{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T14:23:46Z","timestamp":1792592626452,"version":"4.5.0"},"reference-count":101,"publisher":"Georg Thieme Verlag KG","issue":"02","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Semin Thromb Hemost"],"published-print":{"date-parts":[[2025,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Vitamin K\u2013dependent coagulation factors deficiency (VKCFD) is a rare autosomal recessive genetic disease characterized by impaired levels of multiple coagulation factors (II, VII, IX, and X) and natural anticoagulants (proteins C and S). VKCFD is part of familial multiple coagulation factor deficiencies, reporting overall 50 affected families thus far. Disease manifestations are quite heterogeneous, bleeding symptoms may vary, and even, although generally mild, some patients may succumb to fatal outcomes. VKCFD diagnosis may be delayed because the disease phenotype simulates the most frequently acquired deficiencies of vitamin K. First-line coagulation assays, prothrombin time\/international normalized ratio (PT\/INR) and activated partial thromboplastin time (aPTT), are both prolonged; mixing test typically normalizes the clotting times; and vitamin K\u2013dependent coagulation factors will be variably decreased. Molecularly, VKCFD is associated with mutations in \u03b3-glutamyl-carboxylase (GGCX) or vitamin K epoxide reductase complex subunit 1 (VKORC1) genes. Vitamin K is involved not only in the biosynthesis of coagulation proteins but also in bone metabolism and cell proliferation. Therapeutic options are based on vitamin K supplementation, coagulation factors (prothrombin complex), and fresh frozen plasma, in case of severe bleeding episodes. Two case studies here illustrate the diagnostic challenges of VKCFD: case 1 depicts a woman with a history of bleeding episodes, diagnosed, only in her third decade of life with inherited homozygous GGCX gene mutation. Case 2 shows a man with an acquired vitamin K deficiency caused by Crohn's disease. Better understanding of GGCX and VKORC1 mutations aids in prognosis and treatment planning, with emerging insights suggesting potential limitations in the effectiveness of vitamin K supplementation in certain mutations.<\/jats:p>","DOI":"10.1055\/s-0044-1792031","type":"journal-article","created":{"date-parts":[[2024,11,4]],"date-time":"2024-11-04T19:40:32Z","timestamp":1730749232000},"page":"170-179","source":"Crossref","is-referenced-by-count":12,"title":["Clinical, Laboratory, and Molecular Characteristics of Inherited Vitamin K\u2013Dependent Coagulation Factors Deficiency"],"prefix":"10.1055","volume":"51","author":[{"given":"Salvatore","family":"Perrone","sequence":"additional","affiliation":[{"name":"Department of Hematology, S. M. Goretti Hospital, Polo Universitario Pontino, Latina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simona","family":"Raso","sequence":"additional","affiliation":[{"name":"Department of Hematology and Rare Diseases, V Cervello Hospital, Azienda Ospedaliera Ospedali Riuniti Villa Sofia-Cervello, Palermo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8934-2936","authenticated-orcid":false,"given":"Mariasanta","family":"Napolitano","sequence":"additional","affiliation":[{"name":"Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"194","published-online":{"date-parts":[[2024,11,4]]},"reference":[{"issue":"21","key":"ref1","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1186\/1750-1172-5-21","article-title":"Hereditary combined deficiency of the 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