Biomedical subjects

G Aren

Publications and source records attributed to G Aren.

4 recordsLinked to original sources

PubMed2005

Phenotype of ENAM mutations is dosage-dependent.

Five mutations in the ENAM gene have been found to cause hypoplastic amelogenesis imperfecta (AI), with phenotypes ranging from localized enamel pitting in carriers to severe hypoplastic AI. To determine the generality of ENAM mutations in hypoplastic AI, we sequenced the ENAM gene in ten Turkish families segregating autosomal hypoplastic AI. In two families, ENAM mutations were found. A novel nonsense mutation (g.12663C>A; p.S246X) was identified in one family segregating local hypoplastic AI as a dominant trait. Affected individuals in a second family segregating autosomal-recessive AI were compound heterozygotes for a novel insertion mutation (g.12946_12947insAGTCAGTACCAGTACTGTGTC) and a previously described insertion (g.13185_13186insAG) mutation. Heterozygous carriers of either insertion had a localized enamel-pitting phenotype. These findings substantiate that enamel phenotypes of ENAM mutations may be dose-dependent, with generalized hypoplastic AI segregating as a recessive trait and localized enamel pitting segregating as a dominant trait.

Adenine↗

PubMed2003

Novel ENAM mutation responsible for autosomal recessive amelogenesis imperfecta and localised enamel defects.

The genetic basis of non-syndromic autosomal recessive forms of amelogenesis imperfecta (AI) is unknown. To evaluate five candidate genes for an aetiological role in AI. In this study 20 consanguineous families with AI were identified in whom probands suggested autosomal recessive transmission. Family members were genotyped for genetic markers spanning five candidate genes: AMBN and ENAM (4q13.3), TUFT1 (1q21), MMP20 (11q22.3-q23), and KLK4 (19q13). Genotype data were evaluated to identify homozygosity in affected individuals. Mutational analysis was by genomic sequencing. Homozygosity linkage studies were consistent for localisation of an AI locus in three families to the chromosome 4q region containing the ENAM gene. ENAM sequence analysis in families identified a 2 bp insertion mutation that introduced a premature stop codon in exon 10. All three probands were homozygous for the same g.13185_13186insAG mutation. These probands presented with a generalised hypoplastic AI phenotype and a class II openbite malocclusion. All heterozygous carriers of the g.13185_13186insAG mutation had localised hypoplastic enamel pitting defects, but none had AI or openbite. The phenotype associated with the g.13185_13186insAG ENAM mutation is dose dependent such that ARAI with openbite malocclusion segregates as a recessive trait, and enamel pitting as a dominant trait.

Amelogenesis Imperfecta↗

PubMed2002

Mobius syndrome: a case report.

Mobius Syndrome is characterized by showing unilateral facial nerve palsy of the sixth and seventh nerves, lack of facial expression, inability to smile and to tightly close the right eyelids. In this report, a 7-year-old-boy with Mobius syndrome is presented. He had asymmetry of facial expression, anomalies of fingers and severe tooth decay. After dental treatment, the periodic re-care visits should be done according to the eruption pattern.

Child↗

PubMed2001

The effect of bone marrow transplantation on systemic and oral health in Fanconi's aplastic anemia.

Fanconi's anemia (FA) is an autosomal-recessive disorder characterized by a progressive pancytopenia, diverse congenital abnormalities and increased predisposition to malignancy. Sixteen children with FA, aged between 4 to 16 were divided into two groups according to treatments. Nine children had bone marrow transplantation and seven children were treated with steroid and/or anapolan. The changes in dental caries, caries-associated microflora, salivary status and periodontal health were investigated in children with FA. Data were analyzed by one-way ANOVA. A statistically significant difference was found in hematological findings between children who have received bone marrow transplantation (BMT+) and the others, who have not received (BMT-). There was no significant difference in dental caries experience, salivary flow rate, buffering capacity, mutans streptococci and Lactobacilli levels between the study groups. A statistically significant difference was found in gingival index, plaque index, bleeding on probing, probing depth scores between the patients with FA in BMT(+) and BMT(-) groups (p<.05). In conclusion, besides systemic control, additional preventive measures during their whole life to maintain oral health is necessary in these children.

Adolescent↗