Zhou Q.,Biofuture Research Group |
Zhou Q.,Central China Normal University |
Braasch I.,Biofuture Research Group |
Froschauer A.,Biofuture Research Group |
And 8 more authors.
Journal of Genetics and Genomics | Year: 2010
A consensus sequence, encoding a putative DNA polymerase type B derived from a Polinton transposon, was assembled from the sex determination region of Xiphophorus maculatus. This predicted protein, which is 1,158 aa in length, contains a DNA_pol_B_2 domain and a DTDS motif. The DNA polymerase type B gene has about 10 copies in the haploid X. maculatus genome with one Y-specific copy. Interestingly, it has specific copies on the W chromosome in the X. maculatus Usumacinta strain (sex determination with female heterogamety), which represent new markers for this type of sex chromosome in platyfish. This marker with W- and Y-specific copies suggests relationship between different types of gonosomes and allows comparing male and female heterogameties in the platyfish. Further molecular analysis of the DNA polymerase type B gene in X. maculatus will shed new light on the evolution of sex chromosomes in platyfish. © 2010 Institute of Genetics and Developmental Biology and the Genetics Society of China.