Expression Profile of Chicken Sex Chromosome Gene BTF3 is Linked to Gonadal Phenotype

Sexual Development : Genetics, Molecular Biology, Evolution, Endocrinology, Embryology, and Pathology of Sex Determination and Differentiation
Long LiuMichael Clinton

Abstract

In birds, the female is heterogametic (ZW) and the male homogametic (ZZ). The small W chromosome comprises only 28 protein coding genes (homologues to Z chromosome counterparts) and a number of repeat regions. Here, we report our analysis of one of these genes, BTF3 (basic transcription factor 3), which exhibits differential expression during gonadogenesis. We measured RNA levels of both Z and W homologues and BTF3 protein levels in male and female gonads during development of the chicken embryo. In addition, BTF3 RNA and protein levels were compared in female gonads (ovary) and in female gonads following treatment to induce sex reversal (testis). Combined BTF3 RNA levels were higher in female gonads than male gonads, while BTF3-Z was expressed at similar levels in males and females. Surprisingly, BTF3 protein levels were higher in male gonads than female gonads at embryonic day 6 (E6), suggesting translational rather than transcriptional regulation. BTF3 protein was expressed in both somatic and germ cells and was restricted to the medulla of the developing ovary in females and the sex cords of the developing testis in males. In addition, in gonadal sex-reversed females, RNA and protein levels of BTF3 were similar to those nor...Continue Reading

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Citations

Mar 5, 2021·Proceedings of the National Academy of Sciences of the United States of America·Jason IoannidisMichael Clinton

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