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Ribosomes are highly sophisticated translation machines that have been demonstrated to be heterogeneous in the regulation of protein synthesis1,2. Male germ cell development involves complex translational regulation during sperm formation3. However, it remains unclear whether translation during sperm formation is performed by a specific ribosome. Here we report a ribosome with a specialized nascent polypeptide exit tunnel, RibosomeST, that is assembled with the male germ-cell-specific protein RPL39L, the paralogue of core ribosome (RibosomeCore) protein RPL39. Deletion of RibosomeSTin mice causes defective sperm formation, resulting in substantially reduced fertility. Our comparison of single-particle cryo-electron microscopy structures of ribosomes from mouse kidneys and testes indicates that RibosomeSTfeatures a ribosomal polypeptide exit tunnel of distinct size and charge states compared with RibosomeCore. RibosomeSTpredominantly cotranslationally regulates the folding of a subset of male germ-cell-specific proteins that are essential for the formation of sperm. Moreover, we found that specialized functions of RibosomeSTwere not replaceable by RibosomeCore. Taken together, identification of this sperm-specific ribosome should greatly expand our understanding of ribosome function and tissue-specific regulation of protein expression pattern in mammals.

The success of sustainability is mainly linked to the energy sector, which is governed by the mix of different fuel resources. This work aims to calculate the sustainability performance scores (SPSs) of the energy alternatives that constitute Pakistan’s current electric energy mix and future energy plans. For this purpose, a decision framework consisting of eighteen indicators is considered for evaluating the performance of energy alternatives. The SPSs of energy alternatives are calculated using the dimensional reduction feature of the principal component analysis technique. The resultant prioritization of energy alternatives favors solar resource the most for planning a roadmap for sustainable net-zero energy infrastructure development. Based on the outcomes, recommendations are put forward to improve the current energy situation so that the country could catch the pathway towards achieving energy sustainability.

BackgroundInterstitial lung disease (ILD) and pulmonary sarcoidosis are common respiratory diseases with a heterogeneous distribution worldwide. The global burden and temporal trends of ILD and sarcoidosis are rarely explored.MethodsUsing the classification ‘ILD and pulmonary sarcoidosis’ from the Global Burden of Disease 2019 dataset, we described the age-standardised rates of incidence, mortality, disability-adjusted life-years (DALYs), and their average annual percentage change from 1990 to 2019 by sex, Sociodemographic Index (SDI) and region.ResultsIn 2019, the global incidence and mortality of ILD and pulmonary sarcoidosis were 24.2 million and 169 833 cases, respectively. From 1990 to 2019, the global incidence, deaths and DALYs due to ILD and pulmonary sarcoidosis increased by 118.6%, 166.63% and 122.87% respectively. The global incidence of ILD and pulmonary sarcoidosis was higher in men and was mainly concentrated among persons aged 70‐79 of both sexes. Significant regional differences could be seen in the disease burden of ILD and pulmonary sarcoidosis: since 2006, high-SDI regions had higher age-standardised incidence rates but lower age-standardised death rates compared with the low-SDI regions.ConclusionsOur study suggests the incidence, mortality and DALYs from ILD and pulmonary sarcoidosis are increasing globally. To reduce the ongoing burden of this condition, early diagnosis and treatment are vital, and more targeted and specific strategies should be established in high-burden regions. Differences in incidence and mortality across regions may reflect the influence of genetic, environmental, diagnostic, pharmacotherapeutic, and health system factors.

Achieving the 17 United Nations sustainable development goals (SDGs) in China largely depends on the transition of cities toward sustainable development. However, significant knowledge gaps exist in evaluating the SDG index at the city scale and in understanding how to simulate pathways to achieve the 17 SDGs for Chinese cities by 2030. This study aimed to quantify the SDG index of 285 Chinese cities and developed a forecasting model to simulate the performance of each SDG in each city until 2030 using varied scenarios. The results indicated that although the SDG index in Chinese cities increased by 33.97% during 2005–2016, Chinese cities, which continued their past paths, achieved an average of only five SDGs by 2030. To promote the joint achievement of all SDGs, we designed different paths for all SDGs of each of the 285 cities and simulated their SDG index until 2030. Under the scenarios, 216 Chinese cities (75.79%) could achieve 9–13 more SDGs in 2030 and the overall SDG index can improve from 74.57 in 2030 to 97.49 (target score 100) by adopting more intensive path adjustment. We lastly determined a cost-effective path for each SDG of each city to promote joint achievement of all SDGs by 2030. The proposed simulation model and cost-effective path serve as a foundation for other countries to simulate SDG progress and develop pathways for achieving SDGs in the future.