Genetic Counseling and Assisted Reproductive Technologies

The genetic basis of male and female infertility

This review provides a comprehensive overview of the genetic factors underlying male and female infertility. Infertility affects an estimated one in six couples worldwide, with both male and female factors contributing equally to its prevalence. Approximately, 50% of infertility cases are attributed to genetic causes. We explore three main categories of genetic causes: chromosomal abnormalities, monogenic disorders, and syndromic conditions. Chromosomal causes, including numerical and structural aberrations, are discussed with a focus on their impact on gametogenesis and reproductive outcomes. We review key monogenic causes of infertility, highlighting recent discoveries in genes critical for gonadal development, gametogenesis, and hormonal regulation. Syndromic conditions affecting fertility are examined, highlighting their impact on reproductive function. Throughout the review, we address the challenges in identifying genetic mechanisms of infertility, particularly focusing on the intricate processes involved in oogenesis and spermatogenesis. We also discuss how advancements in genetic testing, such as next-generation sequencing (NGS) and genome-wide association studies (GWAS), have significantly enhanced our understanding of idiopathic infertility and promise further insights in the future. We also discuss the clinical implications of genetic diagnoses, including the role of preimplantation genetic testing (PGT) and genetic counseling in reproductive medicine. This review synthesizes current knowledge on the genetic basis of infertility, providing a comprehensive overview of chromosomal, monogenic, and syndromic causes. It aims to offer readers a solid foundation for understanding the complex genetic factors underlying reproductive disorders.

Advances in fertility preservation and pregnancy care for transplant patients

Fertility preservation and pregnancymanagement are critical considerations for patients undergoing organtransplantation. Innovations in assisted reproductive technologies, hormonalmodulation, and personalized medicine have expanded options for these patients, who face unique challenges due to immunosuppressive therapy and organ functionconcerns. This mini-review explores advancements in cryopreservationtechniques, pre-conception counseling, and multidisciplinary strategies forsafe pregnancies post-transplantation. Emphasis is placed on balancing maternalhealth, graft function, and fetal outcomes. The integration of reproductive andtransplant medicine is paving the way for improved quality of life andreproductive autonomy for this patient population.

The importance of genetic counselling for turner syndrome transition

The healthcare transition (HCT) is the process of planning, monitoring, and adjusting the clinical management from children's care to adult specialists. Although this practice is common for all children, it is especially crucial (and challenging) for those with chronic disorders and genetic conditions that also involve mental health issues, requiring a multidisciplinary approach. In this review, we aim to assess the current status of transition for girls and young women with Turner syndrome (TS) as a model as it is one of the most common sexual chromosomal aneuploidies. We first describe the syndrome highlighting some of the challenges regarding behavioural, neurodevelopmental, and mental health characteristics that must be addressed for a successful HCT. Finally, we emphasize the importance of genetic counselling within multidisciplinary groups for the successful implementation of HCT, especially for girls and women with TS, to facilitate their adaptation and adhesion to the transition process.

Family misfortune caused by hereditary bias: a reflection on mitochondrial disease diagnosis in a family

AIM

Assisted reproductive technology (ART) is an invaluable strategy for preventing the inheritance of genetic disorders and promoting the birth of healthy children. Nevertheless, the general public's limited understanding of genetics and low awareness of available services obstruct effective utilization of genetic counseling. Our analysis of a family affected by mitochondrial genetic disease aims to improve public understanding of genetic knowledge and the importance of genetic counseling.

METHODS

We gathered comprehensive data on a family with mitochondrial disease and scrutinized the genetic sequencing and diagnostic procedures used to identify mitochondrial disease within the family.

