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Epistasis Analysis

Epistasis Analysis

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...

Epistasis

Epistasis

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...

Position-effect Variegation

Position-effect Variegation

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.

Background and Environment Affect Phenotype

Background and Environment Affect Phenotype

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...

Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

Inheritance of Chromatin Structures

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...

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Maintaining Biological Cultures and Measuring Gene Expression in Aphis nerii: A Non-model System for Plant-insect Interactions

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Aphids: a model for polyphenism and epigenetics.

Dayalan G Srinivasan¹, Jennifer A Brisson

¹Department of Biological Sciences, Rowan University, Glassboro, NJ 08028, USA.

Genetics Research International

|May 9, 2012

Summary

This summary is machine-generated.

Aphids exhibit epigenetic inheritance, where environmental cues alter offspring development. Research is uncovering the molecular basis of this epigenetic plasticity in aphids, establishing them as a key model organism.

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Area of Science:

* Epigenetics and Evolutionary Biology
* Molecular basis of phenotypic plasticity

Background:

* Environmental factors influence organismal traits across generations.
* Aphids demonstrate epigenetic inheritance, altering offspring development via parental signals.
* Aphids are a model organism for studying phenotypic plasticity.

Purpose of the Study:

* To review epigenetic phenomena in aphids.
* To explore the molecular basis and evolutionary origins of epigenetic inheritance in aphids.
* To highlight aphids as a model for studying molecular epigenetics in polyphenisms.

Main Methods:

* Review of existing literature on aphid epigenetics.
* Analysis of genomic data, including the pea aphid genome sequence.
* Leveraging new and ongoing genomics projects in aphids.

Main Results:

* Discovery of a functional DNA methylation system in aphids.
* Identification of a functional small RNA system in aphids.
* Characterization of an expanded set of chromatin modifying genes.

Conclusions:

* Aphids possess key molecular machinery for epigenetic inheritance.
* These discoveries provide a foundation for studying aphid plasticity.
* Aphids are an emerging model for molecular epigenetics research in polyphenisms.