TBX6 and Mayer-Rokitansky-Kuster-Hauser syndrome: Furthermore, in some patients with fusion anomalies of the MDs such as uterus didelphis, the same causes as for MRKH syndrome, e.g. deletions in 17q12, duplications of chromosomal region 22q11.21, and variants in WNT9B, TBX6 and RBM8A have been described, suggesting that Müllerian fusion anomalies and MRKH syndrome might have a partially common aetiology [22, 43, 48].