Mol Biol Cell. Expression was detectable in females red but not in males blue. Hamburger and Hamilton HH stage 1 blastoderms were taken, and any showing developed primitive streaks were discarded.
This study uses RNA sequencing to examine the degree of cell autonomous sexual differentiation in birds and to characterise the W transcriptome in chicken embryos. We note that this mirrors the overall magnitude of failures to achieve adult ecdysis Materials and methods.
Thus, no clone was generally a much better performer than other members of the same form. However, a potential role for the W sex chromosome in avian sex determination cannot yet be excluded. A similar trend was observed in the E4.
Fraser JA Heitman J. Statistical methods for detecting molecular adaptation. Euphytica— However, this is very likely an underestimation, with many other well-differentiated or even nascent sex chromosome systems still awaiting their discovery, especially when taking into account that homomorphic i.
In a broader context, handful of studies have provided direct evidence that the emergence of sex chromosomes, or even the sex chromosome turnover itself, might play a major role in reproductive isolation promoting evolutionary divergences and eventually speciation e. More sex chromosomes than autosomes in the Amazonian frog Leptodactylus pentadactylus.
Trends Ecol Evol 15 : —
Those genes upregulated in the gonads Figure 1D and Additional file 4 are therefore interesting candidate gonadal sexual differentiation genes. Mutational divergence of life-history traits in an obligate parthenogen. Therefore it is possible that additional Z-linked genes may play a role in sexual differentiation in different tissues through changes in their relative expression.
These findings show that different sexually dimorphic molecular pathways are engaged by the sex chromosomes in the two different tissues examined here.