Background: Clinical analysis and genetic testing of a family with osteogenesis imperfecta type IV were conducted, aiming to discuss antenatal genetic diagnosis of osteogenesis imperfecta type IV.
Material and Methods: Preliminary genotyping was performed based on clinical characteristics of the family members and then high-throughput sequencing was applied to rapidly and accurately detect the changes in candidate genes.
Results: Genetic testing of the III5 fetus and other family members revealed missense mutation in c.2746G>A, pGly916Arg in COL1A2 gene coding region and missense and synonymous mutation in COL1A1 gene coding region.
Conclusions: Application of antenatal genetic diagnosis provides fast and accurate genetic counseling and eugenics suggestions for patients with osteogenesis imperfecta type IV and their families.

Keywords: Base Sequence, Amino Acid Substitution, Collagen Type I - genetics, DNA - genetics, DNA Mutational Analysis, Extracellular Matrix Proteins - genetics, Female, genetic testing, Genotype, Humans, Male, Molecular Sequence Data, Mutation, Missense, Osteogenesis Imperfecta - genetics, Pedigree, Pregnancy, Prenatal Diagnosis, Silent Mutation