A case report of the neurocognitive and behavioral phenotype of mosaic trisomy 14

ABSTRACT

Mosaic trisomy 14 is associated with impaired intellectual functioning, although no study has examined the cognitive-behavioral profile associated with the syndrome. This study provides the first case description of the cognitive-behavioral phenotype associated with mosaic trisomy 14 by contrasting the performance an adolescent female (T14) with a group of females with Down syndrome (DS; n=9). T14 performed below age expectations on most direct assessments and demonstrated weaknesses relative to the DS group on aspects of language, adaptive functioning, and executive functioning. T14 also demonstrated strengths in delayed visual recall and social skills relative to the DS group.

KEYWORDS:

• Cognition
• neurodevelopment
• intellectual disability
• genetic disorder

Acknowledgments

We thank T14 and her family for their participation.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessed here.

Additional information

Funding

The Lejeune Foundation funded this work.