Developmental impact on trans-acting dosage effects in maize aneuploids

Area of Science:

• Plant genetics
• Molecular biology
• Developmental biology

Background:

• Aneuploidy, an abnormal chromosome number, can lead to reduced vigor and viability.
• This reduction may stem from trans-acting dosage effects impacting gene expression.
• Understanding these molecular and developmental parameters is crucial for studying aneuploid syndromes.

Purpose of the Study:

• To investigate the molecular and developmental effects of aneuploidy on gene expression in maize.
• To analyze the expression patterns of sucrose synthase1 (sus1) and shrunken1 (sh1) in aneuploid plants.
• To compare gene expression changes in different tissues and developmental stages.

Main Methods:

• Examined gene expression of sucrose synthase1 (sus1) and shrunken1 (sh1) in 2-week-old maize plants.
• Utilized a series of maize aneuploid lines with varying chromosome arm numbers (1-3 doses).
• Compared RNA levels in aneuploid tissues to euploid controls and previous embryo/endosperm data.

Main Results:

• Both sus1 and sh1 transcripts exhibited diurnal variation in euploids.
• Most of the 14 aneuploid dosage series altered sus1 and sh1 RNA levels in a gene- and tissue-specific manner.
• Aneuploidy caused greater RNA level modulation in 2-week-old plant tissue compared to embryo and endosperm.

Conclusions:

• Aneuploidy induces gene-specific and tissue-specific changes in gene expression.
• The molecular consequences of aneuploidy appear to intensify as plant development progresses.
• These findings highlight the complex relationship between chromosome dosage and gene regulation during development.