Lissencephaly is a rare, genetically heterogeneous brain malformation caused by impaired neuronal migration during embryogenesis. The condition is characterized by absence or incomplete development of the gyri of the brain cortex, causing a smooth brain surface. Other typical findings include an abnormally thick, poorly organized cortex, postnatal microcephaly, profound mental retardation, severe developmental delay, and seizures. Milder forms are associated with infrequent seizures and intellectual disability.

The lissencephaly and related disorders NGS panel consists of forty-two genes: ACTB, ACTG1, ADGRG1, ARX, ATP6V0A2, B3GALNT2, B4GAT1, CDK5, DAG1, DCX, DYNC1H1, FKRP, FKTN, GMPPB, ISPD, KATNB1, KIF2A, KIF5C, LAMA2, LAMB1, LARGE1, NDE1, PAFAH1B1, POMGNT1, POMGNT2, POMK, POMT1, POMT2, RELN, RXYLT1, SNAP29, SRD5A3, TMTC3, TUBA1A, TUBA8, TUBB, TUBB2A, TUBB2B, TUBB3, TUBG1, VLDLR and WDR62.

Copy number variation (CNV) analysis of the lissencephaly and related disorder genes is also offered as a panel. Additionally, CTGT offers a comprehensive test (both NGS and CNV panels) for these genes. Panel genes are also offered as individual sequencing and deletion/duplication tests, unless otherwise indicated.