Publications by authors named "Olaf Hiort"

Objective: Individuals with a difference of sex development (DSD) face complex medical and psychosocial challenges, which can make it difficult to provide care tailored to their needs and in line with guidelines. The DSDCare project in Germany regularly evaluates the quality of care for people with DSD, focusing on patient satisfaction as a key indicator of care quality.

Design: Nationwide, longitudinal, multicentre observational study in Germany, including people with DSD.

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Objective: 17β-Hydroxysteroid dehydrogenase 3 deficiency (17β-HSDD) and 5α-reductase type 2 deficiency (5α-RD) are rare 46,XY differences of sex development (DSD). This study aims to enlarge the limited knowledge on long-term gonadal function and gonadal pathology in these conditions.

Design: Retrospective multicentre cohort study.

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Background: People with "Differences of Sex Development" (DSD) require comprehensive, specialised, and individualised medical and psychological care. This is often perceived as inadequate by those affected. Therefore, the German Federal Ministry of Health funded the project DSDCare which aimed to improve the quality of care for people with DSD over the lifespan in Germany.

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Introduction: Partial androgen insensitivity syndrome (PAIS) is a rare condition that is reported to be commonly associated with gynecomastia in males.

Objectives: To assess the management of gynecomastia in male PAIS.

Materials And Methods: Retrospective review of males with PAIS over the age of 10 years in the I-DSD registry.

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Article Synopsis
  • The study evaluated a new interdisciplinary education program aimed at children, adolescents, and young adults with differences of sex development (DSD) and their parents, focusing on participant satisfaction.
  • The program included tailored medical information, peer support, and psychological assistance over two days, with satisfaction measured using an adapted ZUF-8 questionnaire, revealing consistently high scores across all age groups and parental participants.
  • The findings suggest that the program was well-received regardless of age or diagnosis, and highlight the need for further analysis on its long-term impact on participants’ well-being and knowledge.
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Introduction: Achieving evidence-based, high-quality medical care is the overarching goal of healthcare quality management. Quality indicators (QIs) serve as proxies to show whether good quality is reached or not. This article describes the development of QI for the evaluation of healthcare quality in the area of differences of sex development (DSD).

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In this perspective article we discuss the limitations of sex as a binary concept and how it is challenged by medical developments and a better understanding of gender diversity. Recent data indicate that sex is not a simple binary classification based solely on genitalia at birth or reproductive capacity but encompasses various biological characteristics such as chromosomes, hormones, and secondary sexual characteristics. The existence of individuals with differences in sex development (DSD) who do not fit typical male or female categories further demonstrates the complexity of sex.

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The 2006 Chicago consensus statement of management of disorders/difference of sex development (DSD) has achieved advantages in clinical care and diagnosis for patients and families affect by DSD. This article provides a brief overview of contexts of care for physicians, and points out specific challenges in clinical practice that have arisen from the transformations of the sex/gender system in recent years. We focus on the impact of diagnosis and laboratory measurements.

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Context: Reliable estradiol (E2) reference intervals (RIs) are crucial in pediatric endocrinology.

Objectives: This study aims to develop a sensitive ultra-performance liquid chromatographic tandem mass spectrometry (UPLC-MS/MS) method for E2 in serum, to establish graphically represented RI percentiles and annual RIs for both sexes, and to perform a systematic literature comparison.

Methods: First, a UPLC-MS/MS method for E2 was developed.

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The current study aims to assess the development of the knowledge generation program of the European Reference Network on Rare Endocrine Conditions (Endo-ERN) from its start in 2019 until December 2021, with special reference to webinars. We analyzed the number of webinars and live/postevent participants and whether participation and engagement of the attendees changed over time. A total of 30 (86%) self-prepared webinars comprising 300 h of knowledge and competence sharing were broadcasted (2019 - 3; 2020 - 13; 2021 - 14).

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The group of disorders known as 46,XY gonadal dysgenesis (GD) is characterized by anomalies in testis determination, including complete and partial GD (PGD) and testicular regression syndrome (TRS). Several genes are known to be involved in sex development pathways, however approximately 50% of all cases remain elusive. Recent studies have identified variants in , a gene encoding a putative RNA helicase essential in ribosome biogenesis and previously associated with neurodevelopmental disorders, as a cause of PGD and TRS.

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Purpose: The transition process from paediatric/adolescent to adult medical care settings is of utmost importance for the future health of adolescents with chronic diseases and poses even more difficulties in the context of rare diseases (RDs). Paediatric care teams are challenged to deliver adolescent-appropriate information and structures. Here we present a structured transition pathway which is patient-focused and adoptable for different RDs.

