Abstract
The parