title: Growth retardation and skin abnormalities of the Recql4-deficient mouse.
abstract: Mutations in the Recql4 gene are very likely responsible for a subset of Rothmund-Thomson syndrome (RTS) cases, but until now there has been no animal model to confirm this. Knockout mice in which the Recql4 gene is disrupted at exons 5-8 exhibit embryonic lethality at embryonic day 3.5-6.5. We generated a helicase activity-inhibited mouse by deleting exon 13 of Recql4, which is one of the coding exons of the consensus RecQ-helicase domain. This domain is the primary site of mutations that have been identified in RTS patients. The exon 13-deleted Recql4-deficient mice are viable, but exhibit severe growth retardation and abnormalities in several tissues, and embryonic fibroblasts show a defect in cell proliferation. Abnormalities in the Recql4-deficient mice are similar to those in RTS patients, suggesting that defects in the Recql4 gene may indeed be responsible for RTS. We speculate that the loss of Recql4 helicase activity results in the prematurely aged appearance observed in some RecQ helicase diseases.
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Hoki
authors.forename: Ryoko
authors.initials: R
authors.lastname: Araki
authors.forename: Akira
authors.initials: A
authors.lastname: Fujimori
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ohhata
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Koseki
authors.forename: Ryutaro
authors.initials: R
authors.lastname: Fukumura
authors.forename: Miki
authors.initials: M
authors.lastname: Nakamura
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Noda
authors.forename: Seiji
authors.initials: S
authors.lastname: Kito
authors.forename: Masumi
authors.initials: M
authors.lastname: Abe
mesh_terms: D000251:Adenosine Triphosphatases / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight / Q000235:genetics*; D002478:Cells, Cultured; D004265:DNA Helicases / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism; D004622:Embryo, Mammalian; D005347:Fibroblasts / Q000378:metabolism*; D018390:Gene Targeting; D018095:Germ-Line Mutation; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D011839:Radiation, Ionizing; D053484:RecQ Helicases; D011038:Rothmund-Thomson Syndrome; D012868:Skin Abnormalities / Q000235:genetics* / Q000473:pathology; D013997:Time Factors; D014466:Ultraviolet Rays; D014965:X-Rays
chemical_list: D000251:Adenosine Triphosphatases; C506731:RECQL4 protein, human; D004265:DNA Helicases; D053484:RecQ Helicases