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Dental genetics

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https://www.readbyqxmd.com/read/27922732/dental-caries-and-associated-factors-in-twins-with-down-syndrome-a-case-report
#1
Maurício José Santos Moreira, Carolina Schwertner, Ana Paula Dall'Onder, Natália Mincato Klaus, Clarissa Cavalcanti Fatturi Parolo, Lina Naomi Hashizume
Down syndrome (DS) is the most common genetic disorder in humans, but its incidence in monozygotic twins is extremely rare. The aim of this study was to determine the factors associated with dental caries in a pair of monozygotic twin girls with DS, where one had caries experience and the other did not. Clinical examination, salivary Streptococcus mutans (S. mutans) levels and their genotypic diversity, the biochemical composition of the dental biofilm, the frequency of sucrose consumption, and toothbrushing habits were assessed from the twin girls...
December 6, 2016: Special Care in Dentistry
https://www.readbyqxmd.com/read/27919444/mechanistic-genomic-and-proteomic-study-on-the-effects-of-bisgma-derived-biodegradation-product-on-cariogenic-bacteria
#2
Lida Sadeghinejad, Dennis G Cvitkovitch, Walter L Siqueira, Justin Merritt, J Paul Santerre, Yoav Finer
OBJECTIVES: Investigate the effects of a Bis-phenyl-glycidyl-dimethacrylate (BisGMA) biodegradation product, bishydroxypropoxyphenyl-propane (BisHPPP), on gene expression and protein synthesis of cariogenic bacteria. METHODS: Quantitative real-time polymerase chain reaction was used to investigate the effects of BisHPPP on the expression of specific virulence-associated genes, i.e. gtfB, gtfC, gbpB, comC, comD, comE and atpH in Streptococcus mutans UA159. Possible mechanisms for bacterial response to BisHPPP were explored using gene knock-out and associated complemented strains of the signal peptide encoding gene, comC...
December 2, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27899787/mcardle-disease-misdiagnosed-as-meningitis
#3
Renata Siciliani Scalco, Sherryl Chatfield, Muhammad Hyder Junejo, Suzanne Booth, Jatin Pattni, Richard Godfrey, Ros Quinlivan
BACKGROUND McArdle disease is a glycogen storage disorder mainly characterized by exercise intolerance. Prolonged muscle contracture is also a feature of this condition and may lead to rhabdomyolysis (RM), which is a serious event characterized by acute skeletal muscle damage.  CASE REPORT A 44-year-old female patient presented with an acute contracture of the posterior neck muscles, causing severe nuchal rigidity. The contracture was induced during a dental extraction as she held her mouth open for a prolonged period, with her neck in a rigid position...
November 30, 2016: American Journal of Case Reports
https://www.readbyqxmd.com/read/27899776/-new-classification-for-advanced-colorectal-cancer-using-cancerplex%C3%A2-genomic-tests
#4
Hitoshi Kameyama, Yoshifumi Shimada, Hiroshi Ichikawa, Masayuki Nagahashi, Jun Sakata, Takashi Kobayashi, Hitoshi Nogami, Satoshi Maruyama, Yasumasa Takii, Shujiro Okuda, Yiwei Ling, Hiroshi Izutsu, Keisuke Kodama, Mitsutaka Nakada, Toshifumi Wakai
Recently, targeted drugs have been developed for the treatment of colorectal cancer(CRC). Among targets, it is well known that KRAS mutations are associated with resistance to epidermal growth factor receptor(EGFR)monoclonal antibodies. However, response rates using anti-EGFR monotherapy for CRC were less than 20-30% in previous clinical studies. Thus, because the RAS/MAP2K/MAPK and PI3K/AKT pathways are associated with CRC resistance to chemotherapy, we analyzed gene mutations in Stage IV CRC patients using a genomic test(CancerPlex®)...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/27895972/genetic-basis-of-nonsyndromic-and-syndromic-tooth-agenesis
#5
REVIEW
Xiaoqian Ye, Ali B Attaie
Human dentition development is a long and complex process which involves a series of reciprocal and sequential interactions between the embryonic stomodeal epithelium and the underlying neural crest-derived mesenchyme. Despite environment disturbances, tooth development is predominantly genetically controlled. To date, more than 200 genes have been identified in tooth development. These genes implied in various signaling pathways such as the bone morphogenetic protein, fibroblast growth factor, sonic hedgehog homolog, ectodysplasin A, wingless-type MMTV integration site family (Wnt), and transform growth factor pathways...