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Context: Burosumab has been approved for the treatment of children and adults with X-linked hypophosphatemia (XLH). Real-world data and evidence for its efficacy in adolescents are lacking.

Objective: To assess the effects of 12 months of burosumab treatment on mineral metabolism in children (aged <12 years) and adolescents (aged 12-18 years) with XLH.

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Introduction: Although it was common in the 1970s-1990s to assign female gender of rearing to 46,XY infants with limited virilization of varying etiologies, including those with partial androgen insensitivity syndrome (PAIS), long-term data on outcomes for these individuals are sparse. Therefore, our goal was to use the power of an international registry to evaluate clinical features, surgical management, and pubertal data in patients with a molecularly confirmed diagnosis of PAIS who were born before 2008 and were raised as girls.

Methods: The current study interrogated the International Disorders of Sex Development Registry for available data on management and pubertal outcomes in individuals with genetically confirmed PAIS who were raised as girls.

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Objective: Congenital defects of androgen synthesis or action in 46,XY individuals can result in impaired virilisation, despite the apparent testicular development. In a recent case, report of a young adult with complete androgen insensitivity syndrome (CAIS), tumourous gonadal tissue was shown to express HSD17B3 in Sertoli cells (SCs) and not in Leydig cells (LCs). This expression pattern differs from the typical adult human testis and resembles a foetal mouse testis, suggesting an underlying testicular development and function defect.

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A region of 160 kb at Xp21.2 has been defined as dosage-sensitive sex reversal (DSS) and includes the gene, considered to be the candidate gene involved in XY gonadal dysgenesis if overexpressed. We describe a girl with 46,XY partial gonadal dysgenesis carrying a 297 kb duplication at Xp21.

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Aims: To explore the impact of primarily telemedical care for children and adolescents with type 1 diabetes by monthly video consultations on metabolic control and parents' treatment satisfaction and disease-specific burden during the COVID-19 pandemic.

Methods: In this 12-month multicenter observational follow-up VIDIKI 2.0 study, 100 participants (3-18 years) received monthly video consultations, which partially replaced quarterly outpatient clinic appointments during the pandemic.

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Objective: The European Reference Network on Rare Endocrine Conditions (Endo-ERN) aims to organize high-quality healthcare throughout Europe, including care for pituitary adenoma patients. As surgery is the mainstay of treatment, we aimed to describe the current surgical practice and published surgical outcomes of pituitary adenoma within Endo-ERN.

Design And Methods: Systematic review and meta-analysis of studies reporting surgical outcomes of pituitary adenoma patients within Endo-ERN MTG6 pituitary reference centers between 2010 and 2019.

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Article Synopsis
  • Differences of sex development and maturation (SDM) are complex conditions with a strong genetic basis, and improving their management requires better classification of these genetic factors through next-generation sequencing (NGS).
  • A survey conducted with 53 healthcare providers from a European network found that 49% responded, with most using NGS on 6720 patients—over half of whom had differences of sex development, including specific cases of ovarian insufficiency and hypogonadotropic hypogonadism.
  • The results from genetic analyses varied significantly, with detection rates of genetic variants ranging from 7% to 60%, highlighting the need for standardized practices and improved NGS methodologies across Europe for effective diagnosis and treatment.
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Background: Duplications at the Xp21.2 locus have previously been linked to 46,XY gonadal dysgenesis (GD), which is thought to result from gene dosage effects of (), but the exact disease mechanism remains unknown.

Methods: Patients with 46,XY GD were analysed by whole genome sequencing.

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De novo variants in the myelin regulatory factor (MYRF), a transcription factor involved in the differentiation of oligodendrocytes, have been linked recently to the cardiac and urogenital syndrome, while familiar variants are associated with nanophthalmos. Here, we report for the first time on a patient with a de novo stop-gain variant in (p.Q838*) associated with Scimitar syndrome, 46,XY partial gonadal dysgenesis (GD) and severe hyperopia.

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Introduction: NR5A1 is an essential transcription factor that regulates several target genes involved in reproduction and endocrine function. Pathogenic variants in this gene are responsible for a wide spectrum of disorders/differences of sex development (DSD).

Methods: The molecular study involved Sanger sequencing, in vitro assays, and whole exome sequencing (WES).

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Article Synopsis
  • The Empower-DSD project aims to create a multidisciplinary education program to enhance knowledge and skills for patients with differences in sexual development (DSD) and their parents.
  • The program is tailored for children, adolescents, and young adults with specific DSD conditions, using both quantitative and qualitative evaluation methods to assess outcomes related to health-related quality of life and disease knowledge.
  • The study focuses on addressing knowledge gaps and ensuring the feasibility and acceptance of standardized education for young people with DSD, with structured curricula designed for various diagnoses and age groups implemented across multiple study centers.
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