Dysregulation of GSK3β-Target Proteins in Skin Fibroblasts of Myotonic Dystrophy Type 1 (DM1) Patients

Myotonic dystrophy type 1 (DM1) is the most common monogenetic muscular disorder of adulthood. This multisystemic disease is caused by CTG repeat expansion in the 3'-untranslated region of the DM1 protein kinase gene called DMPK. DMPK encodes a myosin kinase expressed in skeletal muscle cells and other cellular populations such as smooth muscle cells, neurons and fibroblasts. The resultant expanded (CUG)n RNA transcripts sequester RNA binding factors leading to ubiquitous and persistent splicing deregulation. The accumulation of mutant CUG repeats is linked to increased activity of glycogen synthase kinase 3 beta (GSK3β), a highly conserved and ubiquitous serine/threonine kinase with functions in pathways regulating inflammation, metabolism, oncogenesis, neurogenesis and myogenesis. As GSK3β-inhibition ameliorates defects in myogenesis, muscle strength and myotonia in a DM1 mouse model, this kinase represents a key player of DM1 pathobiochemistry and constitutes a promising therapeutic target. To better characterise DM1 patients, and monitor treatment responses, we aimed to define a set of robust disease and severity markers linked to GSK3βby unbiased proteomic profiling utilizing fibroblasts derived from DM1 patients with low (80- 150) and high (2600- 3600) CTG-repeats. Apart from GSK3β increase, we identified dysregulation of nine proteins (CAPN1, CTNNB1, CTPS1, DNMT1, HDAC2, HNRNPH3, MAP2K2, NR3C1, VDAC2) modulated by GSK3β. In silico-based expression studies confirmed expression in neuronal and skeletal muscle cells and revealed a relatively elevated abundance in fibroblasts. The potential impact of each marker in the myopathology of DM1 is discussed based on respective function to inform potential uses as severity markers or for monitoring GSK3β inhibitor treatment responses.

Birmingham and Lambeth Liver Evaluation Testing Strategies (BALLETS): a prospective cohort study

OBJECTIVE

To evaluate mildly abnormal liver function test (LFT) results in general practice among patients who do not have known liver disease.

DESIGN

Prospective cohort study of people with abnormal LFT results identified in primary care. Participants were intensively investigated using a common protocol and followed up for 2 years. Substudies investigated the psychological sequelae of abnormal test results, clinicians' reasons for testing, decision options when LFT results were abnormal and early detection of liver fibrosis.

SETTING

Eleven primary-care practices: eight in Birmingham and three in Lambeth.

PARTICIPANTS

Adults with abnormal LFT results who did not have pre-existing or obvious liver disease. Eight analytes were included in the panel of LFTs.

MAIN OUTCOME MEASURES

Statistical tests were used to identify the interactions between clinical features, the initial pattern of abnormal LFT results and (1) specific viral, genetic and autoimmune diseases, such as viral hepatitis, haemochromatosis and primary biliary cirrhosis; (2) a range of other serious diseases, such as metastatic cancer and hypothyroidism; (3) 'fatty liver' not associated with the above; and (4) the absence of detectable disease.

RESULTS

Fewer than 5% of people with abnormal LFT results had a specific disease of the liver, and many of these were unlikely to need treatment. The diagnostic potential of the LFT panel is largely subsumed into just two analytes: alanine aminotransferase (ALT) and alkaline phosphatase (ALP). Gamma-glutamyltransferase (GGT) offers a small increase in sensitivity at the margin at the cost of a large loss of specificity. Eighty-four per cent of abnormal LFT results remain abnormal on retesting 1 month later. In many cases, carrying out a definitive or specific test will be more efficient than repeating LFTs, with a view to specific testing only if the test remains abnormal. An ultrasound diagnosis of 'fatty liver' was present in nearly 40% of patients with abnormal LFTs and a small amount of weight loss over 2 years was associated with a reduced incidence of liver fat. There was a J-shaped relationship between alcohol intake and fatty liver in men. An abnormal LFT result causes temporary anxiety, which does not appear to promote sustained behaviour change.