December 2016: Journal of Pediatric Genetics
https://www.readbyqxmd.com/read/27894112/association-of-mbl2-gene-polymorphism-with-dental-caries-in-saudi-children
#6
Yousef M Alyousef, J Francis Borgio, Sayed AbdulAzeez, Naif Al-Masoud, Ali A Al-Ali, Emad Al-Shwaimi, Amein K Al-Ali
The high prevalence of dental caries in children worldwide is a major oral health problem which requires early intervention. Dental caries is mainly caused by the action of acids produced by bacteria in addition to many other factors. Recent genetic studies have reported that a number of genes are associated with the susceptibility to dental caries. The majority of these genes are associated with inflammation, increased susceptibility to infection, and dentine matrix formation. Using the TaqMan assay and direct DNA sequencing, the prevalence of 6 single-nucleotide polymorphisms (SNPs) in MMP9, MBL2, MMP2, and TIMP2 genes was determined in 102 children with caries and in 100 age-matched caries-free controls...
November 29, 2016: Caries Research
https://www.readbyqxmd.com/read/27890318/the-mandibular-molar-pit-tubercle-mmpt-dental-nonmetric-trait-comprehensive-analysis-of-a-large-sample
#7
Luís Miguel Marado, Ana Maria Silva
Dental nonmetric traits are quasicontinous variables, mostly of genetic origin. Thus, sets of such traits allow biological distance estimation between samples. Mandibular molar pit-tubercle (MMPT) is a buccal trait defined by Weets (2009) in Irish samples. This study aims to analyze (a) trait frequencies, (b) grade definitions, (c) intraobserver error, (d) sexual dimorphism, (e) asymmetry, and (f) trait associations for MMPT in a Portuguese sample. The first (LM1), second (LM2) and third (LM3) lower molars of 600 identified individuals from the Coimbra collections were scored for MMPT in three scoring sessions...
September 20, 2016: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/27886669/revising-the-american-dental-association-principles-of-ethics-and-code-of-professional-conduct-adding-respect-for-human-dignity-as-the-sixth-principle-of-dental-ethics-to-accommodate-advances-in-genetic-science
#8
EDITORIAL
https://www.readbyqxmd.com/read/27872325/the-molecular-circuit-regulating-tooth-development-in-crocodilians
#9
S Tsai, A Abdelhamid, M K Khan, A Elkarargy, R B Widelitz, C M Chuong, P Wu
Alligators have robust regenerative potential for tooth renewal. In contrast, extant mammals can either renew their teeth once (diphyodont dentition, as found in humans) or not at all (monophyodont dentition, present in mice). Previously, the authors used multiple mitotic labeling to map putative stem cells in alligator dental laminae, which contain quiescent odontogenic progenitors. The authors demonstrated that alligator tooth cycle initiation is related to β-catenin/Wnt pathway activity in the dental lamina bulge...
December 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27871711/comparisons-of-tooth-sizes-dental-arch-dimensions-tooth-wear-and-dental-crowding-in-amazonian-indigenous-people
#10
David Normando, Hellen Gabriela de Almeida Santos, Cátia Cardoso Abdo Quintão
INRODUCTION: Our objective was to assess tooth wear, arch dimensions, tooth sizes, and dental crowding in 4 remote indigenous villages on the Xingu River in Brazil. These populations have similar patterns of dietary habits and practice exclusive breast-feeding, whereas studies in human genetics show large intertribal genetic distances and low intratribal variations. METHODS: Dental casts of 107 subjects in the permanent dentition were evaluated. Tooth wear, arch dimensions, mesiodistal tooth widths, and the irregularity index of the incisors were obtained and compared using analysis of variance or the Kruskal-Wallis test (P <0...
