Optimizing protocols for microRNA profiling of infant and toddler stool

Area of Science:

• Biochemistry
• Molecular Biology
• Pediatric Research

Background:

• MicroRNA (miRNA) profiling in infant and toddler stool is gaining interest.
• No prior studies have compared protocols for preserving and extracting miRNAs from this specific sample type.

Purpose of the Study:

• To compare the efficacy of different commercial kits and preservation methods for RNA extraction from infant/toddler stool.
• To determine the optimal protocol for high-quality RNA and reliable miRNA profiling in young children.

Main Methods:

• Evaluated three commercial RNA extraction kits and four preservation methods using stool from children under two years old.
• Assessed RNA quality using RNA Quality Number (RQN).
• Performed miRNA sequencing (miRNA-seq) to compare miRNA profiles from the best-performing preservation methods.

Main Results:

• The Zymo BIOMICs kit yielded the highest RNA Quality Number (RQN).
• RNAlater and Zymo DNA/RNA Shield Faecal Collection Tubes provided the highest RQNs and did not significantly differ.
• miRNA sequencing revealed no significant differences in human miRNA profiles between RNAlater and Zymo Shield preservation methods.

Conclusions:

• Collecting infant/toddler stool in RNAlater or Zymo DNA/RNA Shield tubes, combined with the Zymo BIOMICs extraction kit, produces high-quality RNA.
• These methods result in comparable human miRNA profiles, making them suitable for infant miRNA studies.