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Read the latest from GENETICS Early Online

Independent Origin of XY and ZW Sex Determination Mechanisms in Mosquitofish Sister Species [Genetics of Sex]

Fish are known for the outstanding variety of their sex determination mechanisms and sex chromosome systems. The western (Gambusia affinis) and eastern mosquitofish (G. holbrooki) are sister species for which different sex determination mechanisms have been described: ZZ/ZW for G. affinis and XX/XY for G. holbrooki. Here, we carried out restriction-site associated DNA (RAD-) and pool sequencing (Pool-seq) to characterize the sex chromosomes of both species. We found that the ZW chromosomes of G. affinis...

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by Kottler, V. A., Feron, R.,...

Gene Knock-Ins in Drosophila Using Homology-Independent Insertion of Universal Donor Plasmids [Investigation]

Targeted genomic knock-ins are a valuable tool to probe gene function. However, knock-in methods involving homology-directed repair (HDR) can be laborious. Here, we adapt the mammalian CRISPaint homology-independent knock-in method for Drosophila melanogaster, which uses CRISPR/Cas9 and non-homologous end joining (NHEJ) to insert universal donor plasmids into the genome. Using this method in cultured S2R+ cells, we efficiently tagged four endogenous proteins with the bright fluorescent protein mNeonGreen, thereby demonstrating that an existing collection of...

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by Bosch, J. A., Colbeth, R.,...

Fine-Mapping Complex Inversion Breakpoints and Investigating Somatic Pairing in the Anopheles gambiae Species Complex Using Proximity-Ligation Sequencing [Investigation]

Chromosomal inversions are fundamental drivers of genome evolution. In the main Afrotropical malaria vector species, belonging to the Anopheles gambiae species complex, inversions play an important role in local adaptation and have a rich history of cytological study. Despite the importance and ubiquity of some chromosomal inversions across the species complex, inversion breakpoints are often challenging to map molecularly due to the presence of large repetitive regions. Here, we develop an approach that uses Hi-C...

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by Corbett-Detig, R. B., Said, I.,...