The fetus in the age of the genome

Practical Approach to Congenital Anomalies of the Kidneys: Focus on Anomalies With Insufficient or Abnormal Nephron Development: Renal Dysplasia, Renal Hypoplasia, and Renal Tubular Dysgenesis

Congenital anomalies of the kidney and urinary tract (CAKUT) accounts for up to 30% of antenatal congenital anomalies and is the main cause of kidney failure in children worldwide. This review focuses on practical approaches to CAKUT, particularly those with insufficient or abnormal nephron development, such as renal dysplasia, renal hypoplasia, and renal tubular dysgenesis. The review provides insights into the histological features, pathogenesis, mechanisms, etiologies, antenatal and postnatal presentation, management, and prognosis of these anomalies. Differential diagnoses are discussed as several syndromes may include CAKUT as a phenotypic component and renal dysplasia may occur in some ciliopathies, tumor predisposition syndromes, and inborn errors of metabolism. Diagnosis and genetic counseling for CAKUT are challenging, due to the extensive variability in presentation, genetic and phenotypic heterogeneity, and difficulties to assess postnatal lung and renal function on prenatal imaging. The review highlights the importance of perinatal autopsy and pathological findings in surgical specimens to establish the diagnosis and prognosis of CAKUT. The indications and the type of genetic testing are discussed. The aim is to provide essential insights into the practical approaches, diagnostic processes, and genetic considerations offering valuable guidance for pediatric and perinatal pathologists.

Improving prenatal diagnosis through standards and aggregation

Advances in sequencing and imaging technologies enable enhanced assessment in the prenatal space, with a goal to diagnose and predict the natural history of disease, to direct targeted therapies, and to implement clinical management, including transfer of care, election of supportive care, and selection of surgical interventions. The current lack of standardization and aggregation stymies variant interpretation and gene discovery, which hinders the provision of prenatal precision medicine, leaving clinicians and patients without an accurate diagnosis. With large amounts of data generated, it is imperative to establish standards for data collection, processing, and aggregation. Aggregated and homogeneously processed genetic and phenotypic data permits dissection of the genomic architecture of prenatal presentations of disease and provides a dataset on which data analysis algorithms can be tuned to the prenatal space. Here we discuss the importance of generating aggregate data sets and how the prenatal space is driving the development of interoperable standards and phenotype-driven tools.

Ethics experts and fetal patients: a proposal for modesty

Background

Ethics consultation is recognized as an opportunity to share responsibility for difficult decisions in prenatal medicine, where moral intuitions are often unable to lead to a settled decision. It remains unclear, however, if the general standards of ethics consultation are applicable to the very particular setting of pregnancy.

Main text

We sought to analyze the special nature of disagreements, conflicts and value uncertainties in prenatal medicine as well as the ways in which an ethics consultation service (ECS) could possibly respond to them and illustrated our results with a case example. Ethics facilitation and conflict mediation, currently, have no broadly consented normative framework encompassing prenatal diagnosis and therapy as well as reproductive choice to draw on. Even so, they can still be helpful instruments for ethically challenging decision-making in prenatal medicine provided two additional rules are respected: For the time being, ECSs should (a) refrain from issuing content-heavy recommendations in prenatal medicine and (b) should not initiate conflict mediations that would involve the pregnant woman or couple as a conflict party.

Conclusion

It seems to be vital that ethics consultants as well as health care professionals acknowledge the current limitations and pitfalls of ethics consultation in prenatal medicine and together engage in the advancement of standards for this particularly complex setting.