Talk:Assembloid

Request for corrections: Historical timeline and citations

I am requesting this edit because I am an employee of IMBA (Institute of Molecular Biotechnology) and believe it is appropriate for a neutral third party to review these corrections.

Collapsed request

I have noticed that the current history section of this article attributes the development of organoid fusion solely to the Pașca lab and claims the term "assembloid" was coined in 2017. While this is a common misconception, the 2017 paper makes no mention of the term “assembloid” WP:FAILEDVERIFICATION.

Secondary sources (reviews by Qian et al. 2019 and Watanabe et al. 2020) establish that the technology was developed simultaneously by three independent laboratories (Pașca, Knoblich, and Park) in 2017. The term "assembloid" was not coined until 2018.

I propose the following 3 changes to restore historical accuracy and Neutral Point of View (WP:NPOV), supported by these secondary sources, and to reduce reliance on primary literature. I also propose separating the generation of Assembloids into two sections (History and Generation...) to improve the clarity of the page.

1. Update Lead Section: Establish the 2017 simultaneous development and fix the reference to the term coining.

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An assembloid is a 3D in vitro cell culture model formed by the integration of at least one organoid with another organoid, spheroid, or specific cultured cell type to recapitulate structural and functional properties of an organ. They are typically derived from induced pluripotent stem cells. Assembloids have been used to study cell migration, neural circuit assembly, neuro-immune interactions, metastasis, and other complex tissue processes.

The methodology for fusing regionalised organoids was established in 2017 through simultaneous work by the laboratories of Sergiu P. Pașca, Jürgen Knoblich, and In-Hyun Park. The term "assembloid" was subsequently proposed in 2018 to standardise the nomenclature for these multi-component systems.

2. Update "History" and "Generation" Sections: Separate the historical discovery from the technical generation method.

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History

The development of assembloids emerged from the need to model complex tissue interactions that single-region organoids could not capture. In 2017, methods for fusing regionally specified organoids were described independently by three laboratories (Pașca, Knoblich, and Park). These approaches demonstrated the fusion of dorsal and ventral forebrain spheroids/organoids (Birey et al.; Bagley et al.) or the fusion of MGE-specified organoids (Xiang et al.).

While these studies established the underlying technology, they originally used terms such as "Fused Organoids" or "Assembled spheroids." The term "assembloid" was coined in 2018 by Sergiu Pașca to unify the nomenclature. This terminology was formally adopted in 2022 by a field-wide consensus group to encompass these fused systems.

Generation of assembloids

Assembloid formation starts with the generation of organoids. Initially, human induced pluripotent stem cells (hiPS) are aggregated to generate regionalised organoids through directed differentiation. There are multiple ways in which organoids can be assembled. Regionalised organoids can be placed in close proximity, resulting in their fusion to generate multi-region assembloids. Alternatively, organoids can be assembled by co-culture with other cell lineages, such as microglia or endothelial cells, or with tissue samples from animal dissection, leading to multi-lineage assembloids. Lastly, organoids can be assembled with morphogenic or organiser-like cells, thus generating polarised assembloids.

3. Addition to "Types" section: Add non-neural examples (Bladder/Gastrointestinal) which are currently missing.

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Endodermal and mesodermal assembloids

While initial assembloid models focused on the nervous system, the technology has been adapted to model complex epithelial-stromal interactions in other organs.

Bladder Assembloids: In 2020, Kim et al. (Park Lab) generated bladder assembloids by assembling pluripotent stem cell-derived urothelium with stromal and muscle components. Unlike neural models, which often fuse similar tissue types, this approach integrated three distinct lineages to successfully recapitulate the multi-layered architecture of the bladder. These assembloids have been used to study urothelial carcinoma (bladder cancer) and tissue regeneration.

