mosaic variegated aneuploidy syndrome 1 [DOID:0080141]
A mosaic variegated aneuploidy syndrome that is characterized by slow growth before and after birth, shorter than average height, unusually small head size, and an increased risk of developing cancer in childhood, and that has_material_basis_in homozygous or compound heterozygous mutation in the BUB1B gene on chromosome 15q15.
DNA ligase IV deficiency [DOID:0060021]
A combined T cell and B cell immunodeficiency that has_material_basis_in a mutation in the LIG4 gene, a DNA ligase, encoding a protein essential for V(D)J recombination and DNA double-strand break (DSB) repair through nonhomologous end joining (NHEJ). Patients present with immunodeficiency and developmental and growth delay.