An Adult Presentation of KIF11-Related MCLID Syndrome: Case Report and 40-Year Follow-Up.
Thrishna Chathurvedula, Juvy Rabelas, Kareem Touleimat et al.
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Case in brief
A 42-year-old woman with severe intellectual disability had microcephaly, hypotonia, seizures, self-injurious behavior, developmental delays, ophthalmologic findings, and impaired speech and adaptive functioning. Trio whole-exome sequencing identified a de novo pathogenic KIF11 in-frame deletion (c.1294_1296del; p.Glu432del); a maternally inherited SCN3A variant was classified as of uncertain significance. Her clinical history provided a longitudinal view spanning more than four decades of KIF11-related MCLID syndrome.
What made this case unusual
The report documents an adult presentation with a longitudinal clinical perspective extending over four decades, an age range and follow-up perspective underrepresented in reports of KIF11-related MCLID.
Diagnostic / clinical pearl
Consider KIF11-related disease in adults with syndromic developmental delay and microcephaly; genetic findings should be interpreted alongside detailed phenotypic and clinical-history assessment.