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Heterozygous variants that disturb the transcriptional repressor activity of FOXP4 cause a developmental disorder with speech/language delays and multiple congenital abnormalities.
Snijders Blok L, Vino A, den Hoed J, Underhill HR, Monteil D, Li H, Reynoso Santos FJ, Chung WK, Amaral MD, Schnur RE, Santiago-Sim T, Si Y, Brunner HG, Kleefstra T, Fisher SE. Snijders Blok L, et al. Among authors: kleefstra t. Genet Med. 2021 Mar;23(3):534-542. doi: 10.1038/s41436-020-01016-6. Epub 2020 Oct 28. Genet Med. 2021. PMID: 33110267 Free PMC article.
Low frequency of MECP2 mutations in mentally retarded males.
Yntema HG, Kleefstra T, Oudakker AR, Romein T, de Vries BB, Nillesen W, Sistermans EA, Brunner HG, Hamel BC, van Bokhoven H. Yntema HG, et al. Among authors: kleefstra t. Eur J Hum Genet. 2002 Aug;10(8):487-90. doi: 10.1038/sj.ejhg.5200836. Eur J Hum Genet. 2002. PMID: 12111644
Mutations in the JARID1C gene, which is involved in transcriptional regulation and chromatin remodeling, cause X-linked mental retardation.
Jensen LR, Amende M, Gurok U, Moser B, Gimmel V, Tzschach A, Janecke AR, Tariverdian G, Chelly J, Fryns JP, Van Esch H, Kleefstra T, Hamel B, Moraine C, Gecz J, Turner G, Reinhardt R, Kalscheuer VM, Ropers HH, Lenzner S. Jensen LR, et al. Among authors: kleefstra t. Am J Hum Genet. 2005 Feb;76(2):227-36. doi: 10.1086/427563. Epub 2004 Dec 7. Am J Hum Genet. 2005. PMID: 15586325 Free PMC article.
Disruption of the gene Euchromatin Histone Methyl Transferase1 (Eu-HMTase1) is associated with the 9q34 subtelomeric deletion syndrome.
Kleefstra T, Smidt M, Banning MJ, Oudakker AR, Van Esch H, de Brouwer AP, Nillesen W, Sistermans EA, Hamel BC, de Bruijn D, Fryns JP, Yntema HG, Brunner HG, de Vries BB, van Bokhoven H. Kleefstra T, et al. J Med Genet. 2005 Apr;42(4):299-306. doi: 10.1136/jmg.2004.028464. J Med Genet. 2005. PMID: 15805155 Free PMC article.
Pure subtelomeric microduplications as a cause of mental retardation.
Ruiter EM, Koolen DA, Kleefstra T, Nillesen WM, Pfundt R, de Leeuw N, Hamel BC, Brunner HG, Sistermans EA, de Vries BB. Ruiter EM, et al. Among authors: kleefstra t. Clin Genet. 2007 Oct;72(4):362-8. doi: 10.1111/j.1399-0004.2007.00874.x. Clin Genet. 2007. PMID: 17850634
Further clinical and molecular delineation of the 9q subtelomeric deletion syndrome supports a major contribution of EHMT1 haploinsufficiency to the core phenotype.
Kleefstra T, van Zelst-Stams WA, Nillesen WM, Cormier-Daire V, Houge G, Foulds N, van Dooren M, Willemsen MH, Pfundt R, Turner A, Wilson M, McGaughran J, Rauch A, Zenker M, Adam MP, Innes M, Davies C, López AG, Casalone R, Weber A, Brueton LA, Navarro AD, Bralo MP, Venselaar H, Stegmann SP, Yntema HG, van Bokhoven H, Brunner HG. Kleefstra T, et al. J Med Genet. 2009 Sep;46(9):598-606. doi: 10.1136/jmg.2008.062950. Epub 2009 Mar 4. J Med Genet. 2009. PMID: 19264732 Free article.
Further delineation of the 15q13 microdeletion and duplication syndromes: a clinical spectrum varying from non-pathogenic to a severe outcome.
van Bon BW, Mefford HC, Menten B, Koolen DA, Sharp AJ, Nillesen WM, Innis JW, de Ravel TJ, Mercer CL, Fichera M, Stewart H, Connell LE, Ounap K, Lachlan K, Castle B, Van der Aa N, van Ravenswaaij C, Nobrega MA, Serra-Juhé C, Simonic I, de Leeuw N, Pfundt R, Bongers EM, Baker C, Finnemore P, Huang S, Maloney VK, Crolla JA, van Kalmthout M, Elia M, Vandeweyer G, Fryns JP, Janssens S, Foulds N, Reitano S, Smith K, Parkel S, Loeys B, Woods CG, Oostra A, Speleman F, Pereira AC, Kurg A, Willatt L, Knight SJ, Vermeesch JR, Romano C, Barber JC, Mortier G, Pérez-Jurado LA, Kooy F, Brunner HG, Eichler EE, Kleefstra T, de Vries BB. van Bon BW, et al. Among authors: kleefstra t. J Med Genet. 2009 Aug;46(8):511-23. doi: 10.1136/jmg.2008.063412. Epub 2009 Apr 15. J Med Genet. 2009. PMID: 19372089 Free PMC article.
UBE2A deficiency syndrome: Mild to severe intellectual disability accompanied by seizures, absent speech, urogenital, and skin anomalies in male patients.
de Leeuw N, Bulk S, Green A, Jaeckle-Santos L, Baker LA, Zinn AR, Kleefstra T, van der Smagt JJ, Vianne Morgante AM, de Vries BB, van Bokhoven H, de Brouwer AP. de Leeuw N, et al. Among authors: kleefstra t. Am J Med Genet A. 2010 Dec;152A(12):3084-90. doi: 10.1002/ajmg.a.33743. Am J Med Genet A. 2010. PMID: 21108393
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