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Family-Based Next-Generation Sequencing Study Identifies an IL2RG Variant in an Infant with Primary Immunodeficiency.


ABSTRACT: Primary immunodeficiencies (PIDs) are a rare and heterogeneous group of inherited genetic disorders that are characterized by an absent or impaired immune system. In this report, we describe the use of next-generation sequencing to investigate a male infant with clinical and immunological manifestations suggestive of a PID. Whole-exome sequencing of the infant along with his parents revealed a novel nucleotide variant (cytosine to adenine substitution at nucleotide position 252) in the coding region of the interleukin 2 receptor subunit gamma (IL2RG) gene. The mother was found to be a carrier. These findings are consistent with a diagnosis of X-linked severe combined immunodeficiency and represent the first such reported mutation in an Indian family. This mutation leads to an asparagine to lysine substitution ( p.Asn84Lys ) located in the extracellular domain of IL2RG, which is predicted to be pathogenic. Our study demonstrates the power of next-generation sequencing in identifying potential causative mutations to enable accurate clinical diagnosis, prenatal screening, and carrier female detection in PID patients. We believe that this approach, which is not a current routine in clinical practice, will become a mainstream component of individualized medicine in the near future.

SUBMITTER: Bandari AK 

PROVIDER: S-EPMC6534087 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Family-Based Next-Generation Sequencing Study Identifies an <i>IL2RG</i> Variant in an Infant with Primary Immunodeficiency.

Bandari Aravind K AK   Bhat Sunil S   Archana M V MV   Yadavalli Sunita S   Patel Krishna K   Rajagopalan Pavithra P   Madugundu Anil K AK   Madkaikar Manisha M   Reddy Kavita K   Muthusamy Babylakshmi B   Pandey Akhilesh A  

Omics : a journal of integrative biology 20190501 5


Primary immunodeficiencies (PIDs) are a rare and heterogeneous group of inherited genetic disorders that are characterized by an absent or impaired immune system. In this report, we describe the use of next-generation sequencing to investigate a male infant with clinical and immunological manifestations suggestive of a PID. Whole-exome sequencing of the infant along with his parents revealed a novel nucleotide variant (cytosine to adenine substitution at nucleotide position 252) in the coding re  ...[more]

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