Erschienen in:
01.08.2014 | Original Article
Novel compound heterozygous PIGT mutations caused multiple congenital anomalies-hypotonia-seizures syndrome 3
verfasst von:
Mitsuko Nakashima, Hirofumi Kashii, Yoshiko Murakami, Mitsuhiro Kato, Yoshinori Tsurusaki, Noriko Miyake, Masaya Kubota, Taroh Kinoshita, Hirotomo Saitsu, Naomichi Matsumoto
Erschienen in:
Neurogenetics
|
Ausgabe 3/2014
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Abstract
Recessive mutations in genes of the glycosylphosphatidylinositol (GPI)-anchor synthesis pathway have been demonstrated as causative of GPI deficiency disorders associated with intellectual disability, seizures, and diverse congenital anomalies. We performed whole exome sequencing in a patient with progressive encephalopathies and multiple dysmorphism with hypophosphatasia and identified novel compound heterozygous mutations, c.250G>T (p. Glu84*) and c.1342C>T (p. Arg488Trp), in PIGT encoding a subunit of the GPI transamidase complex. The surface expression of GPI-anchored proteins (GPI-APs) on patient granulocytes was lower than that of healthy controls. Transfection of the Arg488Trp mutant PIGT construct, but not the Glu84* mutant, into PIGT-deficient cells partially restored the expression of GPI-APs DAF and CD59. These results indicate that PIGT mutations caused neurological impairment and multiple congenital anomalies in this patient.