{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T16:34:28Z","timestamp":1790354068688,"version":"4.1.0"},"reference-count":68,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2021,11,17]],"date-time":"2021-11-17T00:00:00Z","timestamp":1637107200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100003011","name":"Immune Deficiency Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100003011","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Immunol."],"abstract":"<jats:p>Hemophagocytic lymphohistiocytosis (HLH) is a hyperinflammatory disorder characterized by the inability to properly terminate an immune response. Familial HLH (FHLH) and related immune dysregulation syndromes are associated with mutations in the genes <jats:italic>PRF1, UNC13D, STX11, STXBP2, LYST, AP3B1<\/jats:italic>, and <jats:italic>RAB27A<\/jats:italic>, all of which are required for the assembly, exocytosis, and function of cytotoxic granules within CD8+ T cells and natural killer (NK) cells. Loss-of-function mutations in these genes render the cytotoxicity pathway ineffective, thereby failing to eradicate immune stimuli, such as infectious pathogens or malignant cells. The resulting persistent immune system stimulation drives hypercytokinemia, ultimately leading to severe tissue inflammation and end-organ damage. Traditionally, a diagnosis of FHLH requires the identification of biallelic loss-of-function mutations in one of these degranulation pathway genes. However, this narrow definition fails to encompass patients with other genetic mechanisms underlying degranulation pathway dysfunction. In particular, mounting clinical evidence supports a potential digenic mode of inheritance of FHLH in which single loss-of-function mutations in two different degranulation pathway genes cooperate to impair pathway activity. Here, we review the functions of the FHLH-associated genes within the degranulation pathway and summarize clinical evidence supporting a model in which cumulative defects along this mechanistic pathway may underlie HLH.<\/jats:p>","DOI":"10.3389\/fimmu.2021.777851","type":"journal-article","created":{"date-parts":[[2021,11,17]],"date-time":"2021-11-17T04:46:51Z","timestamp":1637124411000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":30,"title":["Digenic Inheritance: Evidence and Gaps in Hemophagocytic Lymphohistiocytosis"],"prefix":"10.3389","volume":"12","author":[{"given":"Erica A.","family":"Steen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle L.","family":"Hermiston","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kim E.","family":"Nichols","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren K.","family":"Meyer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,11,17]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","DOI":"10.1182\/blood.2019000936","article-title":"Pediatric Hemophagocytic Lymphohistiocytosis","volume":"135","author":"Canna","year":"2020","journal-title":"Blood"},{"key":"B2","doi-asserted-by":"publisher","DOI":"10.1002\/pbc.21039","article-title":"HLH-2004: Diagnostic and Therapeutic Guidelines for Hemophagocytic Lymphohistiocytosis","volume":"48","author":"Henter","year":"2007","journal-title":"Pediatr Blood Cancer"},{"key":"B3","doi-asserted-by":"publisher","DOI":"10.1016\/s0889-8588(05)70520-7","article-title":"Familial Hemophagocytic Lymphohistiocytosis. 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