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De Novo GMNN Mutations Cause Autosomal-Dominant Primordial Dwarfism Associated with Meier-Gorlin Syndrome.

Abstract：

:Meier-Gorlin syndrome (MGS) is a genetically heterogeneous primordial dwarfism syndrome known to be caused by biallelic loss-of-function mutations in one of five genes encoding pre-replication complex proteins: ORC1, ORC4, ORC6, CDT1, and CDC6. Mutations in these genes cause disruption of the origin of DNA replication initiation. To date, only an autosomal-recessive inheritance pattern has been described in individuals with this disorder, with a molecular etiology established in about three-fourths of cases. Here, we report three subjects with MGS and de novo heterozygous mutations in the 5' end of GMNN, encoding the DNA replication inhibitor geminin. We identified two truncating mutations in exon 2 (the 1(st) coding exon), c.16A>T (p.Lys6(∗)) and c.35_38delTCAA (p.Ile12Lysfs(∗)4), and one missense mutation, c.50A>G (p.Lys17Arg), affecting the second-to-last nucleotide of exon 2 and possibly RNA splicing. Geminin is present during the S, G2, and M phases of the cell cycle and is degraded during the metaphase-anaphase transition by the anaphase-promoting complex (APC), which recognizes the destruction box sequence near the 5' end of the geminin protein. All three GMNN mutations identified alter sites 5' to residue Met28 of the protein, which is located within the destruction box. We present data supporting a gain-of-function mechanism, in which the GMNN mutations result in proteins lacking the destruction box and hence increased protein stability and prolonged inhibition of replication leading to autosomal-dominant MGS.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Burrage LC,Charng WL,Eldomery MK,Willer JR,Davis EE,Lugtenberg D,Zhu W,Leduc MS,Akdemir ZC,Azamian M,Zapata G,Hernandez PP,Schoots J,de Munnik SA,Roepman R,Pearring JN,Jhangiani S,Katsanis N,Vissers LE,Brunner HG,

doi

10.1016/j.ajhg.2015.11.006

subject

Has Abstract

pub_date

2015-12-03 00:00:00

pages

904-13

issue

6

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(15)00451-6

journal_volume

97

pub_type

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