Chromatin Accessibility Analysis from Fresh and Cryopreserved Human Ovarian Follicles

Area of Science:

• Reproductive Biology
• Genomics
• Epigenetics

Background:

• Gene regulatory elements are crucial for ovarian follicle development, impacting fertility and age-related decline.
• Ovarian tissue cryopreservation and transplantation for fertility preservation often face challenges with graft function.
• Assay for Transposase Accessible Chromatin by sequencing (ATAC-seq) identifies regulatory elements but was optimized for fresh cells.

Purpose of the Study:

• To evaluate the impact of cryopreservation on ATAC-seq data quality from human ovarian follicles.
• To determine if cryopreservation affects the biological interpretability of chromatin accessibility data in ovarian tissue.
• To facilitate the application of ATAC-seq in clinical settings for studying human fertility.

Main Methods:

• Generated matched ATAC-seq datasets from fresh and cryopreserved human ovarian follicles.
• Compared data quality and consistency between fresh and cryopreserved samples.
• Analyzed chromatin accessibility patterns to assess biological interpretation.

Main Results:

• ATAC-seq data from cryopreserved ovarian follicles showed reduced quality compared to fresh samples.
• Despite reduced quality, data from cryopreserved samples remained consistent with fresh samples.
• Cryopreservation did not significantly alter the biological interpretation of chromatin accessibility data.

Conclusions:

• Cryopreservation has a limited impact on the biological interpretation of ATAC-seq data from human ovarian follicles.
• ATAC-seq is a viable method for studying chromatin regulation in cryopreserved ovarian tissue.
• This research supports the use of ATAC-seq to improve understanding of human fertility and ovarian function.