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Vertebrate diapause preserves organisms long term through Polycomb complex members.

ABSTRACT: Diapause is a state of suspended development that helps organisms survive extreme environments. How diapause protects living organisms is largely unknown. Using the African turquoise killifish (Nothobranchius furzeri), we show that diapause preserves complex organisms for extremely long periods of time without trade-offs for subsequent adult growth, fertility, and life span. Transcriptome analyses indicate that diapause is an active state, with dynamic regulation of metabolism and organ development genes. The most up-regulated genes in diapause include Polycomb complex members. The chromatin mark regulated by Polycomb, H3K27me3, is maintained at key developmental genes in diapause, and the Polycomb member CBX7 mediates repression of metabolism and muscle genes in diapause. CBX7 is functionally required for muscle preservation and diapause maintenance. Thus, vertebrate diapause is a state of suspended life that is actively maintained by specific chromatin regulators, and this has implications for long-term organism preservation.

SUBMITTER: Hu CK

PROVIDER: S-EPMC7532943 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Vertebrate diapause preserves organisms long term through Polycomb complex members.

Hu Chi-Kuo CK Wang Wei W Brind'Amour Julie J Singh Param Priya PP Reeves G Adam GA Lorincz Matthew C MC Alvarado Alejandro Sánchez AS Brunet Anne A

Science (New York, N.Y.) 20200201 6480

Diapause is a state of suspended development that helps organisms survive extreme environments. How diapause protects living organisms is largely unknown. Using the African turquoise killifish (<i>Nothobranchius furzeri</i>), we show that diapause preserves complex organisms for extremely long periods of time without trade-offs for subsequent adult growth, fertility, and life span. Transcriptome analyses indicate that diapause is an active state, with dynamic regulation of metabolism and organ d ...[more]

PMID: 32079766

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Project description:Rationale: The decision whether to initiate or forgo long-term ventilation for children can be difficult and impactful. However, little has been published on the informational and decisional needs of families facing this decision.Objectives: To assess what families with children with chronic respiratory failure and life-limiting conditions need and want for informed decision-making.Methods: English- and Spanish-speaking parents who were facing (contemporaneous decision makers) or had previously faced (former decision makers) a decision regarding invasive or noninvasive long-term ventilation for their children were recruited using convenience sampling. Patients who were older and cognitively capable also were invited to participate. We performed semistructured interviews using an open-ended interview guide developed de novo to assess parents' decisional needs and experiences. Qualitative data analysis used a thematic approach based on framework analysis, and thematic saturation was a goal.Results: A sample of 44 parents and 2 patients from 43 families was interviewed. All contemporaneous decision makers (n = 28) favored or believed that they would choose long-term ventilation. Fifteen of 16 former decision makers chose long-term ventilation. Thematic saturation was achieved from the perspective of parents who favored or chose long-term ventilation. Four domains were identified: parents' emotional and psychological experiences with decision-making, parents' informational needs, parents' communication and decision support needs, and parents' views on the option not to initiate long-term ventilation. For most parents, making a decision regarding long-term ventilation was stressful, even though they articulated goals and values that could/did guide their decision-making. In general, parents wanted comprehensive information, including what life would be like at home for the child and the family. They wanted their medical providers to be honest, tactful, patient, and supportive. Parents reported that they felt being presented with the option not to initiate was acceptable.Conclusions: In this study, we identified specific informational and decision-making needs regarding long-term ventilation that parents facing decisions feel are important. These data suggest that providers should present families with comprehensive, balanced information on the impact of long-term ventilation and, when the child has a profoundly serious and life-limiting condition, explore the option not to initiate long-term ventilation.

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Vertebrate diapause preserves organisms long term through Polycomb complex members.

Publications

Vertebrate diapause preserves organisms long term through Polycomb complex members.

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