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Related Concept Videos

Complementation Tests00:49

Complementation Tests

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...
Monohybrid Crosses01:20

Monohybrid Crosses

Overview
Epistasis01:39

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...
Epistasis Analysis01:09

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...

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Related Experiment Video

Updated: Jun 6, 2026

Use of Arabidopsis eceriferum Mutants to Explore Plant Cuticle Biosynthesis
11:02

Use of Arabidopsis eceriferum Mutants to Explore Plant Cuticle Biosynthesis

Published on: May 31, 2008

Two differentially expressed MATE factor genes from apple complement the Arabidopsis transparent testa12 mutant.

S Frank1, M Keck, M Sagasser

  • 1Bielefeld University, Department of Biology, Genome Research, Bielefeld, Germany.

Plant Biology (Stuttgart, Germany)
|December 15, 2010
PubMed
Summary

Researchers identified two key genes, MdMATE1 and MdMATE2, in apples that are crucial for accumulating proanthocyanidins (PAs). These findings advance our understanding of flavonoid transport and can help improve apple

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Area of Science:

  • Plant biochemistry and genetics
  • Flavonoid metabolism and transport

Background:

  • Proanthocyanidins (PAs) are vital flavonoids in plants, offering protection and health benefits in humans and livestock.
  • Apple (Malus x domestica Borkh.) cultivars exhibit significant variation in flavonoid content, impacting nutritional value.
  • Understanding PA accumulation mechanisms in apples is crucial for enhancing their health benefits.

Purpose of the Study:

  • To identify and characterize genes involved in proanthocyanidin (PA) accumulation in apples (Malus x domestica Borkh.).
  • To investigate the function of apple homologues of the TRANSPARENT TESTA12 (TT12) gene from Arabidopsis thaliana in PA transport.
  • To elucidate the role of specific Multidrug And Toxic compound Extrusion (MATE) genes in vacuolar PA transport in apple fruit.

Main Methods:

  • Comparative genomics to identify functional homologues of Arabidopsis thaliana TT12 in apple.
  • Gene expression analysis (differential expression) of identified apple MATE genes (MdMATE1 and MdMATE2).
  • Functional verification of MdMATE proteins by complementation assays in Arabidopsis thaliana mutants.

Main Results:

  • Identified and characterized two apple MATE genes, MdMATE1 and MdMATE2, as functional homologues of Arabidopsis TT12.
  • MdMATE1 and MdMATE2 exhibit differential expression patterns in apple.
  • Functional complementation confirmed MdMATE1 and MdMATE2 encode vacuolar flavonoid/H(+) -antiporters involved in PA accumulation in apple fruit cells.

Conclusions:

  • MdMATE1 and MdMATE2 are proposed as key vacuolar transporters responsible for proanthocyanidin accumulation in apple fruit.
  • The distinct gene structure of MdMATE genes compared to homologues in other species highlights unique aspects of apple flavonoid transport.
  • This research provides foundational knowledge for improving the nutritional quality of apples and derived products through targeted genetic strategies.