What does this research mean for the field?

Pathogenic variants in the CTCF gene exhibit marked phenotypic heterogeneity, including somatic overgrowth and severe neonatal multisystem involvement, which contrasts with the classically emphasized short stature in MRD21. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To evaluate the clinical phenotypes and genetic features of four pediatric patients carrying pathogenic CTCF variants and investigate the genotype–phenotype heterogeneity of autosomal dominant intellectual disability type 21 (MRD21).

August 26, 2026GenesOpen Access

A Genotype–Phenotype Analysis of Four Chinese Children Carrying Distinct Pathogenic Variants in the CTCF Gene

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Authors

JDJuan DuCentral South University MLMuhan LiBeijing Children’s Hospital ALAimin LiangCapital Medical University

Discussion

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Implication

Retrospective study reveals marked phenotypic heterogeneity including somatic overgrowth and chylothorax in children with CTCF variants, expanding the recognized spectrum of MRD21.

Key Points

To evaluate the clinical phenotypes and genetic features of four pediatric patients carrying pathogenic CTCF variants and investigate the genotype–phenotype heterogeneity of autosomal dominant intellectual disability type 21 (MRD21).
Retrospectively analyzed medical history, physical exams, and laboratory data of four pediatric patients admitted to Beijing Children's Hospital between 2020 and 2024 (N=4).
Identified genetic variants via high-throughput sequencing and confirmed proband and parental inheritance using Sanger sequencing or CNV-seq.
Identified four distinct de novo heterozygous CTCF variants, including a missense variant (c.1117C>T), a novel 8.92 Mb microdeletion encompassing the entire gene, a frameshift deletion (c.615_618delGAAA), and a novel intragenic deletion of exons 8–10.
Three patients presented with global developmental delay, with two exhibiting somatic overgrowth (height and weight >97th percentile) contrary to typical MRD21 short stature, while the fourth exhibited neonatal chylothorax and cardiovascular malformations with only mild developmental lag.

Cite This Study

Du et al. (2026) studied this question.

synapsesocial.com/papers/6a8e9b21451774b83f3b3a4e https://doi.org/10.3390/genes17090995

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Implication

Retrospective study reveals marked phenotypic heterogeneity including somatic overgrowth and chylothorax in children with CTCF variants, expanding the recognized spectrum of MRD21.

A Genotype–Phenotype Analysis of Four Chinese Children Carrying Distinct Pathogenic Variants in the CTCF Gene

Discussion

Member takes

Implication

Key Points

Cite This Study

A Genotype–Phenotype Analysis of Four Chinese Children Carrying Distinct Pathogenic Variants in the CTCF Gene

Discussion

Member takes

Implication

Key Points

Cite This Study

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