RESUMEN
We report a 3.1-Mb de novo deletion of 3p21.31 in a 3.5-year-old female with cortical blindness, cleft lip, CNS abnormalities, and gross developmental delays. Examination of the region showed approximately 80 genes to be involved in the deletion. Functional analysis of the deleted genes suggests that several of them may be important in normal neuronal maturation and function. Thus, haploinsufficiency of one or more of these genes could potentially contribute to the observed phenotype. Our patient does not have clinical features that overlap completely with either proximal or distal 3p deletions, suggesting that the deletion seen in our patient leads to a distinct clinical phenotype not described previously.
Asunto(s)
Anomalías Múltiples/genética , Deleción Cromosómica , Trastornos de los Cromosomas , Cromosomas Humanos Par 3 , Anomalías Congénitas/genética , Adulto , Ceguera Cortical/genética , Trastornos de los Cromosomas/genética , Trastornos de los Cromosomas/patología , Labio Leporino/genética , Sondas de ADN , Discapacidades del Desarrollo/genética , Femenino , Estudios de Seguimiento , Genotipo , Humanos , Hibridación Fluorescente in Situ , Lactante , Análisis de Secuencia por Matrices de Oligonucleótidos , Polimorfismo de Nucleótido Simple , Factores de TiempoRESUMEN
X-ray crystallography and NMR spectroscopy provide the only sources of experimental data from which protein structures can be analyzed at high or even atomic resolution. The degree to which these methods complement each other as sources of structural knowledge is a matter of debate; it is often proposed that small proteins yielding high quality, readily analyzed NMR spectra are a subset of those that readily yield strongly diffracting crystals. We have examined the correlation between NMR spectral quality and success in structure determination by X-ray crystallography for 159 prokaryotic and eukaryotic proteins, prescreened to avoid proteins providing polydisperse and/or aggregated samples. This study demonstrates that, across this protein sample set, the quality of a protein's [15N-1H]-heteronuclear correlation (HSQC) spectrum recorded under conditions generally suitable for 3D structure determination by NMR, a key predictor of the ability to determine a structure by NMR, is not correlated with successful crystallization and structure determination by X-ray crystallography. These results, together with similar results of an independent study presented in the accompanying paper (Yee, et al., J. Am. Chem. Soc., accompanying paper), demonstrate that X-ray crystallography and NMR often provide complementary sources of structural data and that both methods are required in order to optimize success for as many targets as possible in large-scale structural proteomics efforts.
