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. 2020 May;22(5):878-888.
doi: 10.1038/s41436-019-0747-z. Epub 2020 Jan 17.

GATAD2B-associated neurodevelopmental disorder (GAND): clinical and molecular insights into a NuRD-related disorder

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GATAD2B-associated neurodevelopmental disorder (GAND): clinical and molecular insights into a NuRD-related disorder

Christine Shieh et al. Genet Med. 2020 May.

Erratum in

  • Correction: GATAD2B-associated neurodevelopmental disorder (GAND): clinical and molecular insights into a NuRD-related disorder.
    Shieh C, Jones N, Vanle B, Au M, Huang AY, Silva APG, Lee H, Douine ED, Otero MG, Choi A, Grand K, Taff IP, Delgado MR, Hajianpour MJ, Seeley A, Rohena L, Vernon H, Gripp KW, Vergano SA, Mahida S, Naidu S, Sousa AB, Wain KE, Challman TD, Beek G, Basel D, Ranells J, Smith R, Yusupov R, Freckmann ML, Ohden L, Davis-Keppen L, Chitayat D, Dowling JJ, Finkel R, Dauber A, Spillmann R, Pena LDM; Undiagnosed Diseases Network; Metcalfe K, Splitt M, Lachlan K, McKee SA, Hurst J, Fitzpatrick DR, Morton JEV, Cox H, Venkateswaran S, Young JI, Marsh ED, Nelson SF, Martinez JA, Graham JM Jr, Kini U, Mackay JP, Pierson TM. Shieh C, et al. Genet Med. 2020 Apr;22(4):822. doi: 10.1038/s41436-020-0760-2. Genet Med. 2020. PMID: 32047287 Free PMC article.

Abstract

Purpose: Determination of genotypic/phenotypic features of GATAD2B-associated neurodevelopmental disorder (GAND).

Methods: Fifty GAND subjects were evaluated to determine consistent genotypic/phenotypic features. Immunoprecipitation assays utilizing in vitro transcription-translation products were used to evaluate GATAD2B missense variants' ability to interact with binding partners within the nucleosome remodeling and deacetylase (NuRD) complex.

Results: Subjects had clinical findings that included macrocephaly, hypotonia, intellectual disability, neonatal feeding issues, polyhydramnios, apraxia of speech, epilepsy, and bicuspid aortic valves. Forty-one novelGATAD2B variants were identified with multiple variant types (nonsense, truncating frameshift, splice-site variants, deletions, and missense). Seven subjects were identified with missense variants that localized within two conserved region domains (CR1 or CR2) of the GATAD2B protein. Immunoprecipitation assays revealed several of these missense variants disrupted GATAD2B interactions with its NuRD complex binding partners.

Conclusions: A consistent GAND phenotype was caused by a range of genetic variants in GATAD2B that include loss-of-function and missense subtypes. Missense variants were present in conserved region domains that disrupted assembly of NuRD complex proteins. GAND's clinical phenotype had substantial clinical overlap with other disorders associated with the NuRD complex that involve CHD3 and CHD4, with clinical features of hypotonia, intellectual disability, cardiac defects, childhood apraxia of speech, and macrocephaly.

Keywords: GATAD2B; NuRD complex; apraxia of speech; chromatin remodeling; macrocephaly.

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Conflict of interest statement

Disclosures: The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.. Genomic and Protein Schematic Diagram with GAND variants.
All reported pathogenic GATAD2B variants from our study are represented as deletions, splice-site or protein changes below the protein diagram. Genomic deletions are represented as bars below the figure. Previously reported variants and deletions are represented with grey letters and bars above the diagram. * = monozygotic twins; # = somatic mosaic family
Fig. 2.
Fig. 2.. Photographs of affected individuals with associated with variant types. a-e:
Nonsense or truncating frameshift variants: a. GAND19 b. GAND18 c. GAND33 & GAND34 d. GAND53 e. GAND20 f-k: Missense variants: f. GAND28 g. GAND15 h. GAND52 i. GAND32 j. GAND55 k. GAND49 l-q: Splice-site variants: l. GAND17 m. GAND27 n. GAND42 o. GAND21 p. GAND6 q-v: Nonsense or truncating frameshift variants: q. GAND40 r. GAND12 s. GAND3 t. GAND13 u. GAND8 v. GAND36 w. GAND2 x. composite of 19 photographs of GAND subjects and y. 19 healthy controls (FDNA Inc. USA).
Fig. 3.
Fig. 3.. Neuroimaging of GAND8 and GAND53.
a-b: GAND8 a. Axial FLAIR image showed enlarged subarachnoid spaces and nonobstructive ventriculomegaly of the lateral ventricles (cavum vergae was also present) b. Sagittal T1 showed macrocephaly, enlarged extra-axial fluid, and a thin corpus callosum c-d: GAND53 c. Sagittal T1 with normal corpus callosum and structures (prominence of the extraaxial CSF spaces previously seen on earlier imaging had resolved) d. Axial FLAIR image showing multiple punctate and patchy foci of nonspecific signal hyperintensity scattered in the bilateral cerebral white matter, particularly involving the parietal lobes.
Fig. 4.
Fig. 4.. GAND-associated missense variants L180P, R414Q, C420S and C420R disrupt binding to NuRD components CHD3/4/5 or MBD2/3.
a) FLAG-tagged MBD2 or MBD3 were co-expressed with HA-GATAD2B (wild type (WT) or L180P) by in vitro transcription-translation (IVT) in a rabbit reticulocyte lysate. b) The FLAG-tagged C1-C2 domains of CHD3, CHD4 or CHD5 was co-expressed with HA-GATAD2B (WT, R414Q, C420R, C420S, and G406R) in IVTs. In all experiments, FLAG-fusion proteins were immobilized on αFLAG affinity beads and used as baits to pull down the co-expressed HA-GATAD2B. As a negative control, wild-type (WT) HA-GATAD2B was added to beads to which no FLAG fusion protein had been immobilized. In each case, 10% of inputs and 50% of elutions were loaded on an SDS-PAGE and proteins were detected by Western blot, using αHA and/or αFLAG antibodies. # = degradation product of FLAG-MBD2.

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