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2.
Biochim Biophys Acta Gene Regul Mech ; 1865(5): 194848, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-35905858

RESUMEN

Histone modifying enzymes are involved in the posttranslational modification of histones and the epigenetic control of gene expression. They play a critical role in normal development, and there is increasing evidence of their role in developmental disorders (DDs). DDs are a group of chronic, severe conditions that impact the physical, intellectual, language and/or behavioral development of an individual. There are very few treatment options available for DDs such that these are conditions with significant unmet clinical need. Recessive variants in the gene encoding histone modifying enzyme KDM5B are associated with a DD characterized by developmental delay, facial dysmorphism and camptodactyly. KDM5B is responsible for the demethylation of lysine 4 on the amino tail of histone 3 and plays a vital role in normal development and regulating cell differentiation. This review explores the literature on KDM5B and what is currently known about its roles in development and developmental disorders.


Asunto(s)
Histonas , Histona Demetilasas con Dominio de Jumonji , Niño , Discapacidades del Desarrollo/genética , Histonas/genética , Histonas/metabolismo , Humanos , Histona Demetilasas con Dominio de Jumonji/genética , Histona Demetilasas con Dominio de Jumonji/metabolismo , Proteínas Nucleares/metabolismo , Proteínas Represoras/metabolismo
3.
Cell Rep Med ; 3(6): 100541, 2022 06 21.
Artículo en Inglés | MEDLINE | ID: mdl-35732148

RESUMEN

The chemotherapy resistance of esophageal adenocarcinomas (EACs) is underpinned by cancer cell extrinsic mechanisms of the tumor microenvironment (TME). We demonstrate that, by targeting the tumor-promoting functions of the predominant TME cell type, cancer-associated fibroblasts (CAFs) with phosphodiesterase type 5 inhibitors (PDE5i), we can enhance the efficacy of standard-of-care chemotherapy. In ex vivo conditions, PDE5i prevent the transdifferentiation of normal fibroblasts to CAF and abolish the tumor-promoting function of established EAC CAFs. Using shotgun proteomics and single-cell RNA-seq, we reveal PDE5i-specific regulation of pathways related to fibroblast activation and tumor promotion. Finally, we confirm the efficacy of PDE5i in combination with chemotherapy in close-to-patient and in vivo PDX-based model systems. These findings demonstrate that CAFs drive chemotherapy resistance in EACs and can be targeted by repurposing PDE5i, a safe and well-tolerated class of drug administered to millions of patients world-wide to treat erectile dysfunction.


Asunto(s)
Adenocarcinoma , Fibroblastos Asociados al Cáncer , Neoplasias Esofágicas , Adenocarcinoma/tratamiento farmacológico , Fibroblastos Asociados al Cáncer/metabolismo , Neoplasias Esofágicas/tratamiento farmacológico , Humanos , Masculino , Inhibidores de Fosfodiesterasa 5/farmacología , Microambiente Tumoral
4.
Biotechniques ; 72(3): 104-109, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-35152705

RESUMEN

Single-nuclei RNA sequencing allows single cell-based analysis in frozen tissue, ameliorating cell recovery biases associated with enzymatic dissociation methods. The authors present two optimized methods for isolating and sequencing nuclei from esophageal tissue using a commercial EZ and citric acid (CA)-based method. Despite high endogenous RNase activity, these protocols produced libraries of expected fragment length (average length EZ: 745 bp; CA: 1232 bp) with comparable complexity (median Transcript/Gene number, EZ: 496/254; CA: 483/256). CA nuclei showed a higher proportion of ribosomal gene reads, potentially reflecting co-isolation of nuclei and adherent ribosomes. The authors identified 11 cell lineages in the combined datasets, with differences in cell type recovery between the two methods, providing utility dependent on experimental needs.


Asunto(s)
Núcleo Celular , Perfilación de la Expresión Génica , Núcleo Celular/genética , Perfilación de la Expresión Génica/métodos , Secuenciación de Nucleótidos de Alto Rendimiento/métodos , Análisis de Secuencia de ARN/métodos , Transcriptoma
5.
Lab Chip ; 21(17): 3378-3386, 2021 09 07.
Artículo en Inglés | MEDLINE | ID: mdl-34240097

RESUMEN

The future of single cell diversity screens involves ever-larger sample sizes, dictating the need for higher throughput methods with low analytical noise to accurately describe the nature of the cellular system. Current approaches are limited by the Poisson statistic, requiring dilute cell suspensions and associated losses in throughput. In this contribution, we apply Dean entrainment to both cell and bead inputs, defining different volume packets to effect efficient co-encapsulation. Volume ratio scaling was explored to identify optimal conditions. This enabled the co-encapsulation of single cells with reporter beads at rates of ∼1 million cells per hour, while increasing assay signal-to-noise with cell multiplet rates of ∼2.5% and capturing ∼70% of cells. The method, called Pirouette coupling, extends our capacity to investigate biological systems.


Asunto(s)
Bioensayo , Análisis de la Célula Individual , Ruido
6.
Foods ; 9(4)2020 Mar 26.
Artículo en Inglés | MEDLINE | ID: mdl-32224958

RESUMEN

Tea provides health benefits, while oxidation is part of tea processing. The effect of oxidation on the antithrombotic properties of tea lipid extracts was evaluated for the first time. Total lipids (TL) extracted from fresh tea leaves and commercial tea powder, before and after 30-60 min of oxidation, were further fractionated into neutral lipids (NL) and polar lipids (PL). The antithrombotic bioactivities of tea TL, PL, and NL were assessed in human platelets against the inflammatory mediator platelet-activating factor. PL were further assessed against thrombin, collagen, and adenosine diphosphate, while their fatty acid composition was evaluated by GC-MS. PL exhibited the strongest antithrombotic effects against all platelet agonists and were rich in omega-3 polyunsaturated (ω3 PUFA) and monounsaturated (MUFA) fatty acids. A decline was observed in the antithrombotic activities, against all platelet agonists tested, for PL after 60 min of oxidation, and on their MUFA content, while their overall ω3 PUFA content and ω6/ω3 ratio remained unaffected. A synergistic effect between tea phenolic compounds and PL protects them against oxidation, which seems to be the rational for retaining the antithrombotic biofunctionalities of PL at a considerable favorable cardioprotective level, even after 60 min of tea oxidation. More studies are required to elucidate the mechanisms of the favorable synergism in tea PL extracts.

7.
Lab Chip ; 19(22): 3771-3775, 2019 11 21.
Artículo en Inglés | MEDLINE | ID: mdl-31608915

RESUMEN

Particle sedimentation is deleterious to a tremendous variety of microfluidic applications. Using an open instrumentation approach we show that syringe rotation retains particles in a suspended state, providing a universal solution for the continuous delivery of particulate samples to microfluidic processors.

8.
Hydrobiologia ; 832(1): 257-268, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-30880834

RESUMEN

Hybridization between introduced and indigenous species can lead to loss of unique genetic resources and precipitate extinction. In Tanzania, the Nile tilapia (Oreochromis niloticus) and blue-spotted tilapia (Oreochromis leucostictus) have been widely introduced to non-native habitats for aquaculture and development of capture fisheries. Here, we aimed to quantify interspecific hybridization between these introduced species and the indigenous species Oreochromis esculentus, Oreochromis jipe and Oreochromis korogwe. In the Pangani basin, several hybrids were observed (O. niloticus × O. jipe, O. leucostictus × O. jipe, O. niloticus × O. korogwe), although hybrids were relatively uncommon within samples relative to purebreds. Hybrids between the native O. jipe × O. korogwe were also observed. In the Lake Victoria basin, no evidence of hybrids was found. Analysis of body shape using geometric morphometrics suggested that although purebreds could be discriminated from one another, hybrids could not be readily identified on body and head shape alone. These results provide the first evidence of hybridization between the introduced species and the Critically Endangered O. jipe in Tanzania. Given uncertainty regarding benefits of introduced species over large-bodied indigenous species in aquaculture and capture fisheries, we suggest that future introductions of hybridization-prone species should be carefully evaluated.

