hrp0092ha1 | Development of Testicular Organoids to Understand Disorders of Sex Development | ESPE2019

Development of Testicular Organoids to Understand Disorders of Sex Development

Eozenou Caroline , McElreavey Ken , Bashamboo Anu

Disorders of sex development (DSD) constitute an array of rare disorders affecting the genito-urinary tract and the endocrine-reproductive system and are often identified in the newborn or adolescent. Gene mutations causing DSD are slowly being identified using high-throughput sequencing, but the interpretation of the data and ascribing causality to novel variants is challenging. This is because DSD mutations occur in multiple genes with each gene affecting a small number of i...

hrp0082p2-d3-554 | Puberty and Neuroendocrinology (2) | ESPE2014

Predominantly Matrilineal Inheritance of Familial Precocious Puberty Suggests an Underlying Imprint Anomaly

Durand Adelaide , Brauner Raja , Bashamboo Anu , McElreavey Ken

Background: The age of onset of puberty is known to be influenced by poorly understood genetic and environmental factors. Familial forms of precocious puberty suggest the involvement of autosomal genetic factors.Objective and hypotheses: We evaluated the mode of inheritance of precocious puberty in a large series of familial cases of both central precocious puberty (CPP) and advanced puberty.Method: A retrospective, single-centre s...

hrp0084p2-304 | DSD | ESPE2015

A Novel Homozygous Missense Mutation in RSPO1 Associated with a Familial Case of 46,XX Testicular and Ovotesticular DSD

Naasse Yassine , Jennane Farida , Hicham Sibai , McElreavey Ken , Bashamboo Anu

Background: RSPO1 is an activator of the canonical Wnt signalling pathway by acting as a ligand for LGR4–6 receptors and an a 46,XX individual it represses testicular development. Only three families have been reported in the literature with recessive mutations in RSPO1 and syndromic 46,XX sex-reversal.Objective and hypotheses: We identified a consanguineous family from Southern Morocco with two sibs presenting with 46,XX testicular and ovo...

hrp0092fc10.4 | Sex Differentiation, Gonads and Gynaecology or Sex Endocrinology | ESPE2019

Loss-Of-Function and Missense Mutations in MYRF are a Novel Cause of Autosomal Dominant 46,XY Leydig Cell Hypoplasia and 46,XY Gonadal Dysgenesis

McElreavey Ken , Globa Evgenia , Bertalan Rita , Bignon-Topalovic Joelle , Brauner Raja , Bashamboo Anu

MYRF is known to regulate the myelination of the central nervous system and mice with a conditional deletion of MYRF in oligodendrocyte precursors has anomalies of motor skill. Recently, several loss-of-function and missense mutations in MYRF have been reported in association with syndromic forms of congenital heart disease (CHD) with elements of Scimitar syndrome and/or with congenital diaphragmatic hernia (CDH). In most 46,XY individuals a range of...

hrp0092p1-127 | Sex Differentiation, Gonads and Gynaecology or Sex Endocrinology | ESPE2019

Mutations in CBX2 Associated with Gonadal Anomalies in 46,XY and 46,XX Individuals

Merel Tiphanie , Eozenou Caroline , Van Maldergem Lionel , Globa Evgenia , McElreavey Ken , Bashamboo Anu

The Polycomb Repressive Complex 1 (PRC1) represses gene expression through CBX2, which binds to H3K27me3 and promotes chromatin expression. Recently, CBX2 has been shown to function in testis-formation by directly repressing Wnt4's downstream target, Lef1, in Sertoli cells rather than positively controlling Sry expression, as previously thought. Here, we describe two new cases carrying missense mutations in CBX2. The first is a female with 46,XY ...

hrp0089p1-p215 | Sex Differentiation, Gonads and Gynaecology or Sex Endocrinology P1 | ESPE2018

Mutations Involving Nuclear Receptors and Their Cofactors as a Major Cause of 46,XX DSD

Bashamboo Anu , Eozenou Caroline , Houzelstein Denis , Bignon-Topalovic Joelle , Achermann John , McElreavey Ken

The genomic analysis of 46,XX individuals with testes (known as testicular Disorders/Differences of Sex Development (TDSD) or ovotestes (ovotesticular DSD (OTDSD)) supports the hypothesis that ‘pro-testis/anti-ovary’ or ‘pro-ovary/anti-testis’ genetic pathways exist. These children typically present with virilized genitalia due to testosterone production from the presence of testicular tissue. Many individuals with TDSD and a minority with OTDSD have a tran...

hrp0086rfc7.4 | Gonads & DSD | ESPE2016

A Mutation in WT1 (Wilms’ Tumor Suppressor 1) Associated with 46,XX TDSD

Eozenou Caroline , Fusee Leila , Mazen Ines , Bignon-Topalovic Joelle , McElreavey Ken , Bashamboo Anu

Background: 46,XX DSD (Disorder of Sex Development) includes individuals with ovotestes (ovotesticular DSD (OTDSD)) or testes (testicular DSD (TDSD)). Most individuals with 46,XX TDSD carry the SRY gene. Other known causes of TDSD/OTDSD include chromosomal rearrangements involving SOX9 or SOX3 and mutations of WNT4 and a WNT regulator, R-SPONDIN 1. However, our understanding of the molecular causes of TDSD and OTDSD remain incomplete.<p ...

hrp0082p1-d3-92 | Sex Development | ESPE2014

Mutations Involving FIBULIN2 are a Novel Cause of 46,XY DSD

Bashamboo Anu , Palka Chiara , Mohn Angelika , Chiavaroli Valentina , Chiarelli Francesco , Brauner Raja , McElreavey Ken

Background: The genetic causes of disorders of sex development (DSD) are difficult to identify since these conditions are refractory to classic genetic approaches. In particular the underlying genetic mutations of most cases of 46,XY DSD is unknown.Objective and hypotheses: Using an exome sequencing approach we aimed to identify new genetic factors involved in 46,XY gonadal dysgenesis.Method: Exon enrichment was performed using Agi...

hrp0092p2-244 | Sex Differentiation, Gonads and Gynaecology or Sex Endocrinology | ESPE2019

The Evolving Role of Whole Exome Sequencing in the Diagnosis of Disorders of Sex Development (DSD)

Tenenbaum-Rakover Yardena , Admoni Osnat , Elias-Assad Ghadir , London Shira , Noufi- Barhoum Marie , Ludar Hana , Almagor Tal , Bertalan Rita , Bashamboo Anu , McElreavey Ken

Background: Disorders of sex development (DSD) are classified as a congenital discrepancy between external genitalia, and gonadal and chromosomal sex. Despite extensive laboratory and imaging investigations, the etiology of DSD is unknown in more than 50% of patients. We aimed to evaluate the etiology of DSD using whole exome sequencing (WES) technique.Methods: Eleven patients with DSD (ten with 46,XY and one with 46...

hrp0084fc6.2 | Gonads &amp; DSD | ESPE2015

A Role for DMRT1 in Human Primary Sex-Determination

Rojo Sandra , Murphy Mark , Lee John , Gearhart Micah , Kurahashi Kayo , Banerjee Surajit , Loeuille Guy-Andre , Zarkower David , Aihara Hideki , Bardwell Vivian , McElreavey Ken , Bashamboo Anu

Background: DMRT transcription factors are highly conserved regulators of metazoan sexual development. The role of DMRT1 in human primary sex-determination is unclear. Chromosome 9p deletions that remove one copy of DMRT1 are associated with 46,XY feminization and gonadal dysgenesis. While they suggest that DMRT1 is haploinsufficient for testicular development, these deletions usually remove other genes, including DMRT2 and DMRT3. Also, most 9p deletions cause incomplete gonad...