Browsing by Author "Seabra, Catarina M."
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- A novel Alu-mediated microdeletion at 11p13 removes WT1 in a patient with cryptorchidism and azoospermiaPublication . Seabra, Catarina M.; Quental, Sofia; Paula Neto, Ana; Carvalho, Filipa; Gonçalves, João; Paulo Oliveira, João; Fernandes, Susana; Sousa, Mário; Barros, Alberto; Amorim, António; Lopes, Alexandra M.This article describes a patient with cryptorchidism and nonobstructive azoospermia presenting a novel microdeletion of approximately 1 Mb at 11p13. It was confirmed by multiplex ligation-dependent probe amplification that this heterozygous deletion spanned nine genes (WT1, EIF3M, CCDC73, PRRG4, QSER1, DEPDC7, TCP11L1, CSTF3 and HIPK3) and positioned the breakpoints within highly homologous repetitive elements. As far as is known, this is the smallest deletion as-yet described encompassing the WT1 gene and was detected only once in a total of 32 Portuguese patients with isolated uni- or bilateral cryptorchidism. These findings suggest that molecular analysis in patients with genitourinary features suggestive of WT1 impairment, namely cryptorchidism and renal abnormalities, may reveal cryptic genetic defects.
- The genomic landscape of balanced cytogenetic abnormalities associated with human congenital anomaliesPublication . Redin, Claire; Brand, Harrison; Collins, Ryan L.; Kammin, Tammy; Mitchell, Elyse; Hodge, Jennelle C.; Hanscom, Carrie; Pillalamarri, Vamsee; Seabra, Catarina M.; Abbott, Mary-Alice; Abdul-Rahman, Omar A.; de Vries, Bert B A.; Earl, Dawn L.; Ferguson, Heather L.; Harris, David J.; Fisher, Heather; FitzPatrick, David R.; Gerrol, Pamela; Giachino, Daniela; Glessner, Joseph T.; Gliem, Troy; Margolin, Lauren; Grady, Margo; Graham, Brett H.; Griffis, Cristin; Hayden, Mark A.; Hill, Rosamund; Hochstenbach, Ron; Hoffman, Jodi D.; Hopkin, Robert J.; Hubshman, Monika W.; Moya, Graciela; Mason, Tamara; Innes, A Micheil; Irons, Mira; Irving, Melita; Jacobsen, Jessie C.; Janssens, Sandra; Jewett, Tamison; Johnson, John P.; Jongmans, Marjolijn C.; Kahler, Stephen G.; Koolen, David A.; Masser-Frye, Diane; Nieuwint, Aggie W.; Korzelius, Jerome; Kroisel, Peter M.; Lacassie, Yves; Lawless, William; Lemyre, Emmanuelle; Leppig, Kathleen; Levin, Alex V.; Li, Haibo; Li, Hong; Parkash, Sandhya; Liao, Eric C.; Ordulu, Zehra; Lim, Cynthia; Lose, Edward J.; Lucente, Diane; Macera, Michael J.; Manavalan, Poornima; Mandrile, Giorgia; Marcelis, Carlo L.; McClellan, Michael W.; Mendoza, Cinthya J. Zepeda; Menten, Björn; Middelkamp, Sjors; Mikami, Liya R.; Moe, Emily; Wiley, Susan; Mohammed, Shehla; Mononen, Tarja; Mortenson, Megan E.; Pauker, Susan P.; Pereira, Shahrin; Perrin, Danielle; Phelan, Katy; Aguilar, Raul E Piña; Poddighe, Pino J.; Aberg, Erika; Wilson, Anna; Pregno, Giulia; Raskin, Salmo; Reis, Linda; Rhead, William; Rita, Debra; Renkens, Ivo; Roelens, Filip; Ruliera, Jayla; Rump, Patrick; Schilit, Samantha L.P.; Yerena-de Vega, Maria de la Concepcion A.; Adley, Rhett; Shaheen, Ranad; Sparkes, Rebecca; Spiegel, Erica; Stevens, Blair; Stone, Matthew R.; Tagoe, Julia; Thakuria, Joseph V.; van Bon, Bregje W.; van de Kamp, Jiddeke; Alkuraya, Fowzan S.; van Der Burgt, Ineke; Alcaraz-Estrada, Sofia L.; van Essen, Ton; van Ravenswaaij-Arts, Conny M.; van Roosmalen, Markus J.; Vergult, Sarah; Volker-Touw, Catharina M.L.; Warburton, Dorothy P.; Waterman, Matthew J.; Zori, Roberto T.; Levy, Brynn; Brunner, Han G.; de Leeuw, Nicole; Kloosterman, Wigard P.; Thorland, Erik C.; Gripp, Karen W.; Morton, Cynthia C.; Gusella, James F.; Talkowski, Michael