9.
Conserv Genet ; 19(5): 1199-1209, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30363773

RESUMEN

Among the many negative impacts of invasive species, hybridization with indigenous species has increasingly become recognized as a major issue. However, relatively few studies have characterized the phenotypic outcomes of hybridization following biological invasions. Here we investigate the genetic and morphological consequences of stocking invasive tilapia species in two water bodies in central Tanzania. We sampled individuals from the Mindu Reservoir on the Ruvu river system, and at Kidatu on the Great Ruaha-Rufiji river system. We screened individuals at 16 microsatellite loci, and quantified morphology using geometric morphometrics and linear measurements. In both the Mindu and Kidatu systems, we identified evidence of hybridization between indigenous Wami tilapia (Oreochromis urolepis) and the introduced Nile tilapia (Oreochromis niloticus) or blue-spotted tilapia (Oreochromis leucostictus). At both sites, purebred individuals could largely be separated using geometric morphometric variables, with hybrids occupying a broad morphospace among the parental species. Our data demonstrate that the gene pools and phenotypic identity of the indigenous O. urolepis have been severely impacted by the stocking of the invasive species. Given the lack of evidence for clear commercial benefits from stocking invasive tilapia species in waters already populated by indigenous congenerics, we suggest further spread of introduced species should be undertaken with considerable caution.

10.
Soc Work Health Care ; 53(5): 503-17, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24835092

RESUMEN

This tool is a unique comprehensive scale and methodology to measure the psychosocial acuity of patients and families across a health care continuum. Coupled with other measures, psychosocial acuity can tell a complete and compelling story of social work contributions and aid in resource alignment. Accurately conveying the full scope of social work value to anyone, especially health system leadership, requires that the psychosocial acuity of the patient and family be measured and factored into the equation, along with productivity, time spent, and services provided. The development and utilization of the Psychosocial Acuity Tool is the focus of this publication.


Asunto(s)
Familia/psicología , Pacientes/psicología , Indicadores de Calidad de la Atención de Salud , Servicio Social/normas , Estado de Salud , Vivienda , Renta , Salud Mental , Grupo de Atención al Paciente/normas , Calidad de la Atención de Salud/normas , Reproducibilidad de los Resultados , Apoyo Social , Servicio Social/métodos , Encuestas y Cuestionarios , Transportes
11.
J Genet Couns ; 23(5): 725-33, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-24763861

RESUMEN

Amyotrophic lateral sclerosis (ALS) and Huntington disease (HD) are generally considered to be distinct and easily differentiated neurologic conditions. However, there are case reports of the co-occurrence of ALS with HD. We present a 57-year-old male with a clinical diagnosis of sporadic ALS in the context of a family history of HD. This case adds to the limited literature regarding individuals with a family history of HD who present with features of ALS. There were several genetic counseling challenges in counseling this patient including the diagnostic consideration of two fatal conditions, complex risk information, the personal and familial implications, and the patient's inability to communicate verbally or through writing due to disease progression. DNA banking effectively preserved the right of our patient and his wife not to learn his HD genetic status during a stressful time of disease progression while providing the option for family members to learn this information in the future if desired. We present lessons learned and considerations for other clinical genetics professionals who are presented with similar challenging issues.


Asunto(s)
Esclerosis Amiotrófica Lateral/complicaciones , Asesoramiento Genético , Enfermedad de Huntington/complicaciones , Esclerosis Amiotrófica Lateral/genética , Femenino , Humanos , Enfermedad de Huntington/genética , Masculino , Anamnesis , Persona de Mediana Edad , Linaje
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