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Sesquizygotic twinning: a unique twinning type rather than mechanism

Published online by Cambridge University Press:  13 May 2025

Yuge Tan Open the ORCID record for Yuge Tan [Opens in a new window]
Yuge Tan*
Affiliation:
Zhejiang University, Hangzhou, 310058 China
*
Corresponding author: Yuge Tan; Email: 282422769@qq.com
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Abstract

Sesquizygotic twinning (SZT) is one of the rarest events that can occur in multiple pregnancies. It has only been reported twice to date. Studies indicate that sesquizygotic twins result from the splitting of a chimeric embryo at an early stage. Theories and studies suggest that SZT represents a third unique twinning mechanism that is different from dizygotic and monozygotic twinning; however, the unique features of SZT have nothing to do with the twinning mechanism. Instead, it resembles more of an atypical monozygotic twinning form according to the twinning mechanism.

Keywords

Chimeric embryosdiploidizationdispermic fertilizationmultiple pregnanciesparthenogenetic activation

Information

Type
Short Communication
Information
Zygote , Volume 33 , Issue 2 , April 2025 , pp. 114 - 116
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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