Karyotype evolution of suliformes and description of a ♂Z1Z1Z2Z2/♀Z1Z2W multiple sex chromosome system in boobies (Sula spp.).

IF 2.3 3区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Genome Pub Date : 2025-01-01 DOI:10.1139/gen-2024-0165
Luciano Cesar Pozzobon, Gustavo Akira Toma, Marcelo de Bello Cioffi, Edivaldo Herculano Corrêa de Oliveira, Rafael Kretschmer, Thales Renato Ochotorena de Freitas
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引用次数: 0

Abstract

Our comprehension of avian karyotypes still needs to be improved, especially for Suliform birds. To enhance understanding of chromosomal evolution in this order, we conducted conventional and molecular cytogenetic analysis in five species, named Sula dactylatra, Sula leucogaster, Sula sula (Sulidae), Fregata magnificens (Fregatidae), and Nannopterum brasilianum (Phalacrocoracidae). The diploid chromosome number for S. dactylatra and S. leucogaster was established as 2n = 76 in males, and 2n = 75 in females, but S. sula displayed a karyotype of 2n = 76 chromosomes in males. The disparity in diploid chromosome numbers between male and female Sula is due to a multiple sex chromosome system of the Z1Z1Z2Z2/Z1Z2W type. We propose that the emergence of this multiple-sex chromosome system resulted from a Robertsonian translocation involving the W chromosome and the smallest microchromosome. Fregata magnificens exhibited a diploid number 76 (2n = 76), while N. brasilianum displayed a diploid number of 74 (2n = 74) in both sexes. The ribosomal cluster was located in one microchromosome pair in S. dactylatra, S. leucogaster, S. sula, and F. magnificens and in four pairs in N. brasilianum. Our findings provide evidence of a conserved multiple-sex chromosome system within the Sula genus, shedding light on the high karyotype diversity in Suliformes.

鲣鸟尾形目核型进化及♂Z1Z1Z2Z2/♀Z1Z2W多性染色体系统描述
我们对鸟类核型的理解还需要进一步提高,特别是对Suliform鸟类。为了加深对这一目的染色体进化的认识,我们对5个物种进行了常规和分子细胞遗传学分析,分别是:dactylatra、S. leucogaster、S. Sula (Sulidae)、Fregata magnificens (Fregata fergatidae)和Nannopterum brasilianum (phalacrocoridae)。结果表明,短叶稻和白腹稻雄性和雌性的二倍体染色体数分别为2n = 76和2n = 75,而雌性的二倍体染色体数为2n = 76。雄性和雌性苏拉二倍体染色体数目的差异是由于Z1Z1Z2Z2/Z1Z2W型的多重性染色体系统造成的。我们提出,这种多性别染色体系统的出现是由于涉及W染色体和最小微染色体的罗伯逊易位。雌雄同体的倍体数分别为76 (2n = 76)和74 (2n = 74)。该核糖体簇分布在短叶仙鹤、白腹仙鹤、苏拉仙鹤和凤尾仙鹤的1对微染色体上,分布在巴西仙鹤的4对微染色体上。我们的发现提供了一个保守的多性染色体系统在苏拉属的证据,揭示了在Suliformes高核型多样性。
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来源期刊
Genome
Genome 生物-生物工程与应用微生物
CiteScore
5.30
自引率
3.20%
发文量
42
审稿时长
6-12 weeks
期刊介绍: Genome is a monthly journal, established in 1959, that publishes original research articles, reviews, mini-reviews, current opinions, and commentaries. Areas of interest include general genetics and genomics, cytogenetics, molecular and evolutionary genetics, developmental genetics, population genetics, phylogenomics, molecular identification, as well as emerging areas such as ecological, comparative, and functional genomics.
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