Koolen–De Vries syndrome
Rare genetic disorder from 17q21.31 microdeletion, discovered in 2006.
Koolen–De Vries syndrome (KdVS), also known as 17q21.31 microdeletion syndrome, is a rare genetic disorder often caused by a deletion of a segment of chromosome 17 containing six genes, notably including KANSL1, though other mutations affecting KANSL1 can also cause it. The syndrome was independently discovered in 2006 by three different research groups and is now recognized as one of the more common recurrent microdeletion syndromes.
- discovery_year
- 2006
- discovered_by
- Three independent research groups, including Dutch geneticists David A. Koolen and Bert B. A. de Vries
- genetic_cause
- Deletion of 17q21.31 segment (500–650 kb) containing at least six genes, or other mutations affecting KANSL1
- estimated_prevalence
- 1 in every 16,000 people
- common_features
- Low birthweight, low muscle tone, poor feeding, developmental delays, amiable behavior, epilepsy, heart defects, kidney/urological anomalies
Lore & Background
Symptoms are variable but common features include low birthweight, low muscle tone at birth, poor feeding in infancy often requiring tube feeding, oromotor dyspraxia, moderate developmental delays, learning disabilities, and amiable behavior. Other features include epilepsy, heart defects (atrial septal defect, ventricular septal defect), kidney/urological anomalies, silvery depigmentation of strands of hair, and coarsening of facial features with age. Diagnosis is established with chromosome microarray analysis, and treatment centers on individual symptoms.
Reader's Guide
Koolen–De Vries syndrome is significant as one of the more common recurrent microdeletion syndromes, discovered independently by three groups in 2006. Its identification has advanced understanding of how specific chromosomal deletions and mutations in the KANSL1 gene lead to a recognizable pattern of developmental and physical features. The syndrome's variable presentation—from low birthweight and feeding difficulties to epilepsy and heart defects—highlights the importance of genetic testing for accurate diagnosis. The discovery of a common inversion polymorphism in parental chromosomes that predisposes to the deletion via non-allelic homologous recombination provides insight into the mechanism of recurrent genomic rearrangements. The syndrome's legacy includes improved clinical recognition, early intervention strategies such as physiotherapy and speech therapy, and ongoing research into the roles of the deleted genes, particularly KANSL1 and MAPT.
Did You Know?
- The syndrome was discovered independently in 2006 by three different research groups.
- The recurrent deletion is between 500 and 650 kilobases in size and contains at least six genes, including KANSL1 and MAPT.
- Silvery depigmentation of strands of hair has been noted in several patients.
- An overview estimated the disorder is present in 1 in every 16,000 people.
Frequently Asked Questions
Who is Koolen–De Vries syndrome?
KdVS is a rare inherited condition triggered when a chunk of chromosome 17 (the 17q21.31 region, roughly 500–650 kb long) goes missing, taking out at least six genes including KANSL1. It can also arise from other mutations that disrupt KANSL1 function. It affects roughly 1 in 16,000 individuals worldwide.
What are Koolen–De Vries syndrome's powers/role?
On the 'character sheet,' KdVS presents with low muscle tone, feeding difficulties in infancy, and developmental delays as core traits. Additional features can include epilepsy, congenital heart defects, kidney or urinary-tract anomalies, and a notably friendly, amiable temperament.
How does Koolen–De Vries syndrome's story end?
There is no single 'ending'; most individuals live into adulthood, though they typically require ongoing support for developmental, medical, and behavioral needs. Prognosis varies widely depending on the severity of associated features such as epilepsy or cardiac issues.
Why is Koolen–De Vries syndrome important?
It ranks among the more frequently encountered recurrent microdeletion syndromes, making it a key reference point in clinical genetics. Its 2006 identification helped establish that small, sub-microscopic chromosomal gaps can produce a recognizable, multi-system clinical picture.
What's the origin story of Koolen–De Vries syndrome?
Three separate research teams identified the condition independently in 2006, including Dutch geneticists David A. Koolen and Bert B. A. de Vries, after whom the syndrome is named. The concurrent discoveries across groups quickly cemented it as a distinct diagnostic entity.
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