Chapter 23 slides

Chapter 23: Reproductive Technologies

In Vitro Fertilization (IVF)

  • IVF allows parents to select chromosomes and screen for disease-causing variants.

  • Involves sperm meeting oocyte in a controlled environment.

Bioethics: Gametes Post-Mortem

Definition of Gametes

  • Gametes: packets containing one copy of a person's genome.

  • Postmortem gamete retrieval allows deceased individuals to become parents after death.

Historical Case

  • First postmortem sperm retrieval in a couple whose father died unexpectedly.

  • The sperm was cryogenically preserved and used to conceive their daughter, the first case of such a scenario.

  • U.S. servicemen utilize sperm preservation before deployment due to concerns about exposure to infertility-causing agents.

Legal and Ethical Issues

Case Analyses

  • A woman successfully conceived but faced legal issues regarding survivor benefits.

  • Courts made rulings on the definitions and rights of children conceived after a parent's death.

  • Another case raised the potential for postmortem oocyte retrieval and the complex ethical ramifications of extracting gametes from individuals not in a clear state of consent.

Assisted Reproductive Technologies (ART) and Their Issues

Overview of ART

  • ART encompasses methods to assist conception for individuals facing infertility.

  • Includes in vitro fertilization (IVF), intrauterine insemination (IUI), and more.

  • Postmortem gamete retrieval has significant ethical challenges regarding consent.

Discussion Questions

  1. How does this scenario differ from cases of pregnant women in comas?

  2. What implications arise for couples who already have children?

  3. Should benefits cover embryos or gametes?

  4. How could postmortem retrieval be misused?

Savior Siblings

Innovative Reproductive Techniques

  • Techniques such as egg donation, sperm retrieval from cancer patients, and specific cases like Lisa and Jack Nash’s need for a savior sibling.

  • Their child Adam was conceived to save his sister Molly with Fanconi Anemia.

Infertility and Subfertility

Definitions

  • Infertility: inability to conceive after a year of trying without contraception.

  • Subfertility: couples who take longer to conceive but can still achieve pregnancy.

  • Influences: Male and female factors contribute equally to infertility rates.

Male Infertility

Detection and Treatment Challenges

  • Easier to detect but often more complex to treat.

  • Types: azoospermia (no sperm production), oligospermia (low sperm count).

  • Causes include immune issues, varicocele, tight garments, and environmental factors (like laptop heat).

Genetic Factors

  • Many male infertility cases are genetic, particularly deletions on the Y chromosome affecting spermatogenesis.

  • Sperm banking and pooling techniques for low sperm count can aid in conception via assisted reproductive techniques.

Female Infertility

Causes and Analysis

  • Infertility linked to irregular menstruation and anatomical or hormonal issues.

  • Potential issues include hormonal imbalances, blockage of tubes, and uterine irregularities.

  • Age significantly factors into female fertility, with the risk of aneuploidy increasing as women age.

Testing for Infertility

Diagnosis Procedures

  • The man is typically checked first due to ease.

  • Fertility evaluations are comprehensive, assessing both partners.

  • Psychological aspects also play a role in some unexplained infertility cases.

Assisted Reproductive Technologies

ART Overview

  • ART includes various methods like IVF, IUI, and donor gamete use.

  • Procedures evolved from animal studies and are performed with fresh or frozen materials.

Intrauterine Insemination (IUI)

  • Involves placing sperm into the cervix or uterus with a 5-15% success rate.

  • First documented IUI occurred in 1790, with advancements in sperm storage in the 1950s.

Surrogate Motherhood

Definition and Types

  • Surrogate carries a pregnancy for another couple, could be gestational or genetic mother.

  • Legal and emotional complexities arise concerning custody.

In Vitro Fertilization (IVF) Procedure

Overview

  • IVF involves fertilizing an oocyte outside the body and transferring embryos to the uterus.

  • First successful IVF birth in 1978.

Cost and Regulations

  • Average cost around $12,000, excluding potential medication costs.

  • Regulatory standards vary, and result success rates depend on various factors, including age.

Preimplantation Genetic Diagnosis (PGD)

Concept

  • PGD tests embryos for genetic issues before implantation.

  • Offers about a 97% accuracy rate in detecting genetic mutations.

Techniques Evolution

  • Sequential polar body analysis provides genetic insight before fertilization through analysis of the polar body.

Managing Extra Embryos

Options Available

  • Extra embryos from ART can be frozen, discarded, or donated.

  • Ethical concerns regarding the fate of unused embryos and appropriate consent are critically discussed.