Pluripotent stem cell-specific imprinted genes identified using human uniparental-induced pluripotent stem cells

Area of Science:

• Epigenetics
• Developmental Biology
• Genomics

Background:

• Genomic imprinting, an epigenetic process, dictates parent-of-origin gene expression, vital for mammalian development.
• Disruptions in imprinted genes are linked to developmental disorders and diseases.
• Identifying novel imprinted differentially methylated regions (DMRs) is crucial for understanding imprinting's role in human health.

Purpose of the Study:

• To identify novel imprinted DMRs in human cells.
• To utilize parthenogenetic and androgenetic human induced pluripotent stem cells (PgHiPSCs and AgHiPSCs) for discovery.
• To investigate imprinting patterns specific to pluripotent stem cells.

Main Methods:

• Genome-wide DNA methylation profiling using DNA methyl-capture sequencing (MethylCap-seq).
• Validation of candidate imprinted DMRs via bisulfite sequencing.
• Comparative methylation and expression analyses in various cell types.

Main Results:

• Identification of 26 novel imprinted DMRs, with 20 validated after rigorous exclusion criteria.
• Confirmation of distinct imprinted methylation and expression patterns for DOCK4 and LYNX1 DMRs.
• Demonstration of pluripotency-specific imprinting absent in fibroblasts and adult tissues.

Conclusions:

• Uniparental iPSCs are effective tools for discovering imprinted genes in the pluripotent state.
• The identified DMRs provide insights into the epigenetic regulation of early human development.
• This research advances the understanding of genomic imprinting and its implications for developmental disorders.