Abstract: The composition includes either an isolated protein complex including MCM8 and MCM9 proteins, or nucleic acid molecules coding for the proteins that constitute the complex, or compounds inhibiting the formation and/or the stability, or the activity of the complex, for its use for enhancing or reducing animal, preferably mammal, fertility.

Abstract: An isolated antibody specifically binding the C-terminus part of the MCM9 protein, the C-terminus part of the MCM9 protein is one of the following sequences: the amino acids sequence from the position 391 to the position 1143 of the MCM9 proteins of the sequence as set forth in SEQ ID NO: 2 or 16, or the amino acids sequence from the position 391 to the position 1143 of the MCM9 protein of the sequence as set forth in SEQ ID NO: 8.

Abstract: The composition includes either an isolated protein complex including MCM8 and MCM9 proteins, or nucleic acid molecules coding for the proteins that constitute the complex, or compounds inhibiting the formation and/or the stability, or the activity of the complex, for its use for enhancing or reducing animal, preferably mammal, fertility.

Abstract: An isolated antibody specifically binding the C-terminus part of the MCM9 protein, the C-terminus part of the MCM9 protein is one of the following sequences: the amino acids sequence from the position 391 to the position 1143 of the MCM9 proteins of the sequence as set forth in SEQ ID NO: 2 or 16, or the amino acids sequence from the position 391 to the position 1143 of the MCM9 protein of the sequence as set forth in SEQ ID NO: 8.

Abstract: The use of the human or animal MCM9 gene, or parts of the gene, or transcripts thereof, or antisense nucleic acids able to hybridize with part of the gene or transcripts, or silencing RNA derived from parts of the transcripts and able to repress the MCM9 gene, or proteins or peptidic fragments translated from the transcripts, or antibodies directed against the proteins or peptidic fragments, for the preparation of a pharmaceutical composition for the treatment of a human or animal pathology linked to a dysfunction of the expression of the MCM9 gene, or of human or animal cancers.

Abstract: The use of the human or animal MCM9 gene, or parts of the gene, or transcripts thereof, or antisense nucleic acids able to hybridize with part of the gene or transcripts, or silencing RNA derived from parts of the transcripts and able to repress the MCM9 gene, or proteins or peptidic fragments translated from the transcripts, or antibodies directed against the proteins or peptidic fragments, for the preparation of a pharmaceutical composition for the treatment of a human or animal pathology linked to a dysfunction of the expression of the MCM9 gene, or of human or animal cancers.