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Biomedical subjects

A L Reiss

Publications and source records attributed to A L Reiss.

At least 109 records · Page 6Linked to original sources

The mesial-temporal lobe and autism: case report and review.

Human and non-human primate research has shown that pathological processes affecting the temporal lobe, particularly the amygdala and hippocampus, are related to the development of the autistic syndrome. This case report describes a young male child with left temporal oligodendroglioma, who demonstrated a constellation of autistic behaviors meeting DSM-III-R criteria for pervasive developmental disorder. Abnormalities in social interaction, affective expression and communication were particularly evident. Some of the symptoms improved after tumor resection, while other signs of qualitative abnormalities in development emerged or persisted. This case adds evidence to the hypothesis that damage to mesial-temporal structures at an early developmental period may lead to the autistic syndrome.

Autistic Disorder↗

Cognitive profiles associated with the fra(X) syndrome in males and females.

Twenty-three fragile X [fra(X)] males (mean IQ 50, mean age 10 years) and 11 fra(X) females (mean IQ 84, mean age 11.3 years) were administered the Stanford-Binet Intelligence Scale, 4th ed. (S-B). The cognitive profiles generated from the S-B indicated a pattern of subtest strengths and weaknesses that was similar for both groups. Consistent weaknesses in both groups were found in quantitative skills and short-term memory recall for visually presented, abstract stimuli, whereas a consistent strength was observed for short-term memory recall of visually presented, meaningful stimuli. Strengths in verbal labeling and comprehension and deficits in spatial visualization and visual-motor coordination were identified by the S-B for the male group but not for the female group. Fragility in the female group was negatively correlated with the S-B score for the short-term memory area and the combined S-B scores for the verbal reasoning and quantitative reasoning areas. The specific, S-B-identified cognitive strengths and weaknesses associated with the fra(X) condition are potentially useful indicators for investigation of specific cognitive process deficits associated with the fra(X) condition and the design of appropriate educational interventions for fra(X) children.

Adolescent↗

Autistic features in Joubert syndrome: a genetic disorder with agenesis of the cerebellar vermis.

Recent reports in the literature have suggested a link between abnormalities of the cerebellar vermis and the behavioral syndrome of autism. Joubert syndrome is an autosomal recessive disorder characterized by partial or complete agenesis of the cerebellar vermis. However, there is little behavioral or psychiatric description of patients with this genetic condition. In this report, the neuropsychiatric characteristics of two children with Joubert syndrome are described in detail. One child met DSM-III-R diagnostic criteria for autistic disorder, while the other displayed autistic features. The female child displayed stereotypic behavior and impairments in social interaction and communication, had a markedly restricted repertoire of interests, and showed distress over changes in the environment. The male child demonstrated perseveration and preoccupation with sounds and textures, but had no abnormalities in social interaction. Although both children showed developmental disabilities, the degree of cognitive delay was significantly less than that described in previous reports of children with Joubert syndrome. This report adds to the growing body of evidence implicating cerebellar involvement in developmental disabilities and autistic behavior.

Autistic Disorder↗

Neuroanatomy of fragile X syndrome: the posterior fossa.

The occurrence and specificity of posterior fossa abnormalities as measured from magnetic resonance images of the brain were investigated in a group of 14 males with fragile X syndrome and comparison groups consisting of 17 males with other causes of developmental disability and 18 males with normal IQs. The size of the posterior cerebellar vermis was significantly decreased and the fourth ventricle significantly increased in the group of males with fragile X syndrome compared with males in both comparison groups. These neuroanatomical abnormalities appeared to be secondary to hypoplasia rather than atrophy.

Adolescent↗

Rating problem behaviors in outpatients with mental retardation: use of the Aberrant Behavior Checklist.