Gastrointestinal Models: Multi-lineage assembly has also been used to introduce mesenchymal niches to intestinal organoids. For example, fusing epithelium with mesenchymal cells improves the maturation of the organoids and allows for the modelling of inflammatory responses and crypt-niche interactions. TMinch (talk) 10:56, 29 January 2026 (UTC)

 Not done: The {{edit semi-protected}} template is for requesting changes to semi-protected pages. For conflict of interest requests, please use {{Edit COI}} instead. {{GearsDatapack|talk|contribs}} 11:00, 29 January 2026 (UTC)

Request for corrections: Historical timeline and citations

Withdrawn by requester. I decided it would be better to submit smaller, more manageable requests.TMinch (talk) 09:25, 6 February 2026 (UTC)

Sorry for using the incorrect template please find my edit request below:

Extended content

I am requesting this edit because I am an employee of IMBA (Institute of Molecular Biotechnology) and believe it is appropriate for a neutral third party to review these corrections.

Edit: Adding priority guidance for reviewers. - TMinch (talk) 16:29, 5 February 2026 (UTC)

Priority: The most critical correction is fixing the claim that "assembloid" was coined in 2017, as this is not supported by the cited source (WP:FAILEDVERIFICATION). The other changes provide important historical context about simultaneous development by three labs.

I have noticed that the current history section of this article attributes the development of organoid fusion solely to the Pașca lab and claims the term "assembloid" was coined in 2017. While this is a common misconception, the 2017 paper makes no mention of the term “assembloid” WP:FAILEDVERIFICATION.

Secondary sources (reviews by Qian et al. 2019 and Watanabe et al. 2020) establish that the technology was developed simultaneously by three independent laboratories (Pașca, Knoblich, and Park) in 2017. The term "assembloid" was not coined until 2018.

I propose the following 3 changes to restore historical accuracy and Neutral Point of View (WP:NPOV), supported by these secondary sources, and to reduce reliance on primary literature.

1. Update Lead Section: Establish the 2017 simultaneous development and fix the reference to the term coining. ----

An assembloid is a 3D in vitro cell culture model formed by the integration of at least one organoid with another organoid, spheroid, or specific cultured cell type to recapitulate structural and functional properties of an organ. They are typically derived from induced pluripotent stem cells. Assembloids have been used to study cell migration, neural circuit assembly, neuro-immune interactions, metastasis, and other complex tissue processes.

The methodology for fusing regionalised organoids was established in 2017 through simultaneous work by the laboratories of Sergiu P. Pașca, Jürgen Knoblich, and In-Hyun Park. The term "assembloid" was subsequently proposed in 2018 to standardise the nomenclature for these multi-component systems.

2. Update "History" and "Generation" Sections: Separate the historical discovery from the technical generation method. ----

History

The development of assembloids emerged from the need to model complex tissue interactions that single-region organoids could not capture. In 2017, methods for fusing regionally specified organoids were described independently by three laboratories (Pașca, Knoblich, and Park). These approaches demonstrated the fusion of dorsal and ventral forebrain spheroids/organoids (Birey et al.; Bagley et al.) or the fusion of MGE-specified organoids (Xiang et al.).

While these studies established the underlying technology, they originally used terms such as "Fused Organoids" or "Assembled spheroids." The term "assembloid" was coined in 2018 by Sergiu Pașca to unify the nomenclature. This terminology was formally adopted in 2022 by a field-wide consensus group to encompass these fused systems.

Generation of assembloids

Assembloid formation starts with the generation of organoids. Initially, human induced pluripotent stem cells (hiPS) are aggregated to generate regionalised organoids through directed differentiation. There are multiple ways in which organoids can be assembled. Regionalised organoids can be placed in close proximity, resulting in their fusion to generate multi-region assembloids. Alternatively, organoids can be assembled by co-culture with other cell lineages, such as microglia or endothelial cells, or with tissue samples from animal dissection, leading to multi-lineage assembloids. Lastly, organoids can be assembled with morphogenic or organiser-like cells, thus generating polarised assembloids.

3. Addition to "Types" section: Add non-neural examples (Bladder/Gastrointestinal) which are currently missing. ---- Endodermal and mesodermal assembloids

While initial assembloid models focused on the nervous system, the technology has been adapted to model complex epithelial-stromal interactions in other organs.

Bladder Assembloids: In 2020, Kim et al. (Park Lab) generated bladder assembloids by assembling pluripotent stem cell-derived urothelium with stromal and muscle components. Unlike neural models, which often fuse similar tissue types, this approach integrated three distinct lineages to successfully recapitulate the multi-layered architecture of the bladder. These assembloids have been used to study urothelial carcinoma (bladder cancer) and tissue regeneration.

