Abstract:
:We studied a group of individuals with elevated urinary excretion of 3-methylglutaconic acid, neutropenia that can develop into leukemia, a neurological phenotype ranging from nonprogressive intellectual disability to a prenatal encephalopathy with progressive brain atrophy, movement disorder, cataracts, and early death. Exome sequencing of two unrelated individuals and subsequent Sanger sequencing of 16 individuals with an overlapping phenotype identified a total of 14 rare, predicted deleterious alleles in CLPB in 14 individuals from 9 unrelated families. CLPB encodes caseinolytic peptidase B homolog ClpB, a member of the AAA+ protein family. To evaluate the relevance of CLPB in the pathogenesis of this syndrome, we developed a zebrafish model and an in vitro assay to measure ATPase activity. Suppression of clpb in zebrafish embryos induced a central nervous system phenotype that was consistent with cerebellar and cerebral atrophy that could be rescued by wild-type, but not mutant, human CLPB mRNA. Consistent with these data, the loss-of-function effect of one of the identified variants (c.1222A>G [p.Arg408Gly]) was supported further by in vitro evidence with the mutant peptides abolishing ATPase function. Additionally, we show that CLPB interacts biochemically with ATP2A2, known to be involved in apoptotic processes in severe congenital neutropenia (SCN) 3 (Kostmann disease [caused by HAX1 mutations]). Taken together, mutations in CLPB define a syndrome with intellectual disability, congenital neutropenia, progressive brain atrophy, movement disorder, cataracts, and 3-methylglutaconic aciduria.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Wortmann SB,Ziętkiewicz S,Kousi M,Szklarczyk R,Haack TB,Gersting SW,Muntau AC,Rakovic A,Renkema GH,Rodenburg RJ,Strom TM,Meitinger T,Rubio-Gozalbo ME,Chrusciel E,Distelmaier F,Golzio C,Jansen JH,van Karnebeek C,Lillqudoi
10.1016/j.ajhg.2014.12.013subject
Has Abstractpub_date
2015-02-05 00:00:00pages
245-57issue
2eissn
0002-9297issn
1537-6605pii
S0002-9297(14)00519-9journal_volume
96pub_type
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