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The eukaryotic genome is folded into higher-order conformation accompanied with constrained dynamics for coordinated genome functions. However, the molecular machinery underlying these hierarchically organized three-dimensional (3D) chromatin architecture and dynamics remains poorly understood. Here by combining imaging and sequencing, we studied the role of lamin B1 in chromatin architecture and dynamics. We found that lamin B1 depletion leads to detachment of lamina-associated domains (LADs) from the nuclear periphery accompanied with global chromatin redistribution and decompaction. Consequently, the inter-chromosomal as well as inter-compartment interactions are increased, but the structure of topologically associating domains (TADs) is not affected. Using live-cell genomic loci tracking, we further proved that depletion of lamin B1 leads to increased chromatin dynamics, owing to chromatin decompaction and redistribution toward nucleoplasm. Taken together, our data suggest that lamin B1 and chromatin interactions at the nuclear periphery promote LAD maintenance, chromatin compaction, genomic compartmentalization into chromosome territories and A/B compartments and confine chromatin dynamics, supporting their crucial roles in chromatin higher-order structure and chromatin dynamics.
Asunto(s)
Humanos , Cromatina , Cromosomas , Genoma , Lamina Tipo B/genéticaRESUMEN
@#Objective To compare the di-syllabic tone between hearing-impaired children and normal-hearing children. Methods 120 hearing-impaired children and 36 normal-hearing children aged 3~5 years were asked to read aloud 32 word with 16 kinds of di-syllabic tone. Results All the normal-hearing children read all the words correctly, and the hearing-impaired children faulted in pronouncing as their peers. The correct incidence improved in 4-year old hearing-impaired children compared with that of the 3-year old, but it was not significant different between the 4- and the 5- year old. There was not significant difference of the high and level tone between the hearing-impaired children and normal-hearing children. However, the rising, falling- rising and falling tones were significantly different between the two groups. Conclusion The hearing-impaired children aged 3~5 years delay to speech words with di-syllabic tone, especially for those with rising, falling-rising and falling tones.
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Objective:In order to study the morphological diversification in heterotopic liver auxiliary transplantation(HLAT). Methods:HLAT model in rats was established, the status of rats survival and graft function was evaluated postoperatively by rheometer, SPECT electrical microscope etc. Results:Rat HLAT model was feasible, the operative success rate was 93.3%, one week postoperative survival rate was 80%,the survival time without complications was more than 3 months. The function of the native liver was not affected, as the time goes by, the graft become atrophic after 45 days postoperatively. Conclusion:In HLAT model, the function of the native liver was not affected, 45-days-after the transplantation, the graft become atrophic.
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Objective To expound emphatically the application of nuclear medical examination in primary hyperparathyroidism.Methods 22 patients (19 adenomas,3 hyperplasia) with primary hyperparathyroidism confirmed by clinical examination and surgery underwent the detection of parathormone (PTH) by immunoradiometric assay (IRMA) and double phase 99 Tcm-MIBI parathyroid imaging,of whom 15 performed 99 TcmO-4 thyroid imaging and 8 99 Tcm-MDP bone imaging.Results The level of serum PTH in all patients (428.21±256.48) was significantly higher as compared to normal value and in cases with adenomas (781.83±194.56) was markedly elevated.The sensitivity of 99 Tcm-MIBI early and delayed phase imaging in detecting lesions of parathyroid adenomas was 84.2% and 100%,respectively.The sensitivity in detecting lesions of hyperplasia was only 33.3%.With 99 Tcm-O-4 thryoid imaging,the cold nodules were present in 2 and normality in 13.As to bone imaging,the scans were abnormal in 7.Their severities on bone scintigraph were correlated with the duration of the disease.Conclusions The level of serum PTH detected by IRMA and double phase 99 Tcm-MIBI parathyroid imaging are both sensitive methods in qualitative diagnosis and localization of hyperthyroidism.99Tcm-MIBI imaging has limited value for detecting the hyperplasia.The thyroid and bone imaging may well improve the diagnostic sensitivity and accuracy,and reflect the stage and progress of hyperparathyroidism.