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Origin and chromatin remodeling of young X/Y sex chromosomes in catfish with sexual plasticity

National Science Review 2023年第2期10卷 91-106页

作者： Gaorui Gong Yang Xiong Shijun Xiao Xi-Yin Li Peipei Huang Qian Liao Qingqing Han Qiaohong Lin Cheng Dan Li Zhou Fan Ren Qi Zhou Jian-Fang Gui Jie Mei Hubei Hongshan Laboratory College of Fisheries Huazhong Agricultural University Jiaxing Key Laboratory for New Germplasm Breeding of Economic Mycology State Key Laboratory of Freshwater Ecology and Biotechnology Hubei Hongshan Laboratory Institute of HydrobiologyChinese Academy of Sciences University of the Chinese Academy of Sciences School of Animal Science and Nutritional Engineering Wuhan Polytechnic University MOE Laboratory of Biosystems Homeostasis & Protection Life Sciences InstituteZhejiang University

Assembly of a complete Y chromosome is a significant challenge in animals with an XX/XY sex-determination *** cently,we created YY-supermale yellow catfish by crossing XY males with sex-reversed XY females,providing a valuable model for Y-chromosome assembly and ***,we assembled highly homomorphic Y and X chromosomes by sequencing genomes of the YY supermale and XX female in yellow catfish,reve aling their nucleotide divergences with only less than 1% and with the same gene *** sex-determining region(SDR) was identified to locate within a physical distance of0.3 Mb by ***,the incipient sex chromosomes were revealed to originate via autosome-autosome fusion and were characterized by a highly rearranged region with an SDR downstream of the fusion *** found that the Y chromosome was at a very early stage of differentiation,as no clear evidence of evolutionary strata and classical structure features of recombination suppression for a rather late stage of Y-chromosome evolution were ***,a number of sex-antagonistic mutations and the accumulation of repetitive elements were discovered in the SDR,which might be the main driver of the initial establishment of recombination suppression between young X and Y ***,distinct three-dimensional chromatin organizations of the Y and X chromosomes were identified in the YY supermales and XX females,as the X chromosome exhibited denser chromatin structure than the Y chromosome,while they respectively have significantly spatial interactions with female-and male-related genes compared with other *** chromatin configuration of the sex chromosomes as well as the nucleus spatial organization of the XX neomale were remodeled after sex reversal and similar to those in YY supermales,and a male-specific loop containing the SDR was found in the open chromatin *** results elucidate the origin of young sex chromosomes and the chromatin remodel

关键词： Y chromosome sex-chromosome evolution chromosome fusion chromatin organization sexual reversal

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Male heterogametic sex determination in Rana dybowskii based on sex-linked molecular markers

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Integrative Zoology 2022年第1期17卷 105-114页

作者： Yuan XU Zhiheng DU Jiayu LIU Hang SU Fangyong NING Shiquan CUI Lijuan WANG Jianming LIU Chuanshuai REN Shengwei DI Xiujuan BAI College of Animal Science and Technology Northeast Agricultural UniversityHarbinChina College of Life Sciences Northeast Agricultural UniversityHarbinChina College of Agricultural Eastern Liaoning UniversityDandongChina Yili Animal Science Research Institute YiningChina Animal Husbandry Administration of Huadian HuadianChina Branch of Animal Husbandry and Veterinary of Heilongjiang Academy of Agricultural Sciences QiqiharChina

Identifying the mechanism for sex determination in amphibians is *** little is known about sex determination mechanisms of Rana dybowskii,a species of importance to evolutionary and conservation *** screened for sex-linked molecular markers in *** in China using target region amplification polymorphism with 2 fixed primers against the sequences of *** found 2 male-linked molecular markers in ***,which were 222 bp and 261 bp *** detection rates of 222 bp marker in males form Xinglong,Huadian,and Dandong were 93.79%,69.64%,and 13.64%,respectively,while the rate in females from Huadian was 27.50%.Besides,the detection rates of 261 bp marker in the above 3 regions were only observed in males at the rate of 93.79%,87.50%,and 32.73%,*** inheritance patterns of sex-linked molecular markers showed that the 2 sex-linked molecular markers were *** to the XY-male parent,progeny from XX-pseudo-male parent possessed lower sex reversal ratio at the same rearing temperature,and the proportion of female froglets from an XX-pseudo-male parent was more than 95%at low rearing temperature(15°C).Our findings suggest that *** displays male heterogamety,and the 2 sex-linked molecular markers may have a guiding significance for the protection and utilization of ***.

关键词： male-linked molecular markers Rana dybowskii sexual reversal TRAP markers

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