For Sexually Confused Chickens, The Answer Is in Their Cells

By Andrew Moseman | March 11, 2010 10:40 am

ConfusedChickenThe technical way to explain this odd-looking fowl is that it’s “gynandromorphous.” But if you just want to call it “one seriously confused chicken,” that works, too.

For a new study in Nature, Michael Clinton and colleagues investigated a few of these half-male, half-female chickens they obtained from chicken farms. Gynandropmorphs show up now and then not just in chickens, but also in parrots, pigeons, and some other kinds of animals. But scientists weren’t sure how the mix-up happens, since the standard idea for sex differentiation is that the sex hormones released by the gonads either masculinize or feminize the embryo. Clinton’s team discovered that bird cells don’t need to be programmed by hormones. Instead they are inherently male or female, and remain so even if they end up mixed together in the same chicken [BBC News].

The researchers had first assumed that the half-and-half chickens followed the hormone pattern, and that they were females with some sort of chromosomal problem on the male side (the lighter half of the bird in the image, which also sports a large wattle, sturdy breast musculature, and a leg spur on its male side). Instead, they found the chickens to be almost perfectly split between male and female. The hen half was, for the most part, made up of normal female cells with female chromosomes, whereas the cockerel side contained mostly normal male cells with male chromosomes [Nature News].

Since both sides experienced the same hormone exposure, that couldn’t explain what was happening. In addition, once the team believed that cell identity was at work here, and not hormones, further experiments seemed to confirm this idea. When the researchers transplanted tissues from genetically female embryos into what would become the gonads of genetically male ones and vice versa, the transplanted cells didn’t start expressing opposite-sex characteristics [Science News].

Clinton’s study is buttressed by others that suggest the standard explanation for sex determination doesn’t apply as widely as previously thought, or at least needs some tweaking. Besides the other birds mentioned previously, some marsupials and invertebrates stray from the pattern. “These funky chickens, oddities of nature that they are, will provide new perspectives on questions of sexual identity long thought to have been resolved,” wrote Duke University cell biologists Lindsey Barske and Blanche Capel in a Nature commentary accompanying the findings [Wired.com].

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Image: The Roslin Institute at the University of Edinburgh

CATEGORIZED UNDER: Living World
  • Geoffrey Frasz

    Since no one else seems to have said it yet, in print or blogs anyway, I propose that we refer to this condition in chickens as “half-cocked.”

  • http://google Jacobi

    If you wake up with a dingdong and you look in the mirror daily, how can you be so confused about your sex? You can’t say you were born that way, and you definitly can’t say you didn’t pick that sex. When your father and mother concieved you, there were millions of your brothers and sisters running around to get to that egg, but you beat them to it, they in terms died. But you went on and made a baby, now that you have a dong, or a coochie, how must you be confused, or how must you confused the world? I don’t like she-males, nor gay, nor lesbians, nor he-females, I love what I was created for woman, not man. I am not confused, I thought I had a problem, I don’t, I just had a V8.

  • William

    I think, Jacobi, this is addressing physical condition, not behavioral or emotional conditions. That, I’m afraid, is a whole other ball of beeswax.

  • Brian

    Jacobi. Perhaps male and female cells in your brain are responsible for the irrelevant rant that you have graced this page with.

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