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'Multi-omics' adds new cell to immune family tree
20 October 2020
WEHI researchers have used powerful ‘single cell multi-omics’ technologies to discover a previously unknown ancestor of T and B lymphocytes, which are critical components of our immune system.
Dr Daniela Zalcenstein and Mr Luyi Tian have used
'single cell multi-omics' to discover a new ancestor of
immune T and B cells
Using an approach akin to breaking a sports team’s performance down to the individual player statistics, the researchers looked at multiple aspects of single developing immune cells to define which cells would only give rise to T and B lymphocytes. This revealed a new stage in lymphocyte development, information which could enrich future studies of the immune system. The discovery has also led to new research opportunities, with WEHI establishing of one of Australia’s first dedicated and integrated single cell research platforms in 2018, which is now being used to solve other research questions.
The research, which was published in Nature Immunology today, was led by Dr Shalin Naik, Dr Daniela Zalcenstein, Mr Luyi Tian, Mr Jaring Schreuder and Ms Sara Tomei.
At a glance
- All immune cells develop from a common ancestral blood stem cell, but different types of immune cells develop via different immature precursor cells.
- Using single cell multi-omics, an approach that looks at multiple aspects of individual cells, our researchers have identified a new step in the development of T and B lymphocytes.
- The discovery adds more detail to our understanding of how these critical immune cells are formed, and has underpinned the application of single cell multi-omics technologies to a range of other research questions
Focussing on single cells
Our immune system comprises many different types of cells with different functions, but all immune cells are derived from a single type of cell, a blood stem cell. The development of different immune cell types occurs through a branching ‘family tree’ of immature cells. At earlier stages of immune cell development, individual cells can give rise to several different types of mature cell, but as development progresses, cells become more limited in which final mature cells they can produce.
T and B lymphocytes – which are critical for targeted, specific immune responses – are closely related immune cells, meaning they share many common steps in their development, said Dr Naik. “Decades of research have defined how T and B lymphocytes develop, and the ‘branch points’ in their family tree when the developing cells lose the capacity to develop into other immune cell types,” he said.
Dr Zalcenstein said that to gain new insights into questions such as how immune cells develop, the team established Australia’s first ‘single cell multi-omics’ platform, which is now available to all researchers within the Single Cell Open Research Endeavour (SCORE) established by Dr Naik and Dr Zalcenstein in collaboration with Dr Stephen Wilcox of WEHI’s Genomics Hub and Associate Professor Matthew Ritchie.
“Multi-omics technologies combine different biological data sets – such as genomics, transcriptomics and proteomics – to compare different samples in more detail than is possible by looking at one data set. We have applied this approach to study individual cells, in this case developing immune cells, to understand in more detail which cells can give rise to lymphocytes. This approach is called single cell multi-omics,” she said.
“Rather than looking at data combined from many cells in a sample, we focus in on individual cells to understand the differences that exist within a larger population. It’s like looking at a football team – you can average out the number of goals, tackles and kicks per player in a game, but if you look at individual player statistics, you may discover that one player scored lots of goals, while another player was responsible for most of the tackles,” she said.
A new lymphocyte progenitor
SCORE’s study of immune cell precursors revealed a previously unrecognised cell type that could give rise to T and B lymphocytes, but not other immune cells.
“This cell occurred much earlier in lymphocyte development than we had suspected,” Dr Naik said. “Previous techniques had grouped different immune progenitors together, but by studying individual cells we were able to identify one cell type that was committed to developing into T and B lymphocytes.”
The discovery adds a new layer to the family tree of T and B lymphocytes and could provide a boost to other areas of research.
“Understanding in more detail how T and B lymphocytes develop could lead to better approaches to regenerate these cells as a treatment for certain diseases,” Dr Naik said. “We also know that many types of leukaemia arise from defects in early stages of immune cell development, so we are curious to know whether this progenitor cell has links to any forms of leukaemia.”
Dr Zalcenstein said the research was an excellent example of the power of single cell multi-omics. “Lymphocyte development has been studied in great depth for at least four decades. Even so, by applying this new approach we were able to learn more about it. This was one of the first projects tackled by SCORE, and since then we have applied the same approaches to more than 100 different research questions. It’s a really exciting new field to be part of,” she said.
The research was supported by the Australian National Health and Medical Research Council, the Australian Research Council, Stem Cells Australia the Australian Cancer Research Foundation, CSL and the Victorian Government.
WEHI Authors: Dr Daniela Zalcenstein, Mr Luyi Tian, Mr Jaring Schreuder, Ms Sara Tomei, Ms Dawn Lin, Dr Kirsten Fairfax, Dr Jessica Bolden, Dr Mark D. McKenzie, Dr Andrew Jarratt, Ms Adrienne Hilton, Mr Jacob Jackson, Ms Ladina Di Rago, Dr Carolyn de Graaf, Ms Olivia Stonehouse, Dr Samir Taoudi, Professor Warren Alexander, Professor Stephen Nutt, Dr Matthew Ritchie, Dr Ashley Ng, Dr Shalin Naik
Read article at Nature Immunology (subscription required for full text)
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