Related Experiment Video
Updated: Apr 28, 2026
05:36
Author Spotlight: Advancing Gene Silencing Research in Silkworms with dsRNA Delivery Through Feeding Chitosan Nanoparticles
Published on: October 4, 2024
2.2K
Differences in Pigment Content and Expression of Cocoon Color Formation-Related Genes in Multiple Silkworm Strains
Lin Zhu1, Mengli Li1, Zijian Huang1
1Jiangsu Key Laboratory of Sericultural and Animal Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
Insects
|April 27, 2026
Summary
This study reveals how silkworms produce different cocoon colors by examining pigment content, gene expression, and gene structure. Key genes like CBP and UGT86 play crucial roles in pigment deposition in the middle silk gland.
Area of Science:
- * Genetics and Molecular Biology
- * Biochemistry and Metabolism
- * Sericulture and Entomology
Background:
- * Natural cocoon coloration in Bombyx mori is vital for sustainable sericulture.
- * Understanding the genetic and molecular basis of diverse cocoon colors is essential.
Purpose of the Study:
- * To investigate the coloration mechanism of natural-colored silkworm cocoons.
- * To analyze pigment content, gene expression, and gene structure variations across different silkworm strains.
Main Methods:
- * Comparative analysis of pigment content in 14 silkworm strains.
- * Gene expression profiling of key pigment-related genes.
- * Investigation of gene structural variations, including transcription start sites.
Main Results:
- * Pigment accumulation is tissue-specific and strain-specific, primarily in the middle silk gland (MSG).
- * Yellow/red cocoons show high carotenoid levels, while green cocoons have abundant flavonoids in the MSG.
- * Expression of CBP and UGT86 genes correlates with pigment localization and cocoon color.
Conclusions:
- * The CBP gene regulates carotenoid transport, with variations affecting cocoon color.
- * The UGT86 gene is crucial for flavonoid accumulation in green cocoons.
- * This study provides insights into the genetic basis of diverse cocoon colors in Bombyx mori.
Related Concept Videos
01:39Epistasis
37.2K
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
37.2K
02:27Background and Environment Affect Phenotype
5.8K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
5.8K
02:32Position-effect Variegation
5.6K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
5.6K
01:33Pleiotropy
31.2K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
31.2K
00:49Complementation Tests
4.9K
A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
4.9K
01:09Epistasis Analysis
4.9K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
4.9K