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Home Health&Beauty

What makes us human? It’s all in the hips

by The FINANCIAL News
October 1, 2022
in Health&Beauty
0
New WHO report on Human T-lymphotropic virus type 1 highlights strategies for its prevention and control
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New study shows how pelvis evolved for walking upright, allowing birth of offspring with larger brains. If evolutionary biologist Terence D. Capellini were to rank the body parts that make us quintessentially human, the pelvis would be near the top.

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After all, its design makes it possible for humans to walk upright on two legs (unlike our primate cousins), and it makes it possible for mothers to give birth to babies with heads big enough to accommodate large brains. On an anatomical level, the pelvis is well understood, but relatively little is known about exactly how and when it takes shape in a developing fetus.

A new study from Capellini’s lab is changing that. Published in Science Advances, the work shows the developmental point at which the pelvis takes shape and identifies the genes and genetic sequences that orchestrate the process. The work may one day help shed light on the genetic origin of bipedalism and open the door to treatments or predictors of hip joint disorders, such as hip dysplasia and hip osteoarthritis.

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“This paper is really focused on what all humans share, which are these changes to the pelvis that allowed us to walk on two legs and allowed us to give birth to a large fetal head,” said Capellini, a newly tenured professor in the Department of Human Evolutionary Biology and senior author on the study.

The study shows that many of these features form around the 6- to 8-week mark during pregnancy. This includes key pelvic features unique to humans, like its curved and basin-like shape. At this point bones are still cartilage so they can easily curve, rotate, expand, and grow.

The researchers also saw that as other cartilage in the body began to turn into bone this developing pelvic section remained cartilage longer, giving it time to develop its distinctive shape.

“There appears to be a stalling that happens, and this stalling allows the cartilage to still grow, which was pretty interesting to find and surprising,” Capellini said. “I call it a zone of protection.”

The researchers performed RNA sequencing to show which genes in the region are triggering the formation of the pelvis and stalling ossification. They identified hundreds of genes that are turned on or off during the 6- to 8-week mark to form the ilium in the pelvis, the largest and uppermost bone of the hip, with blade-like structures that curve and rotate into a basin to support walking on two legs.

Compared with chimpanzees and gorillas, the shorter and wider orientation of our pelvic blades allow humans to walk and balance upright without having to shift weight forward and use our knuckles for stability and balance. It also helps increase the size of the birth canal.

Researchers started the study by comparing these differences in hundreds of skeletal samples of humans, chimpanzees, and gorillas. The comparisons demonstrated the striking effects that natural selection has had on the human pelvis, the ilium in particular.

To see when the ilium and pelvic elements forming the birth canal began to take shape, the researchers examined 4- to 12-week-old embryos under a microscope with the consent of people who had legally terminated their pregnancies. The researchers then compared samples from the developing human pelvis with mouse models to identify the on and off switches triggering the formation.

The work was led by Mariel Young, a former graduate researcher in Capellini’s lab who finished her Ph.D. in 2021. The study was a collaboration between Capellini’s lab and 11 other labs in the U.S. and around the world. Ultimately, the group wants to see what these changes mean for common hip diseases.

“Walking on two legs affected our pelvic shape, which affects our disease risk later,” Capellini said. “We want to reveal that mechanism. Why does selection on the pelvis affect our later disease risk of the hip, like osteoarthritis or dysplasia? Making those connections at the molecular level will be critical.”

Juan Siliezar

Tags: Humanpelvis
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