November 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27870215/detangling-the-evolutionary-developmental-integration-of-dentate-jaws-evidence-that-a-p63-gene-network-regulates-odontogenesis-exclusive-of-mandible-morphogenesis
#11
Muhammad T Raj, Julia C Boughner
Vertebrate jaws and dentitions fit and function together, yet the genetic processes that coordinate cranial and dental morphogenesis and evolution remain poorly understood. Teeth but not jaws fail to form in the edentate p63(-/-) mouse mutant, which we used here to identify genes important to odontogenesis, but not jaw morphogenesis, and that may allow dentitions to change during development and evolution without necessarily affecting the jaw skeleton. With the working hypothesis that tooth and jaw development are autonomously controlled by discreet gene regulatory networks, using gene expression microarray assays validated by quantitative reverse-transcription PCR we contrasted expression in mandibular prominences at embryonic days (E) 10-13 of mice with normal lower jaw development but either normal (p63(+/-) , p63(+/+) ) or arrested (p63(-/-) ) tooth development...
December 2016: Evolution & Development
https://www.readbyqxmd.com/read/27869143/genome-mining-unveils-widespread-natural-product-biosynthetic-capacity-in-human-oral-microbe-streptococcus-mutans
#12
Liwei Liu, Tingting Hao, Zhoujie Xie, Geoff P Horsman, Yihua Chen
Streptococcus mutans is a major pathogen causing human dental caries. As a Gram-positive bacterium with a small genome (about 2 Mb) it is considered a poor source of natural products. Due to a recent explosion in genomic data available for S. mutans strains, we were motivated to explore the natural product production potential of this organism. Bioinformatic characterization of 169 publically available genomes of S. mutans from human dental caries revealed a surprisingly rich source of natural product biosynthetic gene clusters...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27857902/severe-congenital-cyclic-neutropenia-a-case-report
#13
Vidyavathi H Patil, Shivayogi M Hugar, Girish Balikai, Sudha Patil
Congenital cyclic neutropenia syndrome is a constitutional genetic disorder which is characterized by very low number of neutrophils (neutropenia). Patients suffering from this disorder clinically present with neutropenia at early age, history of recurrent fever, ulcerations in the oral cavity, gingivitis, and other recurrent infections. This paper describes a case report of a child with recurrent mouth ulcers, fever, and later diagnosed with severe congenital cyclic neutropenia. This also emphasizes the importance of identification of rare causes of immunosuppressive conditions in children presenting with recurrent oral ulcers and poor dental hygiene, to prevent long-term complications of oral cavity and also morbidity and mortality secondary to neutropenic sepsis...
October 2016: International Journal of Applied and Basic Medical Research
https://www.readbyqxmd.com/read/27857102/is-there-an-association-between-dental-implants-and-squamous-cell-carcinoma
#14
A O Salgado-Peralvo, L Arriba-Fuente, M V Mateos-Moreno, A Salgado-García
Introduction The complications associated with dental implants are numerous, most of them of an inflammatory nature; nevertheless, some isolated cases of oral squamous cell carcinoma (OSCC) have been found in the vicinity of the implants. The objective of the present article is to know whether there is an association between dental implants and the development of OSCC.Method and materials A search was carried out in Medline, Tripdatabase and Cochrane with the keywords 'dental implants' AND 'squamous cell carcinoma', and 'dental implant complications' AND 'squamous cell carcinoma...
November 18, 2016: British Dental Journal
https://www.readbyqxmd.com/read/27857074/second-premolar-agenesis-is-associated-with-mandibular-form-a-geometric-morphometric-analysis-of-mandibular-cross-sections
#15
Michael H Bertl, Kristina Bertl, Manuel Wagner, André Gahleitner, Andreas Stavropoulos, Christian Ulm, Philipp Mitteroecker
The aim of this study was to compare mandibular form (i.e., size and shape) between patients with agenesis of the lower second premolar (P2) and a control group with no agenesis. Three hypotheses were tested: (H1) agenesis causes a change in mandibular morphology because of inadequate alveolar ridge development in the area of the missing tooth (mandibular plasticity); (H2) agenesis is caused by spatial limitations within the mandible (dental plasticity); and (H3) common genetic/epigenetic factors cause agenesis and affect mandibular form (pleiotropy)...
