@article {657,
	title = {GGC Repeat Expansion and Exon 1 Methylation of XYLT1 Is a Common Pathogenic Variant in Baratela-Scott Syndrome.},
	journal = {Am J Hum Genet},
	volume = {104},
	year = {2019},
	month = {2019 Jan 03},
	pages = {35-44},
	abstract = {<p>Baratela-Scott syndrome (BSS) is a rare, autosomal-recessive disorder characterized by short stature, facial dysmorphisms, developmental delay, and skeletal dysplasia caused by pathogenic variants in XYLT1. We report clinical and molecular investigation of 10 families (12 individuals) with BSS. Standard sequencing methods identified biallelic pathogenic variants in XYLT1 in only two families. Of the remaining cohort, two probands had no variants and six probands had only a single variant, including four with a heterozygous 3.1 Mb 16p13 deletion encompassing XYLT1 and two with a heterozygous truncating variant. Bisulfite sequencing revealed aberrant hypermethylation in exon 1 of XYLT1, always in trans with the sequence variant or deletion when present; both alleles were methylated in those with no identified variant. Expression of the methylated XYLT1 allele was severely reduced in fibroblasts from two probands. Southern blot studies combined with repeat expansion analysis of genome sequence data showed that the hypermethylation is associated with expansion of a GGC repeat in the XYLT1 promoter region that is not present in the reference genome, confirming that BSS is a trinucleotide repeat expansion disorder. The hypermethylated allele accounts for 50\% of disease alleles in our cohort and is not present in 130 control subjects. Our study highlights the importance of investigating non-sequence-based alterations, including epigenetic changes, to identify the missing heritability in genetic disorders.</p>},
	issn = {1537-6605},
	doi = {10.1016/j.ajhg.2018.11.005},
	author = {LaCroix, Amy J and Stabley, Deborah and Sahraoui, Rebecca and Adam, Margaret P and Mehaffey, Michele and Kernan, Kelly and Myers, Candace T and Fagerstrom, Carrie and Anadiotis, George and Akkari, Yassmine M and Robbins, Katherine M and Gripp, Karen W and Baratela, Wagner A R and Bober, Michael B and Duker, Angela L and Doherty, Dan and Dempsey, Jennifer C and Miller, Daniel G and Kircher, Martin and Bamshad, Michael J and Nickerson, Deborah A and Mefford, Heather C and Sol-Church, Katia}
}
@article {65,
	title = {Germline De Novo Mutations in GNB1 Cause Severe Neurodevelopmental Disability, Hypotonia, and Seizures.},
	journal = {Am J Hum Genet},
	volume = {98},
	year = {2016},
	month = {2016 05 05},
	pages = {1001-1010},
	abstract = {<p>Whole-exome sequencing of 13 individuals with developmental delay commonly accompanied by abnormal muscle tone and seizures identified de novo missense mutations enriched within a sub-region of GNB1, a gene encoding the guanine nucleotide-binding protein~subunit beta-1, Gβ. These 13 individuals were identified among a base of 5,855 individuals recruited for various undiagnosed genetic disorders. The probability of observing 13 or more de novo mutations by chance among 5,855 individuals is very low (p~=~7.1~{\texttimes} 10(-21)), implicating GNB1 as a genome-wide-significant disease-associated gene. The majority of these 13 mutations affect known Gβ binding sites, which suggests that a likely disease mechanism is through the disruption of the protein interface required for Gα-Gβγ interaction (resulting in a constitutively active Gβγ) or through the disruption of residues relevant for interaction between Gβγ and certain downstream effectors (resulting in reduced interaction with the effectors). Strikingly, 8 of the 13 individuals recruited here for a neurodevelopmental disorder have a germline de novo GNB1 mutation that overlaps a set of five recurrent somatic tumor mutations for which recent functional studies demonstrated a gain-of-function effect due to constitutive activation of G protein downstream signaling cascades for some of the affected residues.</p>},
	keywords = {Adolescent, Adult, Child, Child, Preschool, Developmental Disabilities, Exome, Female, Germ-Line Mutation, GTP-Binding Protein beta Subunits, Humans, Infant, Intellectual Disability, Male, Muscle Hypotonia, Phenotype, Protein Conformation, Seizures, Signal Transduction, Young Adult},
	issn = {1537-6605},
	doi = {10.1016/j.ajhg.2016.03.011},
	author = {Petrovski, Slav{\'e} and K{\"u}ry, S{\'e}bastien and Myers, Candace T and Anyane-Yeboa, Kwame and Cogn{\'e}, Benjamin and Bialer, Martin and Xia, Fan and Hemati, Parisa and Riviello, James and Mehaffey, Michele and Besnard, Thomas and Becraft, Emily and Wadley, Alexandrea and Politi, Anya Revah and Colombo, Sophie and Zhu, Xiaolin and Ren, Zhong and Andrews, Ian and Dudding-Byth, Tracy and Schneider, Amy L and Wallace, Geoffrey and Rosen, Aaron B I and Schelley, Susan and Enns, Gregory M and Corre, Pierre and Dalton, Joline and Mercier, Sandra and Latypova, X{\'e}nia and Schmitt, S{\'e}bastien and Guzman, Edwin and Moore, Christine and Bier, Louise and Heinzen, Erin L and Karachunski, Peter and Shur, Natasha and Grebe, Theresa and Basinger, Alice and Nguyen, Joanne M and B{\'e}zieau, St{\'e}phane and Wierenga, Klaas and Bernstein, Jonathan A and Scheffer, Ingrid E and Rosenfeld, Jill A and Mefford, Heather C and Isidor, Bertrand and Goldstein, David B}
}