Gastrointestinal Models: Multi-lineage assembly has also been used to introduce mesenchymal niches to intestinal organoids. For example, fusing epithelium with mesenchymal cells improves the maturation of the organoids and allows for the modelling of inflammatory responses and crypt-niche interactions.

References

TMinch (talk) 11:06, 29 January 2026 (UTC)

Remove bad reference and update lead to WP:NPV

I work at the same institute as one of the involved researchers so I'm aware that my COI makes it inappropriate to just go in a fix things that I think are wrong. I have tried to provide all the context for a neutral editor to assess the suggested changes.

• Specific text to be added or removed:

remove: The term "assembloid" was coined by Sergiu P. Pașca's lab in 2017.

replace with: The method for fusing organoids was a simultaneous discovery in 2017 by 3 labs: Pașca, Knoblich, and Park. The term "assembloid" was later coined to standardise the terminology.

• Reason for the change: Reference doesn't match claim, statement is not verifiable. There seems to be a lot of self referencing in the lead paragraph and reframing of history using primary sources. I think this change would make it a bit more neutral than it is currently. I removed the "was coined by" because it seems a bit promotional for an article lead and might be better suited to a history section, but I'm happy to keep it in if a different editor thinks it's appropriate.

• References supporting change:

Simultaneous discovery: specific quote from review: "To improve modelling of inter-regional interactions, several groups concurrently developed new approaches, first differentiating hPSCs into different brain region-specific organoids separately, and then fusing them together to form organoids with multiple distinct region identities in a controlled manner (Bagley et al., 2017; Birey et al., 2017; Xiang et al., 2017)."

First use of term assembloid: This 2018 review is the first time I can find the use of the term assembloid. Pasca also introduces it as if it is a new term: "to address this issue, we introduced controlled assembly of 3D brain cultures in what I will refer to as brain assembloids"

TMinch (talk) 10:21, 6 February 2026 (UTC) TMinch (talk) 10:21, 6 February 2026 (UTC)

Done   MetalBreaksAndBends   (talk) (contribs) 14:58, 6 February 2026 (UTC)

update sentence to improve WP:NPV

I have a COI as I work at the same institute as one of the researchers. There is some phrasing in the "Generation of assembloids" section that makes it inconsistent and also violates WP:NPV. I matched the references to the originals so they shouldn't need changing, just moving around.

• Specific text to be added or removed:

remove: Assembloids joining ventral and dorsal forebrain neural organoids demonstrated that cortical interneurons migrate and integrate into synaptically connected cortical microcircuits. This was confirmed by multiple research groups applying similar approaches to model regionalized organoid interactions and study interneuron migration.

replace with: These early assembloids joined together regionalised neural organoids to model interneuron migration and circuit formation. Fusions of dorsal and ventral forebrain organoids were used to study the migration of GABAergic interneuron migration from the ventral to the dorsal forebrain. Both Dorsal-ventral fusions and fusions of medial ganglionic eminence (MGE) and cortical organoids demonstrated integration of migrating interneurons into functional networks.

Note: It might be good to move the header "Generation of assembloids" to just above "Assembloid formation starts...." And then add a "history" section header where "Generation of assembloids" was

• Reason for the change: The previous section and sentences correctly show the simultaneous discovery, but then two of the papers here are said to have "confirmed" the discovery, trying to add weight to the first paper and violating the WP:NPV. I reworded the two sentences into a more balanced view. These papers are generally cited together except in reviews written by the authors involved.

• References supporting change:

Simultaneous discovery: specific quote from review: "To improve modelling of inter-regional interactions, several groups concurrently developed new approaches, first differentiating hPSCs into different brain region-specific organoids separately, and then fusing them together to form organoids with multiple distinct region identities in a controlled manner (Bagley et al., 2017; Birey et al., 2017; Xiang et al., 2017)."