RESULTS

In a case involving a family with two daughters, both began to exhibit symptoms such as abnormal gait, myodystonia, and excessive fatigue at the age of 4. These symptoms were incorrectly assumed to be paternally inherited, as the mother believed the father had a mild intellectual disability. As a result, the family opted for ART, specifically in vitro fertilization (IVF) with donor sperm, without thorough genetic counseling or a conclusive diagnosis for the children. Despite these precautions, the son born from IVF presented with symptoms mirroring his sisters' at the age of 6, including typical MRI abnormal signals in the bilateral basal ganglia. Furthermore, the eldest daughter's naturally conceived child also started to show identical symptoms by the age of 3. Subsequent genetic testing revealed a homoplasmic pathogenic mutation in the MT-ND6 gene (m.14459G>A), confirming that the dystonia was maternally inherited, with the mother exhibiting an 89.2% heteroplasmic variation in the same gene.

CONCLUSIONS

This case study demonstrates the significant consequences of a lack of genetic knowledge and prevailing misconceptions when applying ART. It underscores the urgent need to bolster genetic literacy and emphasizes the vital importance of informed decision-making within genetic healthcare services.

The importance of on-site genetic counseling for prospective assisted reproductive technology patients

PURPOSE

To assess the value of having an onsite genetic counseling service integrated into an assisted reproductive technology (ART) center.

METHODS

Since January 2021, we have offered genetic counseling at our ART center for couples whose medical history suggests risk of transmission of a genetic disorder. The percentage of couples referred for genetic counseling, the distribution of couples according to reasons for consultation, the mode of transmission in cases of Mendelian disorders, and the frequency of mutations for those with identified genetic disorders were determined.

RESULTS

In an 18-month period, 150 of 1340 couples (11.2%) enrolled for ART treatment were referred to the genetic counseling unit. Two-thirds (99/150, 66.0%) were referred for a known genetic risk, a family history of a genetic disorder or chromosomal abnormality, a serious condition of unknown cause, or consanguinity. The remaining couples had a putative genetic risk (diminished ovarian reserve, high incidence of oocyte immaturity, recurrent abortion, or severe male infertility). Of the 99 with known genetic risk, 62 (62.7%), were approved for ART treatment, 23 (23.2%) were recommended prenatal or preimplantation testing, and 14 (14.1%) were referred for further testing before undergoing ART.

CONCLUSIONS

Our findings reveal great value in having an on-site genetic counseling unit for referral of ART patients. Such a unit makes the ART process smoother and safer for couples, and it lightens the burden of ART staff by removing responsibilities for which they are neither trained, nor should they have to assume.

Assisted reproductive technology: Short- and long-term outcomes

Assisted reproductive technology (ART) includes fertility treatment in which either eggs or embryos are handled outside a female's body to promote successful pregnancies and healthy offspring. Current ART procedures encompass in vitro fertilization with or without intracytoplasmic sperm injection. The most common complication of ART is related to the consequences of multiple pregnancy, which can be prevented or minimized by reducing the number of embryos transferred to the uterus, commonly single embryo transfer. ART has been shown to be variably associated with adverse short- and long-term perinatal outcomes, including cerebral palsy, autism, neurodevelopmental imprinting disorders, and cancer. However, there is uncertainty as to whether reported problems are related to the ART procedure itself, to factors related to infertility, to other medical and environmental factors, or a combination thereof. From a pathophysiological perspective, whether ART alters epigenetic mechanisms of gene expression, leading to later developmental, medical, and behavioral disorders, is an area of active investigation. With the meticulously conducted short- and long-term outcome studies completed so far, overall, and after controlling for multiple gestations and preterm delivery, the results suggest that ART is a safe procedure, offering hope to many parent(s) wishing for a healthy child. This paper highlights ART methods and the risk factors and confounders in the interpretation of short- and long-term outcome data, providing the reader with a means to evaluate findings and conclusions of outcome studies. WHAT THIS PAPER ADDS: Assisted reproductive technology (ART) is a relatively safe procedure. Single embryo implantation optimizes outcome. Informed consent, including the risks and benefits of ART, should be required. Ongoing longitudinal studies are necessary to fully understand ART outcomes.