Bethlem myopathy is an early-onset benign autosomal dominant myopathy with contractures caused by mutations in collagen type VI genes. It has been reported that onset occurs in early childhood. We investigated the natural course of Bethlem myopathy in five previously published kindreds and two novel pedigrees, with particular attention to the mode of onset in 23 children and the progression of ...

Non-ketotic hyperglycinemia (NKH) is a rare inborn error of metabolism and is caused by a glycine cleavage system deficiency. Eighty-five percent of patients present with the neonatal type of NKH, the infants initially develop lethargy, seizures, and episodes of apnea, and most often death. Between 60-90% of cases are caused by mutations in the glycine decarboxylase (GLDC). We believed that mor...

Introduction. The coexistence of Down and Turner syndromes due to double chromosome aneuploidy is very rare; it is even more rare to find the presence of a double monoclonal chromosomal abnormality. Objective. To report a unique case of double monoclonal chromosomal abnormality with trisomy of chromosome 21 and an X ring chromosome in all cells studied; no previous report has been found. Case R...

BACKGROUND The increase in survival of premature newborns has sparked growing interest in the prediction of their long-term neurodevelopment. OBJECTIVE To estimate the incidence of neuromotor abnormalities at the corrected age of 12 months and to identify the predictive factors associated with altered neuromotor development in very low birth weight premature infants. METHOD Cohort study. Th...

Prader-Willi syndrome (PWS) is a neurodevelopmental disorder characterized by neonatal hypotonia, developmental delay/intellectual disability, and characteristic feeding behaviors with failure to thrive during infancy; followed by hyperphagia and excessive weight gain later in childhood. Individuals with PWS also manifest complex behavioral phenotypes. Approximately 25% meet criteria for autism...

P rader-Willi syndrome (PWS) is a neurogenetic disorder resulting from the absence of a normal paternal contribution to the chromosome 15q11-13 region. The clinical manifestations of PWS are: reduced fetal activity during pregnancy, a transient severe hypotonia and feeding problems in the neonatal period, a variable degree of mental retardation, hyperphagia, obsessive compulsive features such a...

BACKGROUND Thyroid hormone is crucial in the development of different organs, particularly the brain. MCT8 is a specific transporter of triiodothyronine (T3) hormone and MCT8 gene mutations cause a rare X-linked disorder named MCT8 deficiency, also known as Allan-Herndon-Dudley syndrome, characterized by psychomotor retardation and hypotonia. Typically, elevation of T3 and delayed myelination i...

PURPOSE The term hypotonia is often used to describe children with reduced muscle tone, yet it remains abstract and undefined. The purpose of this study was to identify characteristics of children with hypotonia to begin the process of developing an operational definition of hypotonia. METHODS Three hundred physical and occupational therapists were systematically selected from the memberships...

Congenital nephrotic syndrome (CNS) can be caused by neonatal infections and renal diseases that usually occur in early infancy. The most common CNS is the Finnish type, which is an autosomal recessively inherited disease characterized by intrauterine onset of massive proteinuria. In this study, we presented a preterm neonate confirmed as the first case of CNS in Iran by genetic study, who was ...