The origin and differentiation process of X and Y chromosomes of the black marsh turtle (Siebenrockiella crassicollis, Geoemydidae, Testudines).
Summary of "The origin and differentiation process of X and Y chromosomes of the black marsh turtle (Siebenrockiella crassicollis, Geoemydidae, Testudines)."
The black marsh turtle (Siebenrockiella crassicollis) has morphologically differentiated X and Y sex chromosomes. To elucidate the origin and evolutionary process of S. crassicollis X and Y chromosomes, we performed cross-species chromosome painting with chromosome-specific DNA from Chinese soft-shelled turtle (Pelodiscus sinensis) and chromosome mapping of the sex-linked genes of S. crassicollis using FISH. The X and Y chromosomes of S. crassicollis were hybridized with DNA probe of P. sinensis chromosome 5, which is homologous to chicken chromosome 5. S. crassicollis homologues of 14 chicken chromosome 5-linked genes were all localized to the X long arm, whereas two genes were mapped to the Y short arm and the other 12 genes were localized to the Y long arm in the same order as the X chromosome. This result suggests that extensive linkage homology has been retained between chicken chromosome 5 and S. crassicollis X and Y chromosomes and that S. crassicollis X and Y chromosomes are at an early stage of sex chromosome differentiation. Comparison of the locations of two site-specific repetitive DNA sequences on the X and Y chromosomes demonstrated that the centromere shift was the result of centromere repositioning, not of pericentric inversion.
Affiliation
Laboratory of Animal Genetics, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
Journal Details
This article was published in the following journal.
Name: Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology
ISSN: 1573-6849
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22183803
- DOI: http://dx.doi.org/10.1007/s10577-011-9267-7
Medical and Biotech [MESH] Definitions
Sex Differentiation
The process in developing sex- or gender-specific tissue, organ, or function after SEX DETERMINATION (GENETICS). Major areas of sex differentiation occur in the reproductive tract (GENITALIA) and the brain.
Cytogenetics
A subdiscipline of genetics which deals with the cytological and molecular analysis of the CHROMOSOMES, and location of the GENES on chromosomes, and the movements of chromosomes during the CELL CYCLE.
Crossing Over, Genetic
The reciprocal exchange of segments at corresponding positions along pairs of homologous CHROMOSOMES by symmetrical breakage and crosswise rejoining forming cross-over sites (HOLLIDAY JUNCTIONS) that are resolved during CHROMOSOME SEGREGATION. Crossing-over typically occurs during MEIOSIS but it may also occur in the absence of meiosis, for example, with bacterial chromosomes, organelle chromosomes, or somatic cell nuclear chromosomes.
Antigens, Differentiation, B-lymphocyte
Membrane antigens associated with maturation stages of B-lymphocytes, often expressed in tumors of B-cell origin.
Chromosomes, Human, Pair 5
One of the two pairs of human chromosomes in the group B class (CHROMOSOMES, HUMAN, 4-5).
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