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  11. Satellite Dna Mapping In Suliformes (aves): Insights Into The Evolution Of The Multiple Sex Chromosome System In Sula Spp.
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  11. Satellite Dna Mapping In Suliformes (aves): Insights Into The Evolution Of The Multiple Sex Chromosome System In Sula Spp.

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Satellite DNA Mapping in Suliformes (Aves): Insights into the Evolution of the Multiple Sex Chromosome System in Sula spp.

Luciano Cesar Pozzobon1, Natália Dos Santos2, Ricardo Utsunomia2

  • 1Laboratório de Citogenética e Evolução, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre 91509-900, RS, Brazil.

Genes
|June 26, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Repetitive DNA sequences, known as satellite DNAs, show varied patterns across Suliformes birds. This variation, especially in sex chromosomes, suggests a role in karyotype evolution and species diversification.

Keywords:
chromosomal mappingkaryotypic evolutionmultiple sex chromosomessatellite DNA

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Cytogenetics

Background:

  • The order Suliformes displays notable karyotype diversity.
  • The genus *Sula* possesses an uncommon Z1Z1Z2Z2/Z1Z2W multiple-sex chromosome system in avian species.
  • Satellite DNAs (satDNAs) are repetitive sequences that vary significantly, serving as markers for karyotypic and sex chromosome evolution.

Purpose of the Study:

  • To characterize satDNAs in Suliformes species.
  • To investigate the role of satDNAs in the karyotypic evolution of Suliformes.
  • To analyze the influence of satDNAs on sex chromosome differentiation within this avian order.

Main Methods:

  • Characterization of satDNAs in *Sula leucogaster* and *Nannopterum brasilianum* using BGISEQ-500 and bioinformatics.
suliformes
  • Chromosomal mapping of satDNAs via fluorescence in situ hybridization (FISH).
  • FISH analysis was performed on karyotypes of *S. leucogaster*, *N. brasilianum*, *Sula sula*, *Sula dactylatra*, and *Fregata magnificens*.

    • Main Results:

    • Five satDNAs identified in *S. leucogaster*; eight in *N. brasilianum*.
    • Three *Sula* species shared specific satDNA sequences with differing hybridization patterns.
    • *N. brasilianum* exhibited species-specific satDNAs, and Z chromosomes showed reduced repetitive DNA accumulation.

    Conclusions:

    • Differential accumulation of repetitive sequences contributes to karyotype diversification in Suliformes.
    • Repetitive DNA sequences play a role in the structural differentiation of sex chromosomes.
    • SatDNA analysis provides insights into the evolutionary mechanisms shaping avian karyotypes.