requires a series of surgical procedures, hormone therapy and counseling (5). The understanding of the intricate processes that involve sex determination and differentiation has been a challenge for physicians and scientists in general.

DSD are characterized by incomplete or disordered gonadal or genital development, leading to divergences between genetic sex, gonadal sex and phenotypic sex, specially in individuals with 46,XY karyotype (6,7). These cases present female or ambiguous genitalia that may vary from mild to severe hypospadias, with or without penoscrotal chordee, dysgenetic testes, reduced or null sperm production, and Müllerian structures that may be absent or present as fully developed uterus and fallopian tubes (8). In cases of 46,XY DSD, gonadal dysgenesis refers to a set of abnormalities characterized by dysgenetic gonads as a result of failures in the expression or function of genes involved in testicular development (4,9). Dysgenetic gonads are mainly formed by fibrous tissue without hormonal function that is not able to produce gametes; whereas dysgenetic testes are associated with abnormalities in the differentiation of the Wolffian ducts, in external genitalia virilization, and in the regression of Müllerian ducts (10).

Gonadal dysgenesis may be classified as pure (complete), partial (incomplete) or mixed dysgenesis (11). Complete gonadal dysgenesis (CGD) is characterized by phenotypically female individuals without genital ambiguity, and presence of dysgenetic gonads, and normal Müllerian derivatives. It may occur in individuals with normal karyotypes, 46,XX or 46,XY (12). Individuals with XY CGD are prone to developing gonadal tumors (13). Conversely, incomplete gonadal dysgenesis (DGI) is characterized by individuals 46,XY without mosaicism, with partial testicular differentiation, derivatives of Müllerian ducts and genital ambiguity. Usually, seminiferous tubules are present and associated with areas similar to ovarian stroma. Internal genitalia consists of derivatives of both Wolffian and Müllerian ducts (12). The presence of a second cell lineage presenting 45,X in the karyotype characterizes mixed gonadal dysgenesis (14).

After two decades of the identification of SRY gene as the sex-determining region on the Y chromosome responsible for initiating male development, it is well known that sex determination and differentiation in humans are processes that involve the interaction of several genes, such as WT1, NR5A1, NR0B1, SOX9, among others, in the testicular pathway; and WNT4, DAX1, FOXL2 and RSPO1, in the ovarian pathway (8,15). Figure 1 illustrates the main steps and genes involved in gonadal differentiation that result in male and female characteristics.

One of the major proteins in mammalian gonadal differentiation is the steroidogenic nuclear receptor factor 1 (SF1) now known as nuclear receptor subfamily 5 group A member 1 (NR5A1 [MIM 184757]). The human SF1 protein is formed by 461 amino acids and is a member of the orphan nuclear receptor family, considered the main regulator of enzymes involved in adrenal and gonadal steroidogenesis, and is expressed in undifferentiated gonads before SRY (16). The expression of NR5A1 gene, which encodes SF1 protein, is necessary at three stages throughout testis determination and differentiation: in the formation of bipotential gonads; in the Sertoli cells, to regulate the expression of anti-Müllerian hormone gene (AMH); and in the Leydig cells, to regulate the expression a number of steroid hormones (17,18). Therefore, it plays an important role in the expression of male specific genes. In female development, it is also actively present and participates in different steps of ovarian development and function (19). The wide range of action of this protein became evident after observations in mice, showing that the gene is expressed very early in the urogenital ridge, and acts later on in the development of the adrenals, gonads, pituitary, and ventromedial hypothalamus (20,21).

