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An X-linked sex determination mechanism in cannabis and hop

by Stansell, Zachary , McKay, John K , Osmanski, Austin , Marcus, Zach E , Clevenger, Josh , Guerrero, Rafael F , Muehlbauer, Gary J , Korani, Walid , Lovell, John T , Hale, Haley , Stack, George , Meharg, Zachary , Bentz, Philip C , Allsing, Nicholas , Harkess, Alex , Vergara, Daniela , Mangels, Jack , McCoy, Hannah , Lynch, Ryan C , Fletcher, Rich , Grimwood, Jane , Michael, Todd P , Havill, Joshua S , Smart, Lawrence B , Orozco, Leonardo R , Kane, Nolan C , Carey, Sarah B , Padgitt-Cobb, Lillian , Akozbek, Laramie M , Myers, Zack A , Gordon, Tyler , Easterling, Katherine A

in Evolutionary Biology

2025

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An X-linked sex determination mechanism in cannabis and hop

in Evolutionary Biology

2025

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An X-linked sex determination mechanism in cannabis and hop

in Evolutionary Biology

2025

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Journal Article

An X-linked sex determination mechanism in cannabis and hop

Stansell, Zachary,

McKay, John K,

Osmanski, Austin,

Marcus, Zach E,

Clevenger, Josh,

Guerrero, Rafael F,

Muehlbauer, Gary J,

Korani, Walid,

Lovell, John T,

Hale, Haley,

Stack, George,

Meharg, Zachary,

Bentz, Philip C,

Allsing, Nicholas,

Harkess, Alex,

Vergara, Daniela,

Mangels, Jack,

McCoy, Hannah,

Lynch, Ryan C,

Fletcher, Rich,

Grimwood, Jane,

Michael, Todd P,

Havill, Joshua S,

Smart, Lawrence B,

Orozco, Leonardo R,

Kane, Nolan C,

Carey, Sarah B,

Padgitt-Cobb, Lillian,

Akozbek, Laramie M,

Myers, Zack A,

Gordon, Tyler,

Easterling, Katherine A

2025

Overview

Sex chromosomes in cannabis and hop were identified a century ago because of their obvious visible differences in size (heteromorphy). However, we know little about the genes they contain that control the development of the inflorescences. Here we assembled genomes, with phased sex chromosomes, for hop and cannabis. The XY chromosomes share an origin prior to the divergence between the genera >36 MYA. Due to the inheritance patterns of the XYs, the male-specific region of the Y is highly-degenerated, with substantial gene loss, while the X shows faster rates of molecular evolution. Consistent with the theory that these species lack an active-Y system, no clear sex-determining genes reside on the Y. Instead, an X-linked homolog of aminocyclopropane-1-carboxylate synthase ( ), that is involved in the ethylene biosynthesis pathway, determines the fate of the female inflorescence. Beyond sex determination, the sex chromosomes contribute to the sexual dimorphism in ecology and physiology and have played a role in the domestication and breeding of these species.

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Publisher

Cold Spring Harbor Laboratory

Subject

Evolutionary Biology