TMinch (talk) 16:28, 10 February 2026 (UTC) TMinch (talk) 16:28, 10 February 2026 (UTC)

Hi TMinch, I have reviewed this request; you can go ahead and implement these changes as requested, including the proposed changes for the section headers. Best, Spencer^T•C 20:19, 31 March 2026 (UTC)

Hi Spencer, Thanks for taking the time to look at this. Sorry for the late reply, I was away. I have implemented the changes as discussed. I think the headers really improve the flow and readability of the article. Best, TMinch (talk) 09:12, 15 April 2026 (UTC)

Proposed improvements to definition and sourcing

I would like to request a few narrow changes to improve sourcing and neutrality.

Definition section

Replace: "An assembloid is an in vitro model that combines two or more organoids, spheroids, or cultured cell types to recapitulate structural and functional properties of an organ."

With: "An assembloid is a self-organizing three-dimensional system formed by the functional integration of multiple organoids or by combining organoids with specialized cell types or primary tissue explants."

Reason: Recent consensus and review sources define assembloids through self-organization and functional integration, rather than simple combination: Nature 2022

Remove: "The method for fusing organoids was a simultaneous discovery in 2017 by three labs. The term assembloid was later coined to standardize terminology."

Reason: Repetitive, as the discovery is covered in the subsequent paragraph.

Section on "Generation of assembloids"

Replace: "Assembloids were simultaneously discovered three times in 2017 by Pașca, Knoblich, and Park. With Pașca going on to coin the term. “

With: "Early published studies joined regionalized forebrain organoids to model neuronal migration . The term assembloid was introduced by Pașca and was later formalized in a nomenclature consensus .”

Reason: This change removes a categorical and disputed priority claim and replaces it with wording that better reflects the review literature, which describes early published studies joining regionalized forebrain organoids to model neuronal migration and related interactions. It also keeps the terminology point, adding the 2022 nomenclature consensus for later formalization. I believe this is a more neutral and source-based summary. Assembloid (talk) 22:49, 6 April 2026 (UTC)

Hi, thanks for discussing this on the talk page. Regarding these changes:

Support the definition changes: I think this change to the description is fine and should be implemented by a neutral editor. But I do not agree with removing the simultaneous discovery statements (see below)

Oppose the lead and history changes: The point of the lead (WP:LEAD) is to summarise the article, so there will be some duplication of the information. In regard to the simultaneous discovery, these changes were implemented by a neutral editor to address heavy bias in the article, which was already in violation of WP:NPOV. As you can see in the previous discussion, the current wording is supported by secondary literature, "several groups concurrently developed new approaches.... (Bagley et al., 2017; Birey et al., 2017; Xiang et al., 2017)". Changes to these sections would increase the ambiguity of the discovery while still attempting to link it to the Pasca group by retaining the terminology statements.

TMinch (talk) 10:00, 15 April 2026 (UTC)

I believe the edits I proposed would make the page more neutral and more accurate. The current wording makes a strong history claim that not all review articles support. Some secondary sources describe the early work through the first published studies showing neuronal migration and functional integration, rather than as a single “simultaneous discovery” (Brazovskaja et al, Current Opinion in Biotechnology, 2019; Chen et al, Frontiers in Cellular Neuroscience, 2020). For this reason, it is more appropriate to use simpler wording about what the early studies showed. Assembloid (talk) 20:51, 16 April 2026 (UTC)

I don't think the current wording is controversial; they're listed in the order published. The review cited states that concurrent discovery is due to the close nature of the publications. The review you provided (Neuroscience 2020) cites the papers together without differentiating them, supporting this position. Thanks for finding it, we could add this citation to the statement. As for the Brazovskaja et al., it is talking about a specific topic, migration and integration, when referencing the Birey et al. paper, not the organoid fusions themselves. This is not surprising as assembloids are not the feature of the article, as it is about single cell transcriptomics on organoids and their derivatives, such as assembloids. One of the other papers doesn't contain single-cell transcriptomics, so it would be weird to mention it in that review. TMinch (talk) 16:47, 17 April 2026 (UTC)

The issue is that the current wording is stronger than the mixed secondary literature supports. The review currently cited says the approaches were “concurrently developed,” while other independent secondary sources, which review the same literature from different angles, describe the early work differently, including through the intial published studies showing neuronal migration and functional integration. Because these are all review level sources assessing the literature, a neutral summary should avoid the more categorical “simultaneous discovery” wording. Assembloid (talk) 20:36, 11 May 2026 (UTC)