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ARPC1B deficiency leads to impaired actin filament branching, affecting cytoskeletal processes in leukocytes, including migration, adhesion, endocytosis, and phagocytosis. This report presents two index cases from different families, who despite sharing an identical germline homozygous\n                    <jats:italic>ARPC1B<\/jats:italic>\n                    splice-site variant, ARPC1B\n                    <jats:sup>c.64+2T&gt; A<\/jats:sup>\n                    , had distinct clinical phenotypes including age of onset of symptoms and clinical manifestations. In addition, differences were observed in their immunological profiles including neutrophil chemotaxis, upregulation of complement receptor expression as well as B cell maturation and responses to EBV transformation. Further molecular investigation suggests the downstream cryptic splice-site activated by the mutation permits \u2018leaky splicing\u2019, enabling trace expression of wildtype ARPC1B. This supports a less severe deficiency in ARPC1B activity, rendering a less severe phenotype in one case compared with the other due to differential transcriptional activity of wildtype ARPC1B.\n                  <\/jats:p>","DOI":"10.1007\/s10875-026-02002-4","type":"journal-article","created":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T14:54:47Z","timestamp":1772895287000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Characterisation of a Leaky Splice-Site Mutation Associated with Phenotypic Diversity in Two Unrelated Patients with ARPC1B Deficiency"],"prefix":"10.1007","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1912-7581","authenticated-orcid":false,"given":"Alex","family":"Quach","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6783-4830","authenticated-orcid":false,"given":"Jovanka","family":"King","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1617-0381","authenticated-orcid":false,"given":"Trishni","family":"Putty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Gold","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Quinn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2581-6407","authenticated-orcid":false,"given":"Antonio","family":"Ferrante","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,7]]},"reference":[{"key":"2002_CR1","doi-asserted-by":"publisher","first-page":"14816","DOI":"10.1038\/ncomms14816","volume":"8","author":"WH Kahr","year":"2017","unstructured":"Kahr WH, Pluthero FG, Elkadri A, Warner N, Drobac M, Chen CH, et al. 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