HLF-Gene Controls Generation of Immune System

Interference with its normal downregulation revealed Hlf as a strong negative regulator of lymphoid development, while remaining compatible with myeloid fates.

They also observed rapid lymphoid commitment upon reduced Hlf activity. The arising phenotypes resulted from Hlf binding to active enhancers of myeloid-competent cells, transcriptional induction of myeloid, and ablation of lymphoid gene programs, with Hlf induction of nuclear factor I C (Nfic) as a functionally relevant target gene. Patients with leukemia in which the HLF gene is involved have a very poor prognosis, but it has been difficult to generate reliable models for studying the emergence, development and possible treatment of these leukemias more thoroughly.

David Bryder, PhD, a professor and lead investigator of the study, said, “Our studies revealed that if the immature blood cells are unable to shut down the HLF gene at the correct stage of development, the lymphocytes, the long-lived immune cells, are unable to form. As a result, you will only have one type of immune defense. An increased understanding of these processes is crucial as immune cells in patients who undergo bone marrow transplants are regenerated very slowly, which results in a long period of immune sensitivity.” The study was published on November 21, 2017, in the journal Cell Reports.

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