A Quantitative Polymerase Chain Reaction Protocol for Sex Identification of Zebra Finch and Chicken Using Blood...

Area of Science:

• Avian biology
• Developmental biology
• Molecular genetics

Background:

• Accurate sex determination is crucial for avian research, often relying on PCR analysis of genomic DNA.
• In birds like zebra finches, females (ZW) possess unique W chromosome sequences, distinguishing them from males (ZZ).
• Single W locus analysis risks misidentification due to genetic variation or technical failures, potentially yielding false male results.

Purpose of the Study:

• To develop a robust method for avian sex determination, reducing false positives.
• To enhance the reliability of sex identification in early-stage avian embryos.
• To validate a novel molecular approach for both zebra finches and chickens.

Main Methods:

• Developed a SYBR-based quantitative PCR assay targeting two distinct W chromosome loci.
• Applied the method to determine the sex of 30 zebra finch embryos at embryonic day 13.
• Confirmed genetic sex through subsequent brain transcriptome sequencing and tested primers in chickens.

Main Results:

• The dual-locus quantitative PCR method accurately identified the sex of zebra finch embryos.
• Transcriptome sequencing validated the genetic sex determined by the PCR assay.
• Effective primer sets for sex determination in chickens were identified and tested.

Conclusions:

• Targeting multiple W loci with quantitative PCR provides a more reliable method for avian sex determination.
• This approach mitigates risks of misidentification associated with single-locus analysis.
• The validated method has potential applications in both research and potentially applied avian science.