Natural killers or ILC1s? That is the question.

Area of Science:

• Immunology
• Cell Biology

Background:

• Group 1 innate lymphoid cells (ILCs) encompass natural killer (NK) cells and ILC1s, which coexist in peripheral tissues.
• The precise molecular identity and developmental relationship between ILC1s and NK cells remain incompletely understood.
• ILC1s exhibit significant heterogeneity, complicating their classification and relationship with NK cells.

Purpose of the Study:

• To discuss the criteria for distinguishing ILC1s and NK cells as distinct lineages.
• To explore the implications of their shared features and distinct transcriptional requirements.
• To highlight the challenges in differentiating these cell types for functional studies.

Main Methods:

• Comparative analysis of origin, location, phenotype, and transcriptional regulation.
• Review of existing literature on ILC1 and NK cell characteristics.
• Discussion of the complexities arising from ILC1 subset heterogeneity.

Main Results:

• ILC1s and NK cells share common features, blurring clear lineage distinctions.
• Heterogeneity within ILC1 subsets presents distinct transcriptional requirements.
• The relationship between ILC1s and NK cells is complex and requires further investigation.

Conclusions:

• Discriminating between NK cells and ILC1s is a significant challenge in immunology.
• Understanding these distinctions is vital for elucidating their individual roles in infection and tumor immunosurveillance.
• Further research is needed to clarify the distinct lineages and functions within Group 1 ILCs.