SF1 was first isolated in 1992 during the search for elements that regulate the proximal promoter region of the cytochrome P450 21-hydroxylase enzyme (22). SF1 protein is highly expressed in steroidogenic tissues, such as gonads, adrenals, and placenta, and regulates almost all the enzymes related to this process (23). It is essential not only in adrenal and gonadal development and sex differentiation, but also plays important physiological roles in the central nervous system (21). As illustrated in figure 1, after testicular determination, SF1 regulates the expression of anti-Mülllerian hormone in Sertoli cells, which leads to regression of Müllerian structures during fetal development (18). In Leydig cells, SF1 activates the expression of steroidogenic enzymatic system, resulting in virilization of external genitalia and testicular descent (24,25). In females, SF1 is expressed in ovarian theca cells and granulosa cells, early in folliculogenesis (26). In addition, SF1 is the main regulator of cholesterol metabolism in steroidogenic cells, stimulating the expression of almost all factors involved in the mobilization of cholesterol and steroid hormone biosynthesis (27).

NR5A1 is an autosomal gene located at 9q33 (OMIM 184757). It expands over 30 kb of genomic DNA divided into one non-coding exon followed by six coding exons (28). The structure of human SF1 protein includes: a DNA-binding domain (DBD) containing two zinc fingers, a ligand-binding domain (LBD), two functional activation domains (AF-1 and AF-2); an accessory region, and a hinge region. The first zinc finger contains a proximal (P box) region, that is involved in nuclear receptor specific recognition of DNA target sequences (29). The region contains an accessory box that stabilizes DNA binding. The hinge region is important for SF1 transcriptional activity (30). Moreover, unlike most nuclear receptors, SF1 binds DNA as a monomer with high affinity for the region 5'YCAAGGYCR'3 (where Y = T / C, R = G / A) (31). As a member of the NR5A subfamily, it has the DBD extended by a FTZ-F1 box, which is important for DNA anchoring. This box contains a T-box that supports an A-box that, in turn, interacts co-operatively with the P-box in the first Zn-finger of the DBD, and defines the specificity of the monomeric DNA binding (20).

Similar to the great majority of transcription factors, the activation of SF1 transcriptional activity requires the interaction with other proteins through its protein activation domains (20). Furthermore, transcriptional activity of SF-1 is modified by post-translational modifications such as phosphorylation/dephosphorylation, acetylation and SUMOylation (20,21). Its expression is precisely regulated in a time- and tissue-dependent manner by promoters formed through alternative noncoding exons 1 (32,33), upstream stimulatory factors 1 and 2 (USF1, USF2) (34), interactions at the basal promoter region with different regulatory elements (20), and methylation at the basal promoter region, as well as at intronic enhancers (35).

Several studies have shown that the NR5A1 gene is highly conserved among species, and the overall amino acid similarity between mice and humans is 95%. Homozygous mutations that inactivate SF1 in mice are manifested by the absence of adrenal and gonadal development, the absence of pituitary gonadotropins and structural changes in the ventral and median hipotalamus regions. Nr5A1 gene deletions in such animals cause complete adrenal and gonadal agenesis, defects in virilization and retention of Müllerian ducts in XY animals (36,37). Abnormalities in the pituitary and in the brain, specifically in the ventromedial hypothalamus, are also attributed to the Nr5A1 deletion (21).