CONCLUSIONS

Liver disease is rare among people with abnormal LFT results in primary care. Only two analytes (ALT and ALP) are helpful in identifying the majority of liver disease. GGT adds little information in return for a high false-positive rate but it is sensitive to alcohol intake. LFT results seldom revert from abnormal to normal over a 1-month period, and modelling shows that repeating an abnormal LFT panel, as recommended in the current guidelines, is inefficient. LFTs are often undertaken to meet perceived patient need for a blood test, but as they are neither specific nor indicative of any particular disease they are among the least suitable tests for this purpose. Obesity and raised ALT provide strong evidence for a presumptive diagnosis of 'fatty' liver. Abnormal LFTs and 'fatty' liver provoke only short-term anxiety and neither is associated with sustained weight loss. Even a small amount of weight loss reduces liver fat.

FUTURE WORK RECOMMENDATIONS

(1) the cases of 'fatty liver' and controls should be followed up in the long term to identify features that predict development of hepatosteatosis and then cirrhosis; (2) the acceptability of replacing the traditional six- to eight-analyte LFT panel with a drop down menu including the ALT/ALP combination should be evaluated.

FUNDING

The National Institute for Health Research Health Technology Assessment programme.

Psychological consequences of predictive genetic testing: a systematic review

The aim of this systematic literature review is to describe the psychological consequences of predictive genetic testing. Five databases were searched for studies using standardised outcome measures and statistical comparison of groups. Studies were selected and coded by two independent researchers. From 899 abstracts, 15 papers, describing 11 data sets, met the selection criteria for the review. The studies were of predictive genetic testing for Huntington's disease, hereditary breast and ovarian cancer, familial adenomatous polyposis and spinocerebellar ataxia. One involved children; the rest were of adults. None of the 15 papers reported increased distress (general and situational distress, anxiety and depression) in carriers or non-carriers at any point during the 12 months after testing. Both carriers and non-carriers showed decreased distress after testing; this was greater and more rapid amongst non-carriers. Test result (ie being a carrier or non-carrier) was rarely predictive of distress more than one month after testing (predictive in two of 14 analyses). Pre-test emotional state was predictive of subsequent distress in 14 of 27 analyses. There is a lack of informative studies in this field. The studies reviewed suggest that those undergoing predictive genetic testing do not experience adverse psychological consequences. However, the studies are of self-selected populations who have agreed to participate in psychological studies and have been followed up for no more than three years. Most research has been of testing for Huntington's Disease and included follow-up of no more than one year. The results suggest that testing protocols should include a pre-test assessment of emotional state so that post-test counselling can be targeted at those more distressed before testing. None of the studies experimentally manipulated the amount or type of counselling provided. The relationship between counselling and emotional outcome is therefore unclear and awaits empirical study.

Consensus development methods: a review of best practice in creating clinical guidelines

BACKGROUND

Although there is debate about the appropriate place of guidelines in clinical practice, guidelines can be seen as one way of assisting clinicians in decision-making. Given the likely diversity of opinion that any group of people may display when considering a topic, methods are needed for organising subjective judgements. Three principal methods (Delphi, nominal group technique, consensus development conference) exist which share the common objective of synthesising judgements when a state of uncertainty exists.

OBJECTIVES

To identify the factors that shape and influence the clinical guidelines that emerge from consensus development methods and to make recommendations about best practice in the use of such methods.

METHODS

Five electronic databases were searched: Medline (1966-1996), PsychLIT (1974-1996), Social Science Citation Index (1990-1996), ABI Inform and Sociofile. From the searches and reference lists of articles a total of 177 empirical and review articles were selected for review.

RESULTS

The output from consensus development methods may be affected by: the way the task is set (choice of cues, recognition of contextual cues, the focus of the task, the comprehensiveness of the scenarios); the selection of participants (choice of individuals, degree of homogeneity of the group, their background, their number); the selection and presentation of scientific information (format, extent to which its quality and content is assessed); the way any interaction is structured (number of rating rounds, ensuring equitable participation, physical environment for meetings); and the method of synthesising individual judgements (definition of agreement, rules governing outliers, method of mathematical aggregation).

