M G Butler

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..Extreme X-inactivation skewness may also lead to additional risks for X-linked recessive disorders in PWS females with UPD and extreme X-chromosome skewness...

..We suggest that PTEN gene testing be considered for patients with autistic behaviour and extreme macrocephaly. The gene findings may impact on recurrence risks as well as medical management for the patient...

..Furthermore, most PWS subjects had copy number variation (CNV) of 50 kb or larger in other chromosome regions; most common were deletions and duplications of 8p and 3q, previously recognized sites of CNV in the human genome...

..However, a lower muscle mass was found in the PWS subjects...

..Several of these disorders are discussed and illustrated...

..Our data indicate that there is a significant reduction of EE in individuals with PWS resulting from reduced activity but also from lower energy utilization due to reduced LBM which consists primarily of muscle...

..The possibility that obestatin may contribute to the failure to thrive which is common in infants with PWS warrants further investigation...

..It may not be caused by loss, or active degradation, of bone matrix measurable by the methods described in this study further supporting the possible need for hormone therapy during adolescence...

..These results suggest that differences in the peripheral CCK response to FFA levels may be a factor contributing to the altered satiety response in PWS subjects...

..Recommendations for presedation evaluation and checklist items are given that may impact on the delivery of care for these patients...

..PWS subjects with increased VFA may be at a higher risk of obesity-related complications compared to PWS subjects without increased VFA...

..CONCLUSIONS: Our results suggest that differences in expression of candidate genes may contribute to phenotypic differences between PWS subjects with deletion or UPD and warrant further investigations...

..3 kb) imprinting center (IC) deletions, with no overlap in MFI values compared with normal loci. Using this diagnostic QMH assay, the precise deleted genomic interval could be ascertained in all PWS subjects examined in the present study...

..2 deletion or DiGeorge syndrome...

..X chromosome skewness has been reported in female carriers of other neurological disorders such as X-linked mental retardation, adrenoleukodystrophy and Rett syndrome...

..The hand pattern variability index was outside of the normal range, indicating an abnormal MCPP with multivariate analysis. The MCPP analysis may be useful as a tool for diagnosis in screening subjects for Noonan syndrome...

..For accessible tissues to be informative for genetic analysis, a high degree of concordance of genetic findings among tissue types is required...

..Similarly, recessive alleles unmasked by the deletion could also contribute to the phenotype...

..Our study provides insight into global epigenetic regulation in the human brain in relationship to controls and potentially novel targets for hypothesis generation and follow-up studies of alcoholism...

..To investigate the neural mechanisms of food motivation in children and adolescents, and examine brain activation differences between healthy weight (HW) and obese participants...

..MLPA is a relatively simple, cost-effective technique found to be useful and accurate for methylation status, copy number and analysis of genetic subtype in PWS and AS, as well as other chromosome 15 abnormalities...

..Our analysis identified previously unappreciated changes in gene expression which may contribute to the clinical manifestations seen in PWS...

..After eating a meal, the PWS group showed hyperfunction in limbic and paralimbic regions that drive eating behavior (e.g., the amygdala) and in regions that suppress food intake (e.g., the medial PFC)...

..Our results indicate that interconnected mechanisms can produce subtle and unexpected changes in gene expression that may help explain the phenotypic differences observed among the genetic subtypes of AS...

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..Additional studies including quantitative gene expression measurements will be required to further evaluate the role of these genes in the eating disorder seen in PWS...

..Here, we describe the clinical presentation of PWS, review the current understanding of causative cytogenetic and molecular genetic mechanisms, and discuss future directions for research...

..The Reiss Screen cut-off scores were used to determine whether differences occurred between the subtypes at a clinically significant level. These findings offer insight into the health care needs of people with PWS...

..Our studies suggest increased expression of several genes in the 3p duplication region, including GHRL and PPARG, which may contribute to the phenotypic features in our 3p duplication subject...

..Increased levels of C-reactive protein (>3.0 mg/L) are associated with cardiovascular disease suggesting subjects with Prader-Willi syndrome as well as obese subjects are at a similar increased risk...

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..We follow two previously reported patients with SD [Patients 3, 4 in Langer et al. 1996; Am J Med Genet 63: 20-27]. Since the original publication, additional findings were identified in these patients...

..The physician should consider an emergent evaluation for gastric rupture and necrosis in individuals with PWS who present with vomiting and abdominal pain...

..One patient was found to have a frontal perifalcine mass resembling a meningioma at age 5 years. This is the second apparent occurrence of this specific tumor in M-CM...

..Most solid tumors and skeletal neoplasms are polyclonal in nature. Our study indicates that chordoma is polyclonal in its pattern of proliferation...

..This constellation of anomalies is consistent with the diagnosis of oculoauriculofrontonasal syndrome (OAFNS) which appears to be a distinct condition from either OAVS or FND but with overlapping features...

..Affected males can also present with vestibular dysfunction that is associated with delayed developmental motor milestones. Intrafamilial variability occurs...

..Cytogenetic heteromorphisms (normal variants) pose diagnostic dilemmas. Common Giemsa-band heteromorphisms are not described in the literature, although Giemsa-banding is the method most frequently used in cytogenetic laboratories...

..Anophthalmia, to our knowledge, has not been reported previously in Fryns syndrome; however, eye findings are common, particularly microphthalmia and cloudy cornea...

..This study indicates that factors other than the X-inactivation process may impact on the expression of X-linked genes resulting in an overall similar gender expression for both X-linked and autosomal genes...

..Additional research is needed to identify the function of these genes and their interaction with gene networks to clarify the potential role they play in central nervous system development and function...

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..These results, along with other recent reports, suggest that the cumulative effect of modest changes in expression of many genes, especially genes involved in energy metabolism, contribute to the failure to thrive of infants with PWS...

..We wish to alert careproviders that this fascination with water and water-related activities may contribute to death and that these individuals should be closely supervised when in the presence of water...