<unk>  typically occurs with the presence of ectodermal dysplasia, which is a group of disorders where two or more ectodermally derived structures will have abnormal development. In the rare case that ectodermal dysplasia is not associated or present,<unk>  will be caused by an unknown genetic mutation. Although no specific gene has been identified, there have been many different genes found to be associated with<unk>  including EDA, EDAR, and EDARADD genes. Other genes such as MSX1, PAX9, IRF6, GREM2, AXIN2, LRP6, SMOC2, LTBP3, PITX2, and WNT10B. The WNT10A gene is considered to be the major gene involved in hypodontia and oligodontia. These genes are involved in hypodontia and oligodontia. If<unk>  is present in the maternal or paternal side, the chances of this being inherited are increased.
Anodontia
Hypodontia
Maxillary hypoplasia
Hemifacial microsomia
Micrognathism
Macrodontia 
Oxycephaly
Iniencephaly