Prader Willi and Angelman syndromes: exemplars of genomic imprinting

Neuropsychological Profile and Neuroimaging in Patients with 22Q11.2 Deletion Syndrome: A Review Keywords:

22q11.2 Deletion Syndrome is associated with cognitive, behavioural, and psychiatric problems and is known to affect brain structure. Recently, 22q11.2 Deletion Syndrome has been proposed as a disease model for a genetic subtype of schizophrenia. In this paper we discuss the currently available literature on neurocognitive functioning and brain anatomy in patients with 22q11.2 Deletion Syndrome, and how this contributes to our understanding of the neurobiology of schizophrenia. Research on cognitive functioning in 22q11.2 Deletion Syndrome patients suggests a specific cognitive profile with impairments on arithmetical, visuo-spatial, and executive tasks and relatively preserved language skills. Prominent findings of neuroimaging studies in 22q11.2 Deletion Syndrome patients are: reduction of overall brain volume, midline defects, structural alterations of cerebellum and frontal lobe, white matter abnormalities, and decreased grey matter volumes in parietal and temporal areas. We describe how brain abnormalities in patients with 22q11.2 Deletion Syndrome may contribute to the understanding of the clinical syndrome including cognitive impairments, psychotic symptoms, and social and communication problems.

Behavioural phenotypes: An emerging specialist role for nurses

The idea that behaviour can be influenced by genetics is not new and developments in the field of behavioural genetics suggest this is an area of increasing relevance to healthcare professionals who support people who have learning disabilities associated with genetic disorders. This paper considers both the evidence for behavioural phenotypes and the possible roles healthcare professionals have when supporting affected individuals and their families. The paper argues that nurses in all areas of health care need to have a foundation of skill and knowledge of behavioural phenotypes to ensure effective care is provided for individuals and their families. In addition, the paper proposes that a specialist nursing role is essential in providing direct support to clients and their families as well as in providing a consultancy and educational role to the health and social care professionals who support these families.

Language skills in children with velocardiofacial syndrome (deletion 22q11.2)

OBJECTIVE

To further define the language profile of children with velocardiofacial syndrome (VCFS) and explore the influence of parental origin of the deletion on language.

STUDY DESIGN

Children and adolescents with VCFS (n = 27) were group-matched for sex, age, and IQ with 27 children and adolescents with idiopathic developmental delay. Fifty-four typically developing control subjects were also included in the analyses investigating word association abilities.

RESULTS

Children with VCFS had significantly lower receptive than expressive language skills, a unique finding when compared with IQ-matched control subjects. However, no significant differences in word association were detected. Children with a deletion of paternal origin score significantly higher on receptive language when compared with children with a deletion of maternal origin.

CONCLUSIONS

The Clinical Evaluation of Language Fundamentals-III results suggest that children with VCFS show more severe deficits in receptive than expressive language abilities. Language skills of children with VCFS could be influenced by parental origin of the deletion and thus related to neuroanatomic alterations at the deletion site.