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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Genes+Dev
2016 ; 30
(19
): 2158-2172
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English Wikipedia
Mutations in genes encoding condensin complex proteins cause microcephaly through
decatenation failure at mitosis
#MMPMID27737959
Martin CA
; Murray JE
; Carroll P
; Leitch A
; Mackenzie KJ
; Halachev M
; Fetit AE
; Keith C
; Bicknell LS
; Fluteau A
; Gautier P
; Hall EA
; Joss S
; Soares G
; Silva J
; Bober MB
; Duker A
; Wise CA
; Quigley AJ
; Phadke SR
; Wood AJ
; Vagnarelli P
; Jackson AP
Genes Dev
2016[Oct]; 30
(19
): 2158-2172
PMID27737959
show ga
Compaction of chromosomes is essential for accurate segregation of the genome
during mitosis. In vertebrates, two condensin complexes ensure timely chromosome
condensation, sister chromatid disentanglement, and maintenance of mitotic
chromosome structure. Here, we report that biallelic mutations in NCAPD2, NCAPH,
or NCAPD3, encoding subunits of these complexes, cause microcephaly. In addition,
hypomorphic Ncaph2 mice have significantly reduced brain size, with frequent
anaphase chromatin bridge formation observed in apical neural progenitors during
neurogenesis. Such DNA bridges also arise in condensin-deficient patient cells,
where they are the consequence of failed sister chromatid disentanglement during
chromosome compaction. This results in chromosome segregation errors, leading to
micronucleus formation and increased aneuploidy in daughter cells. These findings
establish "condensinopathies" as microcephalic disorders, with decatenation
failure as an additional disease mechanism for microcephaly, implicating mitotic
chromosome condensation as a key process ensuring mammalian cerebral cortex size.