title: GSM5736241: 3-B-2; Mus musculus; OTHER
library_construction_protocol: 12 male mice of C57BL/6J strain from 4 age groups (3-, 12-, 19- and 22-month-old) were used to extract brains, hearts, livers, bone marrow, PBMCs and sperms. Red cells in bone marrow were removed by Red Blood Cell Lysis Buffer (Beyotime). PBMCs were isolated from blood using Ficoll-Paque PLUS (GE Healthcare). The motile spermatozoa were isolated from the mouse epididymal tail by collecting cells floating in the upper layer of RPMI 1640 (Thermo Fisher Scientific). The isolated tissues were immediately put into liquid nitrogen for quick freezing. The whole organs were cut into small pieces and ground into powder by tissue homogenizer in presence of liquid nitrogen to avoid heating. All ground tissue samples were stored at -80℃ prior to DNA isolation. Genomic DNA from the mouse brain, bone marrow, heart, liver and PBMCs was isolated using TIANamp Genomic DNA kit (Tiangen, DP304) with RNaseA treatment according to the manufacturer's protocols. Genomic DNA from sperm cells was extracted using Sperm DNA Purification Kit (Simgen, 4202050) following the manufacturer's instructions. All DNA samples were eluted in UltraPure™ DNase/RNase-Free Distilled Water (Invitrogen), measured the concentration using SMA6000 (Merinton) and stored at -20℃. SSiNGLe-AP method