Abstract:
:Attachment to the plasma membrane by linkage to a glycosylphosphatidylinositol (GPI) anchor is a mode of protein expression highly conserved from protozoa to mammals. As a clinical entity, deficiency of GPI has been recognized as paroxysmal nocturnal hemoglobinuria, an acquired clonal disorder associated with somatic mutations of the X-linked PIGA gene in hematopoietic cells. We have identified a novel disease characterized by a propensity to venous thrombosis and seizures in which deficiency of GPI is inherited in an autosomal recessive manner. In two unrelated kindreds, a point mutation (c --> g) at position -270 from the start codon of PIGM, a mannosyltransferase-encoding gene, disrupts binding of the transcription factor Sp1 to its cognate promoter motif. This mutation substantially reduces transcription of PIGM and blocks mannosylation of GPI, leading to partial but severe deficiency of GPI. These findings indicate that biosynthesis of GPI is essential to maintain homeostasis of blood coagulation and neurological function.
journal_name
Nat Medjournal_title
Nature medicineauthors
Almeida AM,Murakami Y,Layton DM,Hillmen P,Sellick GS,Maeda Y,Richards S,Patterson S,Kotsianidis I,Mollica L,Crawford DH,Baker A,Ferguson M,Roberts I,Houlston R,Kinoshita T,Karadimitris Adoi
10.1038/nm1410subject
Has Abstractpub_date
2006-07-01 00:00:00pages
846-51issue
7eissn
1078-8956issn
1546-170Xpii
nm1410journal_volume
12pub_type
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