CONCLUSIONS

Although a considerable amount of research has been carried out, many aspects have not been investigated sufficiently. For the time being at least, advice on those aspects has, therefore, to be based on the user's own commonsense and the experience of those who have used or participated in these methods. Even in the long term, some aspects will not be amenable to scientific study. Meanwhile, adherence to best practice will enhance the validity, reliability and impact of the clinical guidelines produced.

Revealed identity: a study of the process of genetic counselling

This paper describes a qualitative study of the processes employed within a genetic counselling consultation. These processes, it is argued, can be seen to provide the patient with a genetic identity. But unlike the new identity conferred by the diagnosis of many chronic medical conditions a genetic identity is presented as an old one that is now revealed. This represents a reversal of the stigmatising process: instead of a spoiled identity replacing an actual one, the genetic consultation involves revealing an actual identity in the place of a previously presumed one. In this way, genetic counselling reconstructs identity in the past as well as in the future.

Parents' responses to predictive genetic testing in their children: report of a single case study

There is a widely held view among health professionals that predictive genetic testing of children for late onset diseases is not desirable clinical practice. Yet, little is known about the views of parents, or their responses, to predictive genetic testing in their children. Since such testing is being carried out in some genetic centres, the opportunity was taken to conduct a single case study of the parents of 2 and 4 year old sisters who were tested for the gene for familial adenomatous polyposis. Interviews before testing, after, and 15 months later showed a stable attitude, that parental responsibility included making decisions about such testing, and that the role of health professionals should be one of information giving rather than decision making. These parents had no regrets about having their children tested and reported no changes in their behaviour towards either the child who tested positively or the child who tested negatively. Using standardised scales, mood was found to be within the normal range both before and after testing in the mother and father. This case study is a first step towards systematic empirical studies determining the consequences of acquiescing to parents' requests for genetic testing in their children.

Attitudes towards termination for fetal abnormality: comparisons in three European countries

Attitudes towards termination for a range of genetic conditions were studied in health professionals and lay people in three European countries: Germany, Portugal and the UK. The health professionals consisted of geneticists in all countries and additionally obstetricians from Portugal and the UK. The lay persons consisted of pregnant women, and male and female non-medical university employees. In all, more than 1,700 study participants completed questionnaires. Overall, health professionals were more likely than the lay persons to report that they would opt for termination following diagnosis of a fetal abnormality. Differences were found between countries and study groups. German respondents were least likely to report that they would undergo termination in the case of a fetal abnormality while Portuguese respondents were most likely to report that they would undergo a termination. Further studies are needed to determine first the extent to which differences between health professionals and lay samples reflect a difference in perception of disability, including tolerance of having a child with a disability; and second, whether such differences result in health professionals presenting termination of pregnancy in a way that is not concordant with patients' value systems.

Public attitudes towards the selection of desirable characteristics in children

This paper reports the results of a survey of 973 members of the British public in which attitudes towards methods of achieving desired personal characteristics in their children are compared. While there was little support for the use of gene manipulation to achieve desirable traits in children, the proportion who would consider doing so has more than doubled in the 12 months since the public were last polled on this question. The small but growing public support for the use of gene therapy to enhance human characteristics points to the need for a debate involving the public as well as scientists before such techniques are feasible.

Counselling following diagnosis of a fetal abnormality: the differing approaches of obstetricians, clinical geneticists, and genetic nurses

Women receiving a positive diagnosis of an abnormality during pregnancy may be counselled about a termination by one of several types of health professionals including obstetricians, geneticists, and genetic nurses. There is anecdotal evidence to suggest that these groups differ in both their approaches to counselling and their attitudes towards abnormality. The aim of the current study is to document how genetic nurses, geneticists, and obstetricians describe their own counselling of women following the diagnosis of specific fetal abnormalities. Obstetricians reported counselling in a significantly more directive fashion than did geneticists, who in turn reported counselling in a more directive way than did genetic nurses. The extent to which the groups differed in their reported approaches varied across conditions. The most marked difference was evident for Down's syndrome: 94% of genetic nurses, 57% of geneticists, and 32% of obstetricians reported counselling non-directively. Future research needs to focus on what these different groups see as the objectives of counselling in this situation, how they actually counsel, and with what effects.

