cDNA sequencing increases the molecular diagnostic yield in Chediak-Higashi syndrome.

Chediak-Higashi syndrome (CHS) is rare autosomal recessive disorder caused by bi-allelic variants in the Lysosomal Trafficking Regulator () gene. Diagnosis is established by the detection of pathogenic variants in in combination with clinical evidence of disease. Conventional molecular genetic testing of by genomic DNA (gDNA) Sanger sequencing detects the majority of pathogenic variants, but some remain undetected for several individuals clinically diagnosed with CHS.

Diagnosis of Chediak Higashi disease in a 67-year old woman.

Chediak-Higashi disease is a rare disease caused by bi-allelic mutations in the lysosomal trafficking regulator gene, LYST. Individuals typically present in early childhood with partial oculocutaneous albinism, a bleeding diathesis, recurrent infections secondary to immune dysfunction, and risk of developing hemophagocytic lymphohistiocytosis (HLH). Without intervention, mortality is high in the first decade of life.