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A mouse testicular cDNA library in XgtlO was screened with a human H3 gene probe. A recombinant phage with a 5 kb insert was isolated. It contains two histone coding sequences (H2A and H3.1, 1.75 kb apart, same orientation) and begins immediately upstream of the H2A coding sequence. Since both sequences show consensus 3' elements and since the H3 gene is preceded by CCAAT and TATA motifs (consensus elements underlined), we conclude that the insert DNA represents a genomic fragment copurified with mRNA and inserted into the vector. The deduced H3 sequence shows the H3.1 subtype (cys*). Another mouse H3.1 with identical amino acid sequence has been described 1 kb downstream of a (partially sequenced) H2A gene (1), which differs at positions 99 (arg replaces lys) and 126 (pro/ala) from the H2A described here. Thus,the newly described genes belong to a different histone gene cluster.

Nucleotide sequences of mouse histone genes H2A and H3.1