E.; An, Yu; Anderson, Mary-Anne; Antolik, Caroline; Anyane-Yeboa, Kwame; Atkin, Joan F.; Bartell, Tina; Bernstein, Jonathan A.; Gropman, Andrea L.; Beyer, Elizabeth; Blumenthal, Ian; Bongers, Ernie M.H.F.; Brilstra, Eva H.; Brown, Chester W.; Brüggenwirth, Hennie T.; Callewaert, Bert; Chiang, Colby; Corning, Ken; Cox, Helen; Hanson-Kahn, Andrea; Cuppen, Edwin; Currall, Benjamin B.; Cushing, Tom; David, Dezső; Deardorff, Matthew A.; Dheedene, Annelies; D'Hooghe, MarcDespite the clinical significance of balanced chromosomal abnormalities (BCAs), their characterization has largely been restricted to cytogenetic resolution. We explored the landscape of BCAs at nucleotide resolution in 273 subjects with a spectrum of congenital anomalies. Whole-genome sequencing revised 93% of karyotypes and demonstrated complexity that was cryptic to karyotyping in 21% of BCAs, highlighting the limitations of conventional cytogenetic approaches. At least 33.9% of BCAs resulted in gene disruption that likely contributed to the developmental phenotype, 5.2% were associated with pathogenic genomic imbalances, and 7.3% disrupted topologically associated domains (TADs) encompassing known syndromic loci. Remarkably, BCA breakpoints in eight subjects altered a single TAD encompassing MEF2C, a known driver of 5q14.3 microdeletion syndrome, resulting in decreased MEF2C expression. We propose that sequence-level resolution dramatically improves prediction of clinical outcomes for balanced rearrangements and provides insight into new pathogenic mechanisms, such as altered regulation due to changes in chromosome topology.
- The mutational spectrum of WT1 in male infertilityPublication . Seabra, Catarina M.; Quental, Sofia; Lima, Ana C; Carvalho, Filipa; Gonçalves, João; Fernandes, Susana; Pereira, Iris; Silva, Júlia; Marques, Patrícia I.; Sousa, Mário; Barros, Alberto; Seixas, Susana; Amorim, António; Lopes, Alexandra M.PURPOSE: We evaluated the impact of WT1 mutations in isolated severe spermatogenic impairment in a population of European ancestry. WT1 was first identified as the gene responsible for Wilms tumor. It was later associated with a plethora of clinical phenotypes often accompanied by urogenital defects and male infertility. The recent finding of WT1 missense mutations in Chinese azoospermic males without major gonadal malformations broadened the phenotypic spectrum of WT1 defects and motivated this study. MATERIALS AND METHODS: We analyzed the WT1 coding region in a cohort of 194 Portuguese patients with nonobstructive azoospermia and in 188 with severe oligozoospermia with increased depth for the exons encoding the regulatory region of the protein. We also analyzed a group of 31 infertile males with a clinical history of unilateral or bilateral cryptorchidism and 1 patient with anorchia. RESULTS: We found 2 WT1 missense substitutions at higher frequency in patients than in controls. 1) A novel variant in exon 1 (p.Pro130Leu) that disrupted a mammalian specific polyproline stretch in the self-association domain was more frequent in azoospermia cases (0.27% vs 0.13%, p = 0.549). 2) A rare variant in a conserved residue in close proximity to the first zinc finger (pCys350Arg) was more frequent in severe oligozoospermia cases (0.80% vs 0.13%, p = 0.113). CONCLUSIONS: Results suggest a role for rare WT1 damaging variants in severe spermatogenic failure in populations of European ancestry. Large multicenter studies are needed to fully assess the contribution of WT1 genetic alterations to male infertility in the absence of other disease phenotypes.