Stratification of Fabry mutations in clinical practice: a closer look at α-galactosidase A-3D structure

BACKGROUND

Fabry disease (FD) is an X-linked lysosomal storage and multi-system disorder due to mutations in the α-galactosidase A (α-GalA) gene. We investigated the impact of individual amino acid exchanges in the α-GalA 3D-structure on the clinical phenotype of FD patients.

PATIENTS AND METHODS

We enrolled 80 adult FD patients with α-GalA missense mutations and stratified them into three groups based on the amino acid exchange location in the α-GalA 3D-structure: patients with active site mutations, buried mutations and other mutations. Patient subgroups were deep phenotyped for clinical and laboratory parameters and FD-specific treatment.

RESULTS

Patients with active site or buried mutations showed a severe phenotype with multi-organ involvement and early disease manifestation. Patients with other mutations had a milder phenotype with less organ impairment and later disease onset. α-GalA activity was lower in patients with active site or buried mutations than in those with other mutations (P < 0.01 in men; P < 0.05 in women) whilst lyso-Gb3 levels were higher (P < 0.01 in men; <0.05 in women).

CONCLUSIONS

The type of amino acid exchange location in the α-GalA 3D-structure determines disease severity and temporal course of symptom onset. Patient stratification using this parameter may become a useful tool in the management of FD patients.

Glucosylceramide synthase inhibition with lucerastat lowers globotriaosylceramide and lysosome staining in cultured fibroblasts from Fabry patients with different mutation types

Fabry disease is an X-linked lysosomal storage disorder caused by mutations in the GLA gene coding for α-galactosidase A (α-GalA). The deleterious mutations lead to accumulation of α-GalA substrates, including globotriaosylceramide (Gb3) and globotriaosylsphingosine. Progressive glycolipid storage results in cellular dysfunction, leading to organ damage and clinical disease, i.e. neuropathic pain, impaired renal function and cardiomyopathy. Many Fabry patients are treated by bi-weekly intravenous infusions of replacement enzyme. While the only available oral therapy is an α-GalA chaperone, which is indicated for a limited number of patients with specific 'amenable' mutations. Lucerastat is an orally bioavailable inhibitor of glucosylceramide synthase (GCS) that is in late stage clinical development for Fabry disease. Here we investigated the ability of lucerastat to lower Gb3, globotriaosylsphingosine and lysosomal staining in cultured fibroblasts from 15 different Fabry patients. Patients' cells included 13 different pathogenic variants, with 13 cell lines harboring GLA mutations associated with the classic disease phenotype. Lucerastat dose dependently reduced Gb3 in all cell lines. For 13 cell lines the Gb3 data could be fit to an IC50 curve, giving a median IC50 [interquartile range (IQR)] = 11 μM (8.2-18); the median percent reduction (IQR) in Gb3 was 77% (70-83). Lucerastat treatment also dose dependently reduced LysoTracker Red staining of acidic compartments. Lucerastat's effects in the cell lines were compared to those with current treatments-agalsidase alfa and migalastat. Consequently, the GCS inhibitor lucerastat provides a viable mechanism to reduce Gb3 accumulation and lysosome volume, suitable for all Fabry patients regardless of genotype.

[Identification and economic evaluation of anesthesiologic secondary diagnoses on the basis of intraoperative medication]

BACKGROUND

Complications and comorbidities are encodable in the German diagnosis related groups (G-DRG) system and can improve revenues. In this study, secondary diagnoses were identified through drug administrations during anaesthesia and were economically evaluated by regrouping these cases.

METHODS

All intraoperative drug administrations from 2008 were extracted from a database. After exclusion of synonyms and procedure-specific drug administrations, all remaining drugs were matched to explicit secondary diagnoses. All cases were regrouped with their newly defined secondary diagnoses by G‑DRG grouper software, and changes in cost weight were evaluated.

RESULTS

A total of 29 drugs could be assigned to 18 secondary diagnoses. From 22,440 anaesthesia the § 21 data record could be extracted in 1,929 cases and was regrouped with 2,976 secondary diagnoses, according to additional proceeds of 125,330.25 € in 2008 and 103,542.35 € in 2014. Intraoperative secondary diagnoses influence cost weight only in small parts. The average increase in revenue in this study could have been about 50 € per case. From 2008 to 2014 secondary diagnoses were continuously devaluated, although some of them, e. g. afibrinogenemia, have were revaluated.

DISCUSSION

Our retrospective method of making a diagnosis and assuming a correct indication of drug administration is inapplicable to daily routine. The anaesthesiologic documentation has to make drug administration and thereby the secondary diagnosis plausible.

Outcome findings from a multidisciplinary clinic for children with epilepsy

Children with chronic or intractable epilepsy are at higher risk for medical and social difficulties. A multidisciplinary clinic was established to improve medical management and address psychosocial issues. The purposes of the present study were to describe the multidisciplinary clinic, retrospectively examine the referral patterns for children served by the clinic, and analyze factors significantly predictive of parental satisfaction with the multidisciplinary approach. The Epilepsy Clinic Satisfaction Questionnaire was sent to all patients seen in the clinic over a 2-year period. Outcome findings were based on 136 respondents. A stepwise regression analysis indicated that the best predictor of parental rating of clinic quality was the amount of information given concerning the diagnosis and treatment of epilepsy. Staff attitude was also significantly related to parental satisfaction.

Children's color trails

Color Trails for Children was developed in response to the need for instruments which minimize cultural bias in neuropsychological testing. The test, similar in format to Trail Making, was designed to provide an evaluation of speeded visuomotor tracking while minimizing the influence of language. The present research involves two exploratory studies which examine the relationship between Color Trails for Children and Trail Making, factors that may affect performance times, and discriminant validity. Results indicate that the tests appear to measure the same neuropsychological domains, and administration of Trail Making did not significantly alter performance times on Color Trails. Increasing age and IQ were related to quicker completion time for both tests. Females were found to complete Color Trails 2 and Trail Making Part B more quickly than males in this sample. Comparison between children diagnosed with learning disabilities, attention deficits, or mild neurological conditions and a preliminary standardization sample supported the discriminant validity of Color Traits to distinguish between normal controls and children with altered neuropsychological functioning. Comparison between clinical conditions indicated that Color Trails 2 was particularly sensitive in discriminating among the groups. Although further research is needed, results suggest that Color Trails has the potential to be an effective research and clinical tool in child neuropsychological assessment.

Consumers' awareness of barrier protection in dentistry

Because of the scarcity of printed educational material available to the oral healthcare consumer regarding barrier protection in the dental office, four students at the Fones School of Dental Hygiene conducted a senior project that hypothesized that dental health consumers are poorly informed about barrier protection. Data received from a questionnaire were analyzed to determine the participants' awareness of barrier protection in the dental care setting; specifically, the use of masks, gloves, and protective eyewear. Of the 400 participants, 72% reported that their dentist wore gloves. Of the 321 participants who indicated that their dentist employs a dental hygienist, 76% reported that the dental hygienist wears gloves. And of the 334 participants who indicated that their dentist employs a dental assistant, 65% reported that their dental assistant wears gloves. The percentage of participants who reported the use of protective eyewear and masks is lower. Survey participants who visited offices where dental hygienists and dental assistants are employed were more likely to notice the dentist wearing a mask, gloves, and protective eyewear. Eighty-nine percent of the participants replied that they knew why masks, gloves, and protective eyewear should be worn in the dental setting; 40% replied that they would like more information.

Rethinking what it means to specialize in mft at the master's level

There has been an increase in specialization programs that offer an introduction to marital and family therapy at the master's level. These programs are often referred to as major, minor, track, sequence, or area of emphasis. They typically consist of one or two theory/overview courses housed within a traditional counseling/therapy department. This paper discusses some of the problems with this model and then offers an alternative that attempts to improve conceptual integration and skill development. The alternative model discussed is an interdisciplinary three-course sequence in family assessment concepts and skills. Course descriptions and objectives are provided and discussed.