Parent and teacher ratings of behavior problems of an outpatient sample of 110 children, adolescents, and young adults with IQs ranging from severe mental retardation to borderline were obtained using a modified version of the Aberrant Behavior Checklist (ABC). Using factor analytic techniques, the five-factor structure of the parent data corresponded extremely well with the five factors originally obtained from staff ratings of mentally retarded inpatients (i.e., Irritability, Withdrawal, Hyperactivity, Stereotypies, and Inappropriate Speech). Factor content was virtually identical between the parent and original ABC data with differences involving only one or two items per scale. The teacher data also revealed a factor structure that corresponded to the same five factors as the parent and original data. Although the teacher and parent factors showed a high degree of similarity, the teacher data suggested that the Stereotypies and Inappropriate Speech factors of the parent and original analyses were not the same constructs for teacher respondents. Age was related to the withdrawal factor for parent data; level of intellectual functioning was the only subject characteristic related to factor scale scores in both parent and teacher data. Test-retest reliabilities were adequate to excellent for all factors for both parent and teacher data. Parent-teacher cross-informant reliabilities were adequate for at least four of the factors. The results of the report indicate that the ABC is a useful, reliable instrument for assessing maladaptive behaviors in young, developmentally disabled outpatients.

Adolescent↗

49,XXXXY syndrome: behavioural and developmental profiles.

Behavioural, psychological, and cognitive profiles of three cases, including a 5 year old male with a 49,XXXXY karyotype and a (3;15) translocation, a 9 year old male with a 49,XXXXY karyotype, and a 32 year old male with 48,XXXY/49,XXXXY mosaicism, are presented. Significant behavioural problems were seen in the two older patients. The degree of mental retardation and impairment of language abilities were shown to be more severe in the older subjects as well. These findings are discussed with respect to the effects of the X chromosome on brain development.

Adult↗

Neuroanatomy in fragile X females: the posterior fossa.

The relative homogeneity of the neuropsychiatric phenotype in individuals with fragile (fra) X syndrome suggests that there are consistent central nervous system (CNS) abnormalities underlying the observed cognitive and behavioral abnormalities. In this study, the neuroanatomy of the posterior fossa and other selected CNS regions in 12 young fra X females were compared with those of a group of 12 age-, sex-, and IQ-matched females without evidence of the fra X syndrome. Fra X females were shown to have decreased size of the posterior cerebellar vermis and increased size of the fourth ventricle, findings that are identical to those previously reported for fra X males. When compared with fra X male and nonfra X control groups, the distribution of the posterior-vermis and fourth-ventricle variables for the fra X female group was intermediate. These results support the hypothesis that the fra X genetic abnormality leads to hypoplasia of the posterior cerebellar vermis, a neuroanatomical variation of potential importance to both developmental and neuropsychiatric syndromes.

Adolescent↗

Fragile X syndrome.

Fragile X syndrome is the most important X-linked etiology of mental retardation and developmental disability currently known. Accumulating evidence also indicates that male and female carriers of the fragile X genetic abnormality demonstrate a relatively specific pattern of psychiatric disturbance. Fragile X males frequently manifest behaviors from the autistic spectrum whereas females show dysfunction in social interaction, thought processes, and affective regulation. In this review, an overview of the fragile X syndrome is presented with a focus on the occurrence of particular neuropsychiatric characteristics in males and females. Relevant data from recent genetic and neurobiological research is also described. The ability to study individuals with a specific genetic cause of psychopathology such as fragile X syndrome makes this condition of particular interest to biological psychiatry.

Autistic Disorder↗

Fragile X syndrome, DSM-III-R, and autism.

Although reports of autistic behavior in fragile X males have been published for 8 years, there is little information about specific behaviors shown by fragile X males that are suggestive of the diagnosis of autism. The new diagnostic criteria for autistic disorder contained in the DSM-III-R provided the opportunity for more closely investigating the topography of autistic behavior in 17 fragile X males and the effects of age and IQ on its occurrence. The criteria most frequently met by these subjects were related to deficits in social interaction with peers, abnormalities in verbal and nonverbal communication, stereotypic motor behavior, and unusual responses to sensory stimuli. Fragile X subjects did not frequently show abnormalities in attachment behaviors and reciprocal interaction with caregivers. There were no discernable age or IQ effects. The importance and implications of these findings are discussed and the need for greater exploration of autism "subtypes" is emphasized.

Adolescent↗

Methylation status of genes flanking the fragile site in males with the fragile-X syndrome: a test of the imprinting hypothesis.

