Miller-Dieker syndrome with der(17)t(12;17)(q24.33;p13.3)pat presenting with a potential risk of mis-identification as a de novo submicroscopic deletion of 17p13.3.
Miller-Dieker syndrome involves a severe type of lissencephaly, which is caused by defects in the lissencephaly gene (LIS1). We report the case of a female infant with der(17)t(12;17)(q24.33;p13.3)pat caused by an unbalanced segregation of the parental balanced translocation of 17p with other chromosomes. The proband presented with facial dysmorphism, arthrogryposis, and intrauterine growth retardation. Most cases of Miller-Dieker syndrome have a de novo deletion involving 17p13.3. When Miller-Dieker syndrome is caused by an unbalanced translocation, mild-to-severe phenotypes occur according to the extension of the involved partner chromosome. However, a pure partial monosomy derived from a paternal balanced translocation is relatively rare. In this case, the submicroscopic cryptic deletion in the proband was initially elucidated by FISH, and karyotype analysis did not reveal additional chromosome abnormalities such as translocation. However, a family history of recurrent pregnancy abnormalities strongly suggested familial translocation. Sequential G-banding and FISH analysis of the father's chromosomes showed that the segment of 17p13.3→pter was attached to the 12qter. Thus, we report a case that showed resemblance to the findings in cases of a nearly pure 17p deletion, derived from t(12;17), and delineated by whole genome array comparative genomic hybridization (CGH). If such cases are incorrectly diagnosed as Miller-Dieker syndrome caused by de novo 17p13.3 deletion, the resultant improper genetic counseling may make it difficult to exactly predict the potential risk of recurrent lissencephaly for successive pregnancies.
Department of Laboratory Medicine, Pusan National University Hospital, Busan, Korea.
Young Jin
YJ
Kim
Shin Yun
SY
Byun
Seon A
SA
Jo
Yong Beom
YB
Shin
Eun Hae
EH
Cho
Eun Yup
EY
Lee
Sang-Hyun
SH
Hwang
D000015:Abnormalities, Multiple / Q000235:genetics; D000328:Adult; D001921:Brain / Q000002:abnormalities; D002871:Chromosome Banding; D020090:Chromosome Segregation; D002881:Chromosomes, Human, Pair 12; D002886:Chromosomes, Human, Pair 17; D054221:Classical Lissencephalies and Subcortical Band Heterotopias / Q000175:diagnosis*; D005260:Female; D017353:Gene Deletion; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007231:Infant, Newborn; D007621:Karyotyping; D008279:Magnetic Resonance Imaging; D008297:Male; D010641:Phenotype; D012306:Risk; D014178:Translocation, Genetic
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