Analysis of chromosome karyotype and genome size in echiuran Urechis unicinctus Drasche, 1880 (Polychaeta, Urechidae)

Abstract

Karyotype and genome size are two primary cytogenetic characteristics of species, which are of great significance to the study of cytogenetics, taxonomy, phylogenesis, evolution as well as molecular biology. However, this basic cytogenetic information in echiurans is lacking. Therefore, we analyzed characteristics of karyotype and genome size in the echiuran worm Urechisunicinctus Drasche, 1880. In this study, coelomic cells of U.unicinctus were used for analyzing the genome size by a flow cytometry with chicken erythrocytes as DNA standard, and the 2C DNA content was determined to be 1.85 pg, which was corresponded to the genome size of 904.58 Mbp approximately. Furthermore, trochophores of U.unicinctus were dissociated and cells were utilized for preparing the chromosomes stained with DAPI, and the karyotype was determined as 2n = 30 (10m + 6sm + 6st + 8t), FN=52. Our data provided the basic cytogenetic information of U.unicinctus, which could be utilized in taxonomic study and whole-genome sequencing in future.

Analisis Kromosom Varietas Kacang Gude (Cajanus cajan (L.) Millspaugh) Asal Pulau Kisar, Maluku Barat Daya (MBD)

“…Zayed & Zeinab (2016) menjelaskan bahwa jumlah, ukuran dan bentuk kromosom merupakan komponen dalam mengkarakterisasi kariotipe dan mendefinisikan perbedaan taksonomi. Qin et al (2019) menambahkan bahwa ukuran genom merupakan karakteristik sitogenetik utama dari suatu spesies yang sangat penting diketahui untuk studi sitogenetika, taksonomi, filogenesis, evolusi serta biologi molekuler.…”