Sequencing NR5A1 gene of an XY female revealed the heterozygosity for the missense mutation p.Gly35Glu (38). This was the first mutation described in humans, and the reported patient presented primary adrenal insufficiency, complete gonadal dysgenesis, and Müllerian duct persistence. It was a de novo heterozygous mutation, leading to an amino acid substitution in the first zinc finger P-box DNA-binding region, severely affecting SF1 function (38,39). A homozygous patient with similar phenotype had been subsequently described as carrying the p.Arg92Gln mutation located in the A-box region. This inherited mutation caused partial loss of SF1 function in vitro, what explained that heterozygous carriers were normal (40). Several studies showed an haploinsufficiency effect caused by inactivating mutations in the NR5A1 gene in 46,XY heterozygous individuals with gonadal dysgenesis and without adrenal failure (41-43). Actually, mutations in the NR5A1 gene may be more frequent in patients with gonadal dysgenesis without adrenal insufficiency than in patients with both gonadal dysgenesis and adrenal insufficiency (43). Considering the type of each mutation already identified in NR5A1, it is difficult to establish a direct phenotype-genotype correlation (Figure 2). If we consider that there is a dosage effect, it is difficult to understand why all patients heterozygous for severe nonsense mutations occurring in the first and second coding exons, as well as other frameshift mutations that are considered to undergo mRNA nonsense-mediated decay, do not present the severe phenotype, including adrenal insufficiency. Nevertheless, heterozygous mutations such as p.Glu11Ter, p.Cis16Ter and p.Glu51ArgfsX23 were identified in patients with, respectively, XY DSD and severe penoscrotal hypospadia, and cryptorchidism without adrenal insufficiency. Most mutations were found in heterozygous patients either as de novo mutations or as inherited from a non-affected parent, indicating a dominant inheritance with different degree of penetrance. It is interesting to note that from the nine mutations identified in XY DSD and in XX primary ovarian insufficiency, eight are nonsense or frameshift mutations (Figure 2), and most of them had been inherited. Conversely, there are two cases of homozygosity for inherited mutations enabling the conclusion that, in those cases, the mutation was transmitted in a recessive manner. The p.Arg92Gln described above is one, and the other is p.Asp293Asn, which was found segregating in a family, and resulted in three different phenotypes: XX primary ovarian insufficiency, XY incomplete gonadal dysgenesis, and XY complete gonadal dysgenesis (44,45).

Many studies have shown that variations in the NR5A1 may be associated not only with gonadal dysgenesis and adrenal failure, but also with hypospadias, anorchia, male infertility, and premature ovarian failure, affecting both 46,XY and 46,XX individuals. In some cases, it may be also associated with adrenal tumors and endometriosis (46).

The identification of NR5A1 nucleotide changes in women with primary ovarian failure clearly indicates that SF1 is indeed a key factor in the development and function of ovaries in humans (44), although it was considered before that NR5A1 mutations might not interfere with ovarian development (47). SF1 failure may affect the ovary at several levels: reducing the number of germ cells, damaging stroma integrity, and causing abnormal folliculogenesis. Phenotypic variability is verified for either 46,XY or 46,XX individuals carrying NR5A1 mutations within families, probably as a result of multifunctional roles of SF1 protein (8,15,44,45,48). Another example of a mutated SF1 allele affecting both male and female development is the allele carrying the mutations p.Gly123Ala and p.Pro129Leu within the SF1 hinge region, which has been associated to either ovarian insufficiency or male infertility (44,49). In addition, p.Gly146Ala, also located in the hinge region, has been described as a missense associated with micropenis and cryptorchidism (50).

Finally, all the molecular studies reported so far indicate different clinical manifestations for different nucleotide changes in the NR5A1 gene. Bilateral anorchia or testicular regression, in addition to all other manifestations, was reported as a result of p.Val355Met mutation in one out of 24 children evaluated (51). However, a recent study involving 26 patients with the same condition did not reveal any mutation (52), indicating that NR5A1 mutation might be not a frequent cause of anorchia. It can be inferred from all data reported so far that mutations in the NR5A1 gene are more frequent than in the SRY gene in cases of 46,XY DSD (53). However, more research on mutation screenings is necessary to indicate NR5A1 gene mutations as frequent causes of either primary or premature ovarian failure without adrenal insufficiency.

The findings reviewed here indicate a complex expressivity of the phenotype, penetrance, and modes of inheritance of NR5A1 mutations, and suggest that more research has to be done to figure out how NR5A1 mutations correlate with different phenotypes, whether and how other genes modulate their expressivity, and to identify these genes for each affected phenotype.

Acknowledgements: the authors would like to thank Fundação de Amparo à Pesquisa do Estado de São Paulo and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq - Brasil) for their financial support.

Disclosure: no potential conflict of interest relevant to this article was reported.

Received on 6/Oct/2011

Accepted on 19/Oct/2011

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Publication Dates

• Publication in this collection
  03 Jan 2012
• Date of issue
  Nov 2011

History

• Received
  06 Oct 2011
• Accepted
  19 Oct 2011