Heather Desh1, S Lauren Gray2, Michael J Horton2, Gwenael Raoul3, Anthea M Rowlerson4, Joel Ferri3, Alexandre R Vieira5, James J Sciote6. 1. Orthodontic Private Practice,1649 Bluebird Canyon Drive, Laguna Beach, CA, United States. 2. Orthodontic Department, Temple University, 3223 North Broad Street, Philadelphia, PA, United States. 3. Oral and Maxillofacial Surgery, Université Lille Nord de France, UDSL, Roger Salengro Hospital, CHU, and INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, Lille, France. 4. Centre of Human and Aerospace Physiological Sciences, King's College London, London, UK. 5. Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, 3501 Terrace Street, Pittsburgh, PA, United States. 6. Orthodontic Department, Temple University, 3223 North Broad Street, Philadelphia, PA, United States. Electronic address: jjs6@dental.temple.edu.
Abstract
OBJECTIVE: Type I myosins are molecular motors necessary for glucose transport in the cytoplasm and initiation of transcription in the nucleus. Two of these, MYO1H and MYO1C, are paralogs which may be important in the development of malocclusion. The objective of this study was to investigate their gene expression in the masseter muscle of malocclusion subjects. Two functionally related proteins known to contribute to malocclusion were also investigated: KAT6B (a chromatin remodelling epigenetic enzyme which is activated by MYO1C) and RUNX2 (a transcription factor regulating osteogenesis which is activated by KAT6B). DESIGN: Masseter muscle samples and malocclusion classifications were obtained from orthognathic surgery subjects. Muscle was sectioned and immunostained to determine fibre type properties. RNA was isolated from the remaining sample to determine expression levels for the four genes by TaqMan(®) RT-PCR. Fibre type properties, gene expression quantities and malocclusion classification were compared. RESULTS: There were very significant associations (P<0.0000001) between MYO1C and KAT6B expressions. There were also significant associations (P<0.005) between RUNX2 expression and masseter muscle type II fibre properties. Very few significant associations were identified between MYO1C and masseter muscle fibre type properties. CONCLUSIONS: The relationship between MYO1C and KAT6B suggests that the two are interacting in chromatin remodelling for gene expression. This is the nuclear myosin1 (NM1) function of MYO1C. A surprising finding is the relationship between RUNX2 and type II masseter muscle fibres, since RUNX2 expression in mature muscle was previously unknown. Further investigations are necessary to elucidate the role of RUNX2 in adult masseter muscle.
OBJECTIVE:Type I myosins are molecular motors necessary for glucose transport in the cytoplasm and initiation of transcription in the nucleus. Two of these, MYO1H and MYO1C, are paralogs which may be important in the development of malocclusion. The objective of this study was to investigate their gene expression in the masseter muscle of malocclusion subjects. Two functionally related proteins known to contribute to malocclusion were also investigated: KAT6B (a chromatin remodelling epigenetic enzyme which is activated by MYO1C) and RUNX2 (a transcription factor regulating osteogenesis which is activated by KAT6B). DESIGN: Masseter muscle samples and malocclusion classifications were obtained from orthognathic surgery subjects. Muscle was sectioned and immunostained to determine fibre type properties. RNA was isolated from the remaining sample to determine expression levels for the four genes by TaqMan(®) RT-PCR. Fibre type properties, gene expression quantities and malocclusion classification were compared. RESULTS: There were very significant associations (P<0.0000001) between MYO1C and KAT6B expressions. There were also significant associations (P<0.005) between RUNX2 expression and masseter muscle type II fibre properties. Very few significant associations were identified between MYO1C and masseter muscle fibre type properties. CONCLUSIONS: The relationship between MYO1C and KAT6B suggests that the two are interacting in chromatin remodelling for gene expression. This is the nuclear myosin1 (NM1) function of MYO1C. A surprising finding is the relationship between RUNX2 and type II masseter muscle fibres, since RUNX2 expression in mature muscle was previously unknown. Further investigations are necessary to elucidate the role of RUNX2 in adult masseter muscle.
Authors: A A El-Gheriani; B S Maher; A S El-Gheriani; J J Sciote; F A Abu-Shahba; R Al-Azemi; M L Marazita Journal: J Dent Res Date: 2003-07 Impact factor: 6.116
Authors: Tomáš Venit; Rastislav Dzijak; Alžběta Kalendová; Michal Kahle; Jana Rohožková; Volker Schmidt; Thomas Rülicke; Birgit Rathkolb; Wolfgang Hans; Alexander Bohla; Oliver Eickelberg; Tobias Stoeger; Eckhard Wolf; Ali Önder Yildirim; Valérie Gailus-Durner; Helmut Fuchs; Martin Hrabě de Angelis; Pavel Hozák Journal: PLoS One Date: 2013-04-11 Impact factor: 3.240