{"id":1416,"date":"2026-08-24T17:40:00","date_gmt":"2026-08-24T08:40:00","guid":{"rendered":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-08-24-five-year-brain-organoids-clock-en\/"},"modified":"2026-08-24T17:40:00","modified_gmt":"2026-08-24T08:40:00","slug":"2026-08-24-five-year-brain-organoids-clock-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-08-24-five-year-brain-organoids-clock-en\/","title":{"rendered":"Small brain-cell cultures tracked five years of development, but they are not complete brains."},"content":{"rendered":"

2026-08-24 17:40 KST<\/strong><\/p>\n

When the researchers cultured a small cerebral cortex cell model made from human stem cells for over five years, the cells’ gene activity and DNA markers matured in accordance with the actual time that had passed. Older progenitor cells also skipped developmental stages they had already passed.<\/p>\n

Although these cell models are called brain organoids, they are not complete brains. It lacks blood vessels, sensory input, and many of the body’s tissues, some nerve cells were shrunk during organ culture, and the study did not measure consciousness or thinking.<\/p>\n

how long did you observe<\/h2>\n

The new analysis included 34 organoids cultured from 6 months to 5 years, and compared 110 cells compared to more than 420,000 cells when combined with earlier data collected earlier. The researchers checked gene expression, DNA methylation, cell shape and electrical activity at multiple time points.<\/p>\n

What does it mean for cells to keep track of time?<\/h2>\n

We used the gene bundles and DNA methylation marks that change with age like a clock. The predicted age of the organoids matched strongly with the period of culture. This does not mean that the cells know calendar dates, but that the developmental program proceeds in order from year to year, even outside the body.<\/p>\n

\"Small
This AI-generated image explains the topic; it is not a photograph of the actual event, observation, or experiment.<\/figcaption><\/figure>\n

What did old cells remember?<\/h2>\n

The researchers created a model that mixed progenitor cells of different ages. Cells cultured for long periods of time skipped the step of regenerating early neurons and quickly created cell types that would normally emerge later. The researchers interpreted this as temporal memory from an already past developmental stage.<\/p>\n

Why is it helpful for brain research?<\/h2>\n

The human brain takes nearly 20 years to mature, making postnatal changes difficult to see in animal models or cultures lasting just a few months. Long-lived organoids can be a tool to examine some processes in later development, neurodevelopmental diseases, and cellular aging in a chronological order.<\/p>\n

What needs to be improved further<\/h2>\n

Even after five years, not all cell types remain in the same proportions as in the real brain. In particular, as the proportion of neurons decreased, additional experiments were needed to change the culture medium. Next studies should add missing elements, such as blood vessels, immune cells, and sensory inputs, and see if the results are replicated across multiple stem cell lineages.<\/p>\n

Primary sources and independent checks<\/h2>\n

Nature original paper<\/a><\/p>\n

NIH official research release<\/a><\/p>\n

Broad Institute independent institutional summary<\/a><\/p>\n

Nature Portfolio independent editorial summary<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

When the researchers cultured cerebral cortical organoids made from human stem cells for over 5 years, gene activity and DNA markers matured in accordance with the actual cultivation time. It is not evidence of a complete brain or consciousness.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-1416","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/1416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=1416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}