Abstract
The fundamental molecular control of primary sex determination in higher vertebrates and in certain invertebrates is vested in morphologically distinct sex chromosomes, which are largely heterochromatic and rich in highly repetitive DNA. Snakes in particular provide unique opportunities to elucidate the mechanism involved in the evolution and function of these chromosomes as they offer a model system representing all stages in the evolution of sex chromosomes. Our discovery of sex chromosome associated highly conserved Bkm (Banded krait minor satellite DNA) DNA sequences made the beginning of our understanding of the molecular basis of sex determination. Recently a gene termed SRY was discovered and described as the testis determining factor (TDF). However, the absence of SRY and apparently all other Y sequences in majority of XX males, true XX hermaphrodites, and their presence in most of XY females with no detectable SRY mutation, hitherto remains unexplained. Our recent finding of a unique case of 47 XXY sex reversal with a typical female phenotype having a normal Y chromosome and the normal SRY, SOX9 and ZFY genes, strongly suggests the involvement of other sex determining gene(s) in the complex pathway of sex determination. By using the Bkm probe, we have isolated a novel gene (pß2) from a human testis cDNA library, which is present in both the sexes but is expressed specifically in the male (testis) irrespective of the nature of heterogamety (XX/XY or ZZ/ZW). It is also expressed in male mouse embryos at the onset of testis differentiation. These and other studies suggest that pß2 may be involved in the complex pathway of sex determination. The sex determining chromosomes (W/Y) remain condensed in all somatic cells but decondense extensively in the germ cells. We have identified and purified a sex and tissue-specific Bkm-binding protein (BBP) from snake oocytes which shows sex, tissue and developmental stage specific expression and is associated with the decondensed state of the sex determining chromosomes (Y/W). We have implicated the BBP in bringing about co-ordinated decondensation of the entire W/Y chromosome by binding to GATA repeats, which may serve as a switch for the activation of the genes present on these chromosomes. We have isolated sex and species specific repetitive DNA from mouse (M34) and human (102(d)2) which are distributed along the length of the Y-chromosome. These are expressed specifically in the testis in a developmentally regulated manner in the cell type which shows decondensation of the Y-chromosome.
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Singh, L., Pathak, N.H., Rachel, A.J., Thangaraj, K. (1999). Snakes’s Eyeview of Adam and Eve. In: Gupta, S.K. (eds) Reproductive Immunology. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4197-0_13
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DOI: https://doi.org/10.1007/978-94-011-4197-0_13
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