Recurrent 1q21.1 deletion syndrome: report on variable expression, nonpenetrance and review of literature

Priyanka Upadhyai, Eram Fatima Amiri, Vishal Singh Guleria, Stephanie L. Bielas, Katta Mohan Girisha, Anju Shukla

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The clinical phenotype of 1q21.1 microdeletion syndrome is highly heterogeneous. It is characterized by dysmorphic facial features, microcephaly, and developmental delay. Several congenital defects, including cardiac, ocular, skeletal anomalies, and psychiatric or behavioural abnormalities, have also been described. Here, we report on two siblings with substantial intrafamilial phenotypic variability carrying a heterozygous deletion of the 1q21.1 region spanning a known critical genomic area (~1.35 Mb). The microdeletion was inherited from the unaffected father. Patients described here show a spectrum of clinical features, a portion of which overlap with those previously reported in patients with 1q21.1 microdeletions. In addition, we review the clinical reports of 66 individuals with this condition. These findings extend and substantiate the current clinical understanding of recurrent copy number variations in the 1q21.1 region.

Original languageEnglish
Pages (from-to)127-131
Number of pages5
JournalClinical Dysmorphology
Issue number3
Publication statusPublished - 01-07-2020

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Anatomy
  • Pathology and Forensic Medicine
  • Genetics(clinical)


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