title: Mouse Fkbp8 activity is required to inhibit cell death and establish dorso-ventral patterning in the posterior neural tube.
abstract: Neural tube defects (NTDs) are birth defects that can be disabling or lethal and are second in their prevalence after cardiac defects among major human congenital malformations. Spina bifida is a NTD where the spinal cord is dysplastic, and the overlying spinal column is absent. At present, the molecular mechanisms underlying the spinal bifida development are largely unknown. In this study, we present a Fkbp8 mouse mutant that has an isolated and completely penetrant spina bifida, which is folate- and inositol-resistant. Fkbp8 mutants are not embryo lethal, but they display striking features of human spina bifida, including a dysplastic spinal cord, open neural canal and disability. The loss of Fkbp8 leads to increased apoptosis in the posterior neural tube, demonstrating that in vivo FKBP8 inhibits cell death. Gene expression analysis of Fkbp8 mutants revealed a perturbation of expression of neural tube patterning genes, suggesting that endogenous FKBP8 activity establishes dorso-ventral patterning of the neural tube. These studies demonstrate that Fkbp8 is not important for embryo survival, but is essential for spinal neural tube patterning, and to block apoptosis, in the developing neural tube. The mutant Fkbp8 allele is a new experimental model which will be useful in dissecting the pathogenesis of spinal NTDs, and enhance our understanding of the etiology of human NTDs.
authors.affiliation: Center for Environmental and Genetic Medicine, Institute of Biosciences and Technology, The Texas A&M University System Health Science Center, 2121 W. Holcombe Blvd, Houston, TX 77030, USA. lwong@ibt.tamhsc.edu
authors.forename: Rebecca Lee Yean
authors.initials: RL
authors.lastname: Wong
authors.forename: Bogdan J
authors.initials: BJ
authors.lastname: Wlodarczyk
authors.forename: Kyung Soo
authors.initials: KS
authors.lastname: Min
authors.forename: Melissa L
authors.initials: ML
authors.lastname: Scott
authors.forename: Susan
authors.initials: S
authors.lastname: Kartiko
authors.forename: Wei
authors.initials: W
authors.lastname: Yu
authors.forename: Michelle Y
authors.initials: MY
authors.lastname: Merriweather
authors.forename: Peter
authors.initials: P
authors.lastname: Vogel
authors.forename: Brian P
authors.initials: BP
authors.lastname: Zambrowicz
authors.forename: Richard H
authors.initials: RH
authors.lastname: Finnell
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000235:genetics / Q000502:physiology*; D019521:Body Patterning / Q000235:genetics / Q000502:physiology*; D004195:Disease Models, Animal; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D008817:Mice, Mutant Strains; D054259:Neural Tube / Q000196:embryology*; D009436:Neural Tube Defects / Q000196:embryology / Q000209:etiology / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D010641:Phenotype; D011247:Pregnancy; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016135:Spinal Dysraphism / Q000196:embryology / Q000209:etiology / Q000235:genetics; D022021:Tacrolimus Binding Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*
chemical_list: C119437:Fkbp8 protein, mouse; D012333:RNA, Messenger; D022021:Tacrolimus Binding Proteins