Essential for normal spermatogenesis and male fertility. Required for proper cell restructuring and DNA condensation during the elongation phase of spermiogenesis. Involved in the histone-protamine transition of sperm chromatin and the subsequent production of functional sperm. Binds both double-stranded and single-stranded DNA, ATP and protamine-1 .
H1 histone family, member N, testis-specific; H1FNT; H1T2, HANP1; HANP1; Haploid germ cell-specific nuclear protein 1; Histone H1t2; testis secretory sperm-binding protein Li 223n; Testis-specific H1 histone