November 18, 2016: International Journal of Oral Science
https://www.readbyqxmd.com/read/27854241/an-investigation-into-the-relationship-between-owner-knowledge-diet-and-dental-disease-in-guinea-pigs-cavia-porcellus
#16
Rosemary Norman, Alison P Wills
Recent studies have highlighted a high prevalence of dental disease in domestic guinea pigs, yet the aetiology of this multi-factorial disease is still unclear. Factors that have been associated with dental disease include feeding a diet that is high in energy but low in fibre, feeding an insufficiently abrasive diet, a lack of dietary calcium, and genetics. As many of these factors relate to the husbandry requirements of guinea pigs, owner awareness of dietary requirements is of the utmost importance. An online questionnaire was created based on previous research into the husbandry and feeding of rabbits...
November 14, 2016: Animals: An Open Access Journal From MDPI
https://www.readbyqxmd.com/read/27846636/caries-and-innate-immunity-defb1-gene-polymorphisms-and-caries-susceptibility-in-genetic-isolates-from-north-eastern-italy
#17
Chiara O Navarra, Antonietta Robino, Nicola Pirastu, Lorenzo Bevilacqua, Paolo Gasparini, Roberto Di Lenarda, Sergio Crovella
BACKGROUND: The DEFB1 gene, encoding for the constitutively expressed human β-defensin 1 (hBD1) antimicrobial peptide is a potential candidate when studying genetic susceptibility to caries. DEFB1 genetic variations have been reported as contributing to hBD1 production impairment, leading to a greater susceptibility to be infected by oral pathogens, also leading to periodontitis. METHODS: We analysed 5 DEFB1 polymorphisms, namely 3 functional single-nucleotide polymorphisms (SNPs) at the 5'-untranslated region (UTR), -52G>A (rs1799946), -44C>G (rs1800972), and -20G>A (rs11362), 2 SNPs at the 3'-UTR, c*5G>A (rs1047031) and c*87A>G (rs1800971) SNP located in potential miRNA binding sites, looking for possible correlations with the risk to develop caries in 654 adult subjects from isolated populations of north-eastern Italy...
November 16, 2016: Caries Research
https://www.readbyqxmd.com/read/27843675/evidence-for-the-paleoethnobotany-of-the-neanderthal-a-review-of-the-literature
#18
REVIEW
Gerhard P Shipley, Kelly Kindscher
Our perception of our closest human relatives, the Neanderthals, has evolved in the last few decades from brutish ape-men to intelligent archaic human peoples. Our understanding and appreciation of their cultural sophistication has only recently extended to their diet. Only within the last few years, with new techniques and a shift in focus, have we begun to truly investigate and understand the role of plants in their diet and culture. The more we learn about Neanderthals, the more we realize that biological and cultural distinctions between them and us were relatively small...
2016: Scientifica
https://www.readbyqxmd.com/read/27824213/combined-coagulation-factor-viii-and-factor-ix-deficiency-cdf8f9-in-a-patient-from-lithuania
#19
V Ivaškevičius, B Pezeshkpoor, A Biswas, G Goldmann, S Horneff, M Gimbutyte, L Malciute, R Jurgutis, J Oldenburg
: Haemophilia A (FVIII deficiency) and haemophilia B (FIX deficiency) are X-linked inherited bleeding disorders. It is a very rare event to identify both haemophilias in the same patient. So far, only two families with such combination are reported in the literature worldwide supported by genetic background. PATIENTS AND METHODS: Evaluation of clinical data, determination of FVIII and FIX levels and genetic analysis of F8 and F9 genes by direct sequencing. RESULTS: We report on a patient having severe haemophilia B (FIX:C <1 IU dl(-1)) and mild haemophilia A (FVIII:C 18 IU dl(-1) )...
November 8, 2016: Hämostaseologie
https://www.readbyqxmd.com/read/27822519/comprehensive-transcriptome-profiles-of-streptococcus-mutans-ua159-map-core-streptococcal-competence-genes
#20
R Khan, H V Rukke, H Høvik, H A Åmdal, T Chen, D A Morrison, F C Petersen
In Streptococcus mutans, an oral colonizer associated with dental caries, development of competence for natural genetic transformation is triggered by either of two types of peptide pheromones, competence-stimulating peptides (CSPs) (18 amino acids [aa]) or SigX-inducing peptides (XIPs) (7 aa). Competence induced by CSP is a late response to the pheromone that requires the response regulator ComE and the XIP-encoding gene comS. XIP binds to ComR to allow expression of the alternative sigma factor SigX and the effector genes it controls...
March 2016: MSystems
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