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Neuronal migration genes and a familial translocation t (3;17): candidate genes implicated in the phenotype.

Abstract：

BACKGROUND:While Miller-Dieker syndrome critical region deletions are well known delineated anomalies, submicroscopic duplications in this region have recently emerged as a new distinctive syndrome. So far, only few cases have been described overlapping 17p13.3 duplications. METHODS:In this study, we report on clinical and cytogenetic characterization of two new cases involving 17p13.3 and 3p26 chromosomal regions in two sisters with familial history of lissencephaly. Fluorescent In Situ Hybridization and array Comparative Genomic Hybridization were performed. RESULTS:A deletion including the critical region of the Miller-Dieker syndrome of at least 2,9 Mb and a duplication of at least 3,6 Mb on the short arm of chromosome 3 were highlighted in one case. The opposite rearrangements, 17p13.3 duplication and 3p deletion, were observed in the second case. This double chromosomal aberration is the result of an adjacent 1:1 meiotic segregation of a maternal reciprocal translocation t(3,17)(p26.2;p13.3). CONCLUSIONS:17p13.3 and 3p26 deletions have a clear range of phenotypic features while duplications still have an uncertain clinical significance. However, we could suggest that regardless of the type of the rearrangement, the gene dosage and interactions of CNTN4, CNTN6 and CHL1 in the 3p26 and PAFAH1B1, YWHAE in 17p13.3 could result in different clinical spectrums.

journal_name

BMC Med Genet

journal_title

BMC medical genetics

authors

Hadj Amor M,Dimassi S,Taj A,Slimani W,Hannachi H,Mlika A,Ben Helel K,Saad A,Mougou-Zerelli S

doi

10.1186/s12881-020-0966-9

subject

Has Abstract

pub_date

2020-02-06 00:00:00

pages

26

issue

1

issn

1471-2350

pii

10.1186/s12881-020-0966-9

journal_volume

21

pub_type

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