title: First Japanese case of Pierson syndrome with mutations in LAMB2.
abstract: Pierson syndrome (OMIM 609049) is typically characterized by congenital nephritic syndrome and peculiar ocular anomalies with microcoria. It is caused by mutations in LAMB2, which encodes laminin β2. Approximately 50 mutations of LAMB2 from approximately 40 unrelated families have been identified; however, most of them were from Western countries. Although three patients in Asia with mutations of LAMB2 have been reported, they were not typical cases. We report the first Japanese case of Pierson syndrome with proven causative LAMB2 mutations. She presented with congenital nephrotic syndrome and bilateral microcoria at birth, and developed end-stage renal disease at 2 months of age. This is the first report of a typical case from Asia. LAMB2 analysis by direct sequencing revealed the compound heterozygous mutations c.3974_3975insA (p.N1325KfsX1331, maternal, novel) in exon 25 and c.4519C>T (p.Q1507X, paternal) in exon 27. The phenotype due to LAMB2 mutations appears to be similar between different ethnic groups.
authors.affiliation: Department of Pediatrics, Wakayama Medical University, Wakayama, Japan.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Togawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Nakanishi
authors.forename: Hironobu
authors.initials: H
authors.lastname: Mukaiyama
authors.forename: Taketsugu
authors.initials: T
authors.lastname: Hama
authors.forename: Yuko
authors.initials: Y
authors.lastname: Shima
authors.forename: Masaru
authors.initials: M
authors.lastname: Nakano
authors.forename: Naoya
authors.initials: N
authors.lastname: Fujita
authors.forename: Kazumoto
authors.initials: K
authors.lastname: Iijima
authors.forename: Norishige
authors.initials: N
authors.lastname: Yoshikawa
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics* / Q000378:metabolism; D004247:DNA / Q000235:genetics*; D004252:DNA Mutational Analysis; D005124:Eye Abnormalities / Q000235:genetics* / Q000378:metabolism; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007564:Japan; D007797:Laminin / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D020294:Myasthenic Syndromes, Congenital; D009404:Nephrotic Syndrome / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D011681:Pupil Disorders / Q000235:genetics* / Q000378:metabolism
chemical_list: D007797:Laminin; C058783:laminin beta2; D004247:DNA