title: Fused pulmonary lobes is a rat model of human Fraser syndrome.
abstract: Fused pulmonary lobes (fpl) is a mutant gene that is inherited in an autosomal recessive manner and causes various developmental defects, including fusion of pulmonary lobes, and eyelid and digit anomalies in rats. Since these developmental defects closely resemble those observed in patients with Fraser syndrome, a recessive multiorgan disorder, and its model animals, we investigated whether the abnormal phenotypes observed in fpl/fpl mutant rats are attributable to a genetic disorder similar to Fraser syndrome. At the epidermal basement membrane in fpl/fpl mutant neonates, the expression of QBRICK, a basement membrane protein whose expression is attenuated in Fraser syndrome model mice, was greatly diminished compared with control littermates. Quantitative RT-PCR analyses of Fraser syndrome-related genes revealed that Frem2 transcripts were markedly diminished in QBRICK-negative embryos. Genomic DNA sequencing of the fpl/fpl mutant identified a nonsense mutation that introduced a stop codon at serine 2005 in Frem2. These findings indicate that the fpl mutant is a rat model of human Fraser syndrome.
authors.affiliation: Laboratory of Extracellular Matrix Biochemistry, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Daiji
authors.initials: D
authors.lastname: Kiyozumi
authors.forename: Itsuko
authors.initials: I
authors.lastname: Nakano
authors.forename: Ken L
authors.initials: KL
authors.lastname: Takahashi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Hojo
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Aoyama
authors.forename: Kiyotoshi
authors.initials: K
authors.lastname: Sekiguchi
mesh_terms: D000818:Animals; D018389:Codon, Nonsense; D004195:Disease Models, Animal; D005260:Female; D058497:Fraser Syndrome / Q000235:genetics*; D006801:Humans; D008297:Male; D051381:Rats; D014158:Transcription, Genetic
chemical_list: D018389:Codon, Nonsense