Childhood Apraxia of Speech (CAS) in two patients with 16p11.2 microdeletion syndrome.
We report clinical findings that extend the phenotype of the ~550 kb 16p11.2 microdeletion syndrome to include a rare, severe, and persistent pediatric speech sound disorder termed Childhood Apraxia of Speech (CAS). CAS is the speech disorder identified in a multigenerational pedigree ('KE') in which half of the members have a mutation in FOXP2 that co-segregates with CAS, oromotor apraxia, and low scores on a nonword repetition task. Each of the two patients in the current report completed a 2-h assessment protocol that provided information on their cognitive, language, speech, oral mechanism, motor, and developmental histories and performance. Their histories and standard scores on perceptual and acoustic speech tasks met clinical and research criteria for CAS. Array comparative genomic hybridization analyses identified deletions at chromosome 16p11.2 in each patient. These are the first reported cases with well-characterized CAS in the 16p11.2 syndrome literature and the first report of this microdeletion in CAS genetics research. We discuss implications of findings for issues in both literatures.
University of Wisconsin-Madison, Madison, WI 53705, USA.
Gordana
G
Raca
Becky S
BS
Baas
Salman
S
Kirmani
Jennifer J
JJ
Laffin
Craig A
CA
Jackson
Edythe A
EA
Strand
Kathy J
KJ
Jakielski
Lawrence D
LD
Shriberg
D001072:Apraxias / Q000175:diagnosis / Q000235:genetics*; D002648:Child; D002885:Chromosomes, Human, Pair 16 / Q000235:genetics*; D055028:Comparative Genomic Hybridization; D051858:Forkhead Transcription Factors / Q000235:genetics; D006801:Humans; D010375:Pedigree; D017384:Sequence Deletion; D013577:Syndrome
C465448:FOXP2 protein, human; D051858:Forkhead Transcription Factors