The impact of population based screening for carriers of cystic fibrosis

The purpose of the study was to evaluate the short-term effects of population based screening for carriers of cystic fibrosis. The outcome measures included perceptions of health, anxiety, and understanding of test results. Those adults aged between 18 and 45, registered with a general practice in Inner London, who accepted the offer of carrier testing, completed questionnaires before testing, upon receipt of results, and three months later. Full data were obtained from 427 with negative test results and 14 carriers. Receipt of results had no effect upon perceptions of health or perceived risk of having an abnormal baby. Those receiving a positive test result were significantly more anxious upon receipt of this result. By three months, this anxiety had dissipated. While knowledge of the test improved from before to after testing, by three months there was some decay. Although the residual risk among those with a negative result of being a carrier was given as 1:135, at least 17% of those receiving a negative result incorrectly believed that they were at no risk of having a child with cystic fibrosis. Five of the 14 receiving a positive result erroneously believed that their results meant that they probably, but not definitely, carried the gene for cystic fibrosis. In the longer term the greatest problem of population screening would appear to be one of false reassurance rather than anxiety. Longer term studies are needed to determine how well carrier status information is retained, and how carriers and carrier couples plan and respond to pregnancy and how much understanding they retain of their test results.

Counselling following diagnosis of fetal abnormality: a comparison between German, Portuguese and UK geneticists

The principle of non-directiveness in genetic counselling is embraced by all relevant professional bodies. Little is known about the extent to which it is endorsed by geneticists, or incorporated into their clinical practice. The aim of the current study is to document how geneticists in three European countries, Germany, Portugal and the UK, report counselling women at risk for having children with a range of conditions. While geneticists in all three countries reported counselling in a largely non-directive style, this varied both across genetic conditions and between countries. German and Portuguese geneticists were significantly more directive than UK geneticists, although they differed in the way in which they were directive. German geneticists were more likely to encourage continuation of pregnancies, while Portuguese geneticists were more likely to encourage termination of affected pregnancies. There was no strong consensus on approaches to counselling for any of the genetic conditions, defined as agreement between 70% of all three groups of geneticists. Despite strong professional codes of non-directiveness, geneticists report being somewhat directive in some counselling situations. Future research needs to focus on what geneticists are trying to achieve in genetic counselling, how they actually counsel, and with what effects.

Antenatal cystic fibrosis carrier screening--whether, when and how?

Population screening for carriers of cystic fibrosis (CF) is now possible. Such screening may have both advantages and disadvantages and hence must be evaluated before it becomes routine practice. As the potential benefits of screening are wide and the drawbacks may include psychological effects, a combination of approaches is needed to assess screening thoroughly instead of only counting numbers of terminations or carrier tests. We describe the issues concerned and our methodology for a rigorous evaluation of population antenatal carrier screening for cystic fibrosis.

Uptake of cystic fibrosis testing in primary care: supply push or demand pull?

OBJECTIVE

To determine the acceptability and feasibility of screening for carriers of cystic fibrosis in a primary care setting.

DESIGN

Follow up study over 15 months of patients offered carrier testing by mouthwash.

SETTING

A general practice in inner London.

SUBJECTS

5529 patients aged 18-45 invited by various methods and combinations of methods (letter, booklet, personal approach) for testing.

MAIN OUTCOME MEASURES

Uptake of screening, anxiety, and knowledge of test.

RESULTS

957 (17%) invitees were screened over the 15 months. 28 carriers and no carrier couples were detected. Uptake rates were 12% (59/502 patients) among patients invited by letter and tested by appointment; 9% (47/496) among patients invited by letter, with leaflet, and tested by appointment; 4% (128/2953) among patients invited by letter six weeks before the end of the study and tested by appointment; 17% (81/471) among patients offered passive opportunistic testing; 70% (453/649) among patients offered active opportunistic testing; and 25% (22/88) among patients offered active opportunistic testing by appointment. A short term rise in anxiety among those given a positive test result had dissipated by three months. At three months about one fifth and one third of those given positive and negative results respectively did not understand their results correctly.

