Showing posts sorted by date for query sperm. Sort by relevance Show all posts
Showing posts sorted by date for query sperm. Sort by relevance Show all posts

Saturday, May 31, 2025

Children adopted from China can now find birth-family connections via DNA sites

 Like children conceived with the help of anonymous sperm donors, adopted children can use DNA websites to search for family members.  For children adopted from China during the one-child policy period, that can mean finding siblings and even parents who may have put them up for adoption under duress.

The New Yorker has the story:

The Chinese Adoptees Who Were Stolen. As thousands of Chinese families take DNA tests, the results are upending what adoptees abroad thought they knew about their origins.
By Barbara Demick   May 23, 2025

"Back when China started allowing foreign adoptions, in the early nineties, there was no expectation that adoptees would ever connect with their birth families. The babies, mostly girls, were said to have been picked up at train stations, markets, and roadsides, where they had been abandoned by families fearful of the ruthlessly enforced one-child policy. They had no identification. Even the orphanages didn’t know who they were. And China, with its staggeringly large population—more than one billion—was so far away from the adoptive parents. An adoptee finding her birth family seemed no more likely than locating a particular grain of sand.

"Those assumptions have been upended in recent years. Like it or not, and many do not, technology has compressed this vast world into an interconnected village. Adoptees who could only fantasize about their birth families are now identifying them through DNA testing and chatting with them online. Even more unexpected, Chinese birth parents and, sometimes, adult siblings are seeking out and finding their lost kin who were adopted abroad."

Saturday, April 26, 2025

Prolific sperm donation and incest risk in the Netherlands

 The Guardian has the story:

‘Medical calamity’: dozens of Dutch sperm donors fathered at least 25 children.  Discovery that clinics have been breaking rules raises genetic risks in such a small, densely populated country  by Jon Henley 

"At least 85 sperm donors in the Netherlands have fathered 25 or more children, the national gynaecology and obstetrics organisation has said, after a new registration system showed fertility clinics have been breaking existing rules on sperm donation for decades.

"The NVOG said on Monday that some clinics had deliberately used sperm batches more than 25 times, exchanged sperm without the necessary paperwork or donors’ knowledge, and allowed the same donors to donate sperm at multiple clinics.

“The number of so-called ‘mass donors’ should be zero,” gynaecologist Marieke Schoonenberg told the TV show Nieuwsuur. “On behalf of the whole profession, we wish to apologise. We didn’t do things as they should have been done.”

"A law aimed at reducing the risk of involuntary incest and inbreeding should have barred donors from fathering more than 25 children in the Netherlands since 1992, but proved difficult to enforce because of strict privacy laws.

"The limit was lowered to 12 in 2018, but the means to enforce it – a national register of donors and mothers with a code system ensuring sperm from the same donor cannot be used in more than 12 conceptions – came into force, retroactively, only in April.

“As a result, we now know, for the first time, the exact number of children per donor,” Schoonenberg said. Since 2004, when donors’ right to anonymity was lifted, the data showed there had been at least 85 “mass donors” (defined as at least 25 conceptions) in the Netherlands, she said.

"Most were biological father to between 26 and 40 children, Schoonenberg said, although several had between 50 and 75. Among them were at least 10 fertility doctors, including Jan Karbaat, who illegally fathered at least 81 children at his clinic.

"The most prolific donor was Jonathan Jacob Meijer, the subject of the Netflix documentary The Man with 1,000 Kids, who is known to have fathered at least 550 children worldwide. More than 100 of Meijer’s children were conceived in Dutch clinics.

"Ties van der Meer, of Stichting Donorkind, a foundation that helps children trace their donor fathers, said the findings were a “medical calamity”. The data meant there were probably at least 3,000 children in the Netherlands with 25 or more half-brothers and sisters, he said."



Monday, January 20, 2025

Emerging Technologies to Stop Biological Time: The Ethics of Refrigeration

 Here's a special issue of the Journal of Law, Medicine & Ethics, exploring the promise and peril of refrigeration (as applied e.g. to organ transplantation). 

Here's how the introduction to the issue begins:

" Human beings depend on biological materials for survival — everything from food to medical interventions such as organ transplantation, to the environments in which we live. So it is no surprise that techniques to avoid the deterioration of biological materials have been used since ancient times.Reference Knorr and Augustin1 Cooling is one of the oldest techniques. Indeed, most of us now live with a cooling machine — a refrigerator — in our kitchens. But the function of those machines is primarily to retard the spoilage of materials that are already in the process of disintegrating: fruit that has already been harvested, meat from beef and chickens already slaughtered, and milk already derived from cows.

Beginning in the mid-20th century, scientists began to develop techniques for cryopreservation with more ambitious goals in mind. Instead of merely slowing the deterioration of biological materials, techniques could be developed to preserve living materials for prolonged periods of time and then allow their revival and use at a future time and place. An early application was cryopreservation of sperm (both human and animal), allowing sperm banking and later use.Reference Walters, Pacey and Tomlinson2 Yet conventional cryopreservation had its limits. Prolonged preservation of solid organs for transplantation was among the applications that proved elusive."

Emerging Technologies to Stop Biological Time: The Ethical, Legal & Policy Challenges of Advanced Biopreservation   Volume 52 - Issue 3 - Fall 2024
Latest issue of Journal of Law, Medicine & Ethics 

Introduction

Symposium Articles

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Earlier post (on what turns out to have been a seminal paper: "Since Giwa and colleagues reviewed the emerging field of biopreservation in biomedicine in 2017, progress has been swift."):

Monday, June 12, 2017 Organ preservation could bring big changes to transplantation