title: Novel frem1-related mouse phenotypes and evidence of genetic interactions with gata4 and slit3.
abstract: The FRAS1-related extracellular matrix 1 (FREM1) gene encodes an extracellular matrix protein that plays a critical role in the development of multiple organ systems. In humans, recessive mutations in FREM1 cause eye defects, congenital diaphragmatic hernia, renal anomalies and anorectal malformations including anteriorly placed anus. A similar constellation of findings-microphthalmia, cryptophthalmos, congenital diaphragmatic hernia, renal agenesis and rectal prolapse-have been described in FREM1-deficient mice. In this paper, we identify a homozygous Frem1 missense mutation (c.1687A>T, p.Ile563Phe) in an N-ethyl-N-nitrosourea (ENU)-derived mouse strain, crf11, with microphthalmia, cryptophthalmos, renal agenesis and rectal prolapse. This mutation affects a highly conserved residue in FREM1's third CSPG domain. The p.Ile563Phe change is predicted to be deleterious and to cause decreased FREM1 protein stability. The crf11 allele also fails to complement the previously described eyes2 allele of Frem1 (p.Lys826*) providing further evidence that the crf11 phenotype is due to changes affecting Frem1 function. We then use mice bearing the crf11 and eyes2 alleles to identify lung lobulation defects and decreased anogenital distance in males as novel phenotypes associated with FREM1 deficiency in mice. Due to phenotypic overlaps between FREM1-deficient mice and mice that are deficient for the retinoic acid-responsive transcription factor GATA4 and the extracellular matrix protein SLIT3, we also perform experiments to look for in vivo genetic interactions between the genes that encode these proteins. These experiments reveal that Frem1 interacts genetically with Gata4 in the development of lung lobulation defects and with Slit3 in the development of renal agenesis. These results demonstrate that FREM1-deficient mice faithfully recapitulate many of the phenotypes seen in individuals with FREM1 deficiency and that variations in GATA4 and SLIT3 expression modulate some FREM1-related phenotypes in mice.
authors.affiliation: Departments of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America.
authors.forename: Tyler F
authors.initials: TF
authors.lastname: Beck
authors.forename: Oleg A
authors.initials: OA
authors.lastname: Shchelochkov
authors.forename: Zhiyin
authors.initials: Z
authors.lastname: Yu
authors.forename: Bum Jun
authors.initials: BJ
authors.lastname: Kim
authors.forename: Andrés
authors.initials: A
authors.lastname: Hernández-García
authors.forename: Hitisha P
authors.initials: HP
authors.lastname: Zaveri
authors.forename: Colin
authors.initials: C
authors.lastname: Bishop
authors.forename: Paul A
authors.initials: PA
authors.lastname: Overbeek
authors.forename: David W
authors.initials: DW
authors.lastname: Stockton
authors.forename: Monica J
authors.initials: MJ
authors.lastname: Justice
authors.forename: Daryl A
authors.initials: DA
authors.lastname: Scott
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics; D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D000013:Congenital Abnormalities / Q000235:genetics; D004843:Epistasis, Genetic; D016326:Extracellular Matrix Proteins / Q000737:chemistry / Q000172:deficiency / Q000235:genetics* / Q000378:metabolism; D050991:GATA4 Transcription Factor / Q000235:genetics* / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D056726:Genetic Association Studies; D057895:Haploinsufficiency; D006720:Homozygote; D007668:Kidney / Q000002:abnormalities; D007674:Kidney Diseases / Q000151:congenital / Q000235:genetics; D008168:Lung / Q000196:embryology / Q000378:metabolism / Q000473:pathology; D008297:Male; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D020125:Mutation, Missense; D010641:Phenotype; D016415:Sequence Alignment
chemical_list: D016326:Extracellular Matrix Proteins; C482018:Fras1 protein, mouse; C492585:Frem1 protein, mouse; C504802:Frem2 protein, mouse; D050991:GATA4 Transcription Factor; D008565:Membrane Proteins; C432251:Slit3 protein, mouse
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