CONCLUSION

These results suggest that the strongest variable in determining uptake of screening is the active approach by a health professional offering immediate testing. It remains to be resolved whether the high uptake rates achieved by active recruitment indicate a supply push for this new test rather than a demand from the population.

Instructors--a weak link in resuscitation training

One explanation for the well documented poor basic resuscitation skills of health-care professionals is that these skills are not acquired during initial training. The first aim of our study was to assess the basic life-support skills of trainers teaching basic resuscitation. The second aim was to examine the relationship between the trainers' confidence and actual skill. We found that practical basic life-support skills prior to the two-day training course were poor. They were still inadequate after training. Assessments before and after the course showed significant positive correlation between confidence at performing basic life-support and actual skill. There is an urgent need for formal instructor training in the UK. The training programme should be evaluated, as should the performance of both trainers and trainees, to ensure that all have acquired the requisite skills.

General practice based diabetes surveillance: the views of patients

Forty three patients with non-insulin dependent diabetes registered at two suburban practices were interviewed at least one year after the introduction of an organized general practice based system of diabetic surveillance and the results compared with data gathered from interviews administered before the introduction of the system. Structured data from the two interviews were compared in relation to the importance which patients attached to diabetes and its medical review, patients' preference for place of future review and the health professionals from whom they wished to receive diabetes care. Patients' ratings of the performance of health professionals on various aspects of care were compared with the ratings given before the introduction of the new service. At the follow-up interviews the reasons behind patients' responses to the structured questions were explored using a qualitative method. The introduction of a general practice based diabetes service was marked by an improvement in attendance for diabetes monitoring (56% before introduction, 98% in the year following introduction). This was associated with an increase in the importance which patients attached to diabetes and its medical review. After experience of diabetes care in general practice, patients remained enthusiastic about general practice involvement and confident in their general practitioners' knowledge about diabetes management. In spite of an improvement in the patients' ratings of hospital doctors' communication skills, they continued to rate general practitioners significantly more highly in these skills (P < 0.01) and in terms of convenience and accessibility (P < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)

An advanced resuscitation training course for preregistration house officers

Preregistration house officers need to be able to manage the first 5-10 minutes of a cardiac arrest. A course has been designed based on the recommendations of the Resuscitation Council UK 1984 and the format of the American Heart Association advanced cardiac life support course. Fifty-nine newly qualified doctors from the same medical school class were studied in two consecutive groups: Group 1 (n = 31) were commencing their first post and Group 2 (n = 28), whose first preregistration post had been at other hospitals without practical resuscitation training, were commencing their second post. They were pretested and taught in three 2-hour sessions. Five months later they were tested to measure retention of knowledge and skills. Before training there was no difference in knowledge between the two groups but Group 1 were more skilled. The knowledge and skills of both groups immediately after training were significantly improved and at 5 months skills were subject to modest decay only. Experience of managing cardiac arrests was not a substitute for formal practical training.

Diabetes and its care--what do patients expect?

A sample of 77% of the non-insulin dependent diabetics aged 30-70 years from two urban practices offering no structured diabetic care were interviewed. The 55 patients (mean age 60 years) were asked about their experiences and expectations of diabetes and the health professionals involved in their care. Twenty-six patients attended the hospital diabetic clinic regularly but 13 patients received no review at all; 46 patients wanted their general practitioner to be involved in future care and only six wanted to continue with hospital review alone. Patients gave hospital doctors and general practitioners similar high ratings for knowledge of diabetes and its management but general practitioners and practice nurses were rated more highly for communication and accessibility. The aspect of care valued most was being given clear information about diabetic management. Twenty two patients thought that diabetes would have a significant impact on their future health and 35 rated regular diabetic review as extremely important in keeping themselves healthy. Most patients felt it likely that they would have a high blood glucose level most of the time and develop diabetic complications. Little difference was found between the views of clinic attenders and non-attenders, and there was no evidence that non-attenders had actively rejected review. These non-insulin dependent diabetics considered diabetes to be a serious disorder warranting regular care and expressed confidence in the primary care team's ability to provide such care.