Orange Cats and the Genetic Switch: The Arhgap36 Discovery
Explore the breakthrough discovery of the Arhgap36 gene and how a unique deletion mutation on the X chromosome determines the iconic color of orange tabby cats.
Best quote from Orange Cats and the Genetic Switch: The Arhgap36 Discovery
The orange trait is actually caused by a 'deletion mutation' in an unexpected place—a 5-kilobase chunk of DNA that acts like a regulatory switch, forcing the hair to be orange by systematically shutting down the ability to be black.
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Let's talk about orange cats and black cats. Are they generally gender specific and are black cats really red?
Frequently Asked Questions
The orange coat color is tied to the X chromosome, a fact known to scientists since 1961. Because males have only one X chromosome, they only need one copy of the orange variant to display the color. This genetic link explains the common observation that orange tabbies are predominantly male, while female cats require two copies of the gene to be fully orange.
Researchers recently identified that the orange trait in cats is caused by a specific genetic switch involving the Arhgap36 gene. In late 2024 and early 2025, two independent research teams discovered that a 5-kilobase deletion mutation in a non-coding region of this gene is responsible for the pumpkin hue. This discovery solved a century-old mystery regarding the exact location of the orange gene.
Modern feline DNA sequencing revealed that the orange trait is not a traditional mutation, such as a swapped letter in the DNA code. Instead, it is a deletion mutation where a 5-kilobase chunk of DNA is missing from a specific region. This unique genetic structure made it difficult for scientists to locate the gene until recent technological advancements allowed them to pin down the Arhgap36 discovery.
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From Columbia University alumni built in San Francisco
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
