Enlargement of egg size by crispr/cas9-mediated knockout of a sex-linked gene in the silkworm, bombyx mori

Tsuguru Fujii, Yutaka Banno

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ge (giant egg) is a sex-linked mutation in Bombyx mori which leads to the production of large-sized eggs caused by an increase in the number of follicular epithelial cells, each with decreased cell size. We previously determined that a gene orthologous to human Phytanoyl-CoA dioxygenase domain-containing 1 (PHYHD1) is specifically disrupted in Ge and Ge 2 mutants through positional cloning of the Ge locus. However, little is known about the function of the BmPHYHD1 gene in determination of the egg size. In this study, we knocked out BmPHYHD1 using CRISPR/Cas9. We employed a novel knockout protocol developed in other lepidopteran species in which a commercialized Cas9 mixed with two sgRNAs designed for a target gene is injected into newly-laid eggs. First, we confirmed that the protocol was applicable to B. mori with high efficiency. Second, we targeted the BmPHYHD1 gene and obtained G 0 moths laid large size eggs. CRISPR/Cas9-mediated mutations were confirmed in G 1 moths that laid large-sized eggs, demonstrating that the BmPHYHD1 gene controls egg size in B. mori. Finally, the dominant/recessive relationship between Ge and + Ge is discussed and we propose the use of gi (giant egg) and gi 2 (giant egg 2) to represent giant egg mutations, Ge and Ge 2 , respectively. We believe that Ge mutants are an appropriate model for the study of genetic mechanisms mediating the size and number of cells in animals.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalJournal of Insect Biotechnology and Sericology
Volume87
Issue number3
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

sex linkage
Bombyx
Bombyx mori
silkworms
Ovum
Genes
mutation
genes
moths
Eggs
mutants
Clustered Regularly Interspaced Short Palindromic Repeats
Cloning
Moths
molecular cloning
Animals
epithelial cells
Cell Size
Lepidoptera
Gene

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology
  • Business, Management and Accounting(all)
  • Agricultural and Biological Sciences(all)
  • Insect Science
  • Industrial and Manufacturing Engineering

Cite this

Enlargement of egg size by crispr/cas9-mediated knockout of a sex-linked gene in the silkworm, bombyx mori. / Fujii, Tsuguru; Banno, Yutaka.

In: Journal of Insect Biotechnology and Sericology, Vol. 87, No. 3, 01.01.2018, p. 71-78.

Research output: Contribution to journalArticle

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