In somatic cells, DNA is normally wrapped around the histones
octamer to forms nucleosomes that eventually give rise to a
solenoid DNA structure. Unlike somatic cells, in mammalian sperm,
the development of spermatids into mature spermatozoa is
accomplished by a series of structural and chemical modifications
including a gradual replacement of lysine-rich histones by
transition proteins and then by protamines which bind more tightly
to DNA than histones, which results in compaction of chromatin in
the sperm nucleus, a process which is termed 'sperm chromatin
condensation'. This book examines the several techniques that have
been devised in order to study chromatin and DNA defects in human
spermatozoa.
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