Laird has suggested that the mutation responsible for the fragile X (FraX) syndrome interferes with the process of X chromosome reactivation in oocytes, thus blocking the transcription of loci at or neighboring the fragile site (Xq27.3) and producing the clinical FraX phenotype; he has also suggested that the transcriptional block might result from inappropriate DNA methylation. We have explored the latter possibility by examining the methylation status of several genes flanking the fragile site in eight FraX males from seven unrelated families. These genes (HPRT, G6PD, P3, and GdX), contain 5' clusters of CpG dinucleotides which are differentially methylated in transcriptionally active and inactive loci. Using the methylation-sensitive restriction enzyme, HpaII, we observed no differences between FraX and normal males in the methylation either of CpG islands in any of these genes or in nonclustered CpGs within the body of the HPRT gene. The same was true for the CpG cluster in intron 22 of the clotting factor VIII gene. In each gene, the island is methylated on the inactive X chromosome and not on the active one, but in no case were these islands methylated in FraX males. The four anonymous loci (DXS98, DXS304, DXS52, and DXS15) that are closely linked to the FraX locus (the closest is within 5 centimorgans) are not differentially methylated on active and inactive X, nor are they unusually methylated in FraX males. Therefore, our observations provide no evidence that DNA methylation in the vicinity of the FraX locus has a role in producing the clinical phenotype of the FraX syndrome.

Blotting, Southern↗

Parental inheritance and psychological disability in fragile X females.

Studies of adult female carriers of the fragile X chromosome indicate that certain psychological problems occur with a greater frequency and severity than expected. This study examines the association of parental origin of the fragile X chromosome and of fragility detected in the karyotype with measures of social, educational, and psychological functioning in a group of adult fragile X females of normal intelligence. The results show that, as a group, women who inherit the fragile X chromosome from their mother and who demonstrate positive fragility in the karyotype (MI+ group = [maternal inheritance with positive fragility]) manifest significantly more impairment of social, educational, and psychological functioning when compared with fragile X females with paternal inheritance or negative fragility or with a matched control group comprising non-fragile X women. In particular, MI+ women show lower levels of both educational achievement and socioeconomic status and a greater degree of disturbance in communication, socialization, affect, and thought processes. These clinical findings are consistent with the recently advanced hypothesis which proposes that a two-stage process leading to chromosome imprinting in a preoogonial cell causes the fragile X syndrome.

Anxiety Disorders↗

Psychiatric disability in female carriers of the fragile X chromosome.

Fragile X syndrome, an X-linked genetic condition, is an important genetic cause of mental retardation in males. In addition to mental retardation, hemizygous males with fragile X syndrome appear to have a greater likelihood of displaying behaviors classified under the diagnostic category of pervasive developmental disorder than would be expected on the basis of mental retardation alone. Although the majority of female heterozygotes with the fragile X genetic defect are of normal intelligence, our clinical work with this population and a recent case report have suggested that females with fragile X syndrome have an increased rate of schizophrenia spectrum and affective disorders. In this study, the relationship of the fragile X genetic defect to psychopathology in female heterozygotes is investigated by psychiatric evaluation of 35 obligate female carriers of the fragile X chromosome and a comparison group of 24 fragile X-negative controls. Female fragile X carriers were found to have a greater frequency of psychopathology associated with schizophrenia spectrum diagnoses, particularly schizotypal features. A weaker association between the fragile X genetic defect and chronic affective disorders was detected. The specificity of the neuropsychiatric phenotype occurring in particular genetic conditions such as the fragile X syndrome adds a potentially valuable tool to the study of psychopathology in the general population.

Child Development Disorders, Pervasive↗

Preliminary communication: neuroanatomical variations of the posterior fossa in men with the fragile X (Martin-Bell) syndrome.

Four men with fragile X (fra (X], or Martin-Bell, syndrome were studied by magnetic resonance imaging (MRI) to determine whether detectable abnormalities of the cerebellum were present. The cerebellum was chosen because of the apparently increased tendency for fra (X) patients to demonstrate autistic behavior and accumulating evidence implicating cerebellar abnormalities in autism. Compared with a control group of four normal men, fra (X) patients had a significantly decreased area of the cerebellar vermis, particularly the posterior portion, on planimetric analysis in the midsagittal plane. The pons and fourth ventricular areas also were decreased and increased, respectively, in the fra (X) men. Neuroanatomical and animal research increasingly implicates the cerebellar vermis as an important component in functional brain systems subserving sensory and motor integration, learning, and modulation of affect, motivation, and social behavior. Thus, vermis dysfunction could account for many of the behavioral and cognitive abnormalities observed in fra (X) males, particularly those which overlap with the behavioral syndrome of autism.

Adult↗

Effects of fenfluramine on social behavior in autistic children.

Deficit in social interaction is a primary component of infantile autism. However, in the majority of drug studies, social interaction has not been measured consistently over time. Therefore, we examined, in a crossover design, the effect of fenfluramine on the social interactions of seven autistic children. Social interaction was measured one to three times per week, while the children were in open placebo, placebo, or drug phases of the study. The results demonstrated that the effect of fenfluramine on social interaction was inconsistent across children, with two children possibly demonstrating a tolerance to the behavioral effects of the drug. The results are discussed with respect to genetic and pharmacologic factors.

Autistic Disorder↗

Autism and genetic disorders.

The syndrome of autism has been documented as occurring in association with a wide variety of genetic conditions. Autistic patients with a coexistent genetic condition, however, are not behaviorally or developmentally distinct from autistic patients for whom there is no known etiology or associated organic condition. This report reviews the literature linking autistic behavior with genetic conditions. Genetic, neurodevelopmental, and neuropathological findings in three genetic conditions which frequently give rise to autism are presented in detail. On the basis of this review, two hypotheses are supported: autism is a behaviorally defined phenotype which arises from diverse causes of central nervous system (CNS) damage, and the autistic phenotype represents only one point along a continuum of psychological dysfunction resulting from CNS damage. Current theories of genetic influences on brain development are reviewed, with emphasis on the relationships among qualitative, quantitative, and temporal abnormalities of CNS maturation and behavioral dysfunction. A hypothesis of abnormal brain development resulting from dysfunctional myelination is proposed as a potential etiologic factor in autism.

Adult↗

Inpatient clinical research: its importance in psychiatry and psychopharmacology.

We have outlined the essential components found in an inpatient psychiatry research unit from the point of patient recruitment through discharge. In virtually every phase of a patient's hospitalization on the unit, there is the potential for significant tension between research and clinical goals. We conclude that, as Braff and associates have suggested, clinical and research interests are compatible when both receive appropriate support. We have also discussed the potential advantages of an inpatient research setting for patient care. Because of the washout period, there is greater opportunity for an extended diagnostic assessment and response to the therapeutic milieu alone. The attention and priority patients receive during the research phase can be of significant therapeutic benefit. Findings from research protocols can be used to help with diagnosis and clinical care. Working on an inpatient research unit provides residents and other trainees with special learning experiences. In particular, observational and diagnostic skills are sharpened. Techniques of non-pharmacologic behavioral management are added to the trainees' repertoire of therapeutic interventions. By nature, the research experience promotes creative thinking and problem solving. In this era of fiscal restrictions and cost accountability in medicine, potential advantages for immediate patient care and for staff training are only secondary reasons which justify the existence of inpatient research centers in psychiatry. We must also ask what specific and unique research information an inpatient research setting offers compared to less expensive outpatient research environments. The first factor to be considered is the ability to study individuals whose illness is so severe as to make outpatient management difficult or impossible. It is becoming increasingly clear that for many categories of psychiatric disorders, there is a spectrum of severity of possible behavioral manifestations seen in affected individuals. In depressive illness, for example, the spectrum of expression appears to range from dysthymic disorder to major depressive disorder with psychotic features. Individuals with more severe symptomatology tend to create the greater cost to society because of their correspondingly greater degree of dysfunctional behavior, need for repeated and extended hospitalization, requirement for social services, etc. Such individuals, therefore, need to be studied in a research setting at least as much as patients with milder manifestations of psychiatric illness. This would not be possible without the control, structure, and staffing found in an inpatient setting.(ABSTRACT TRUNCATED AT 400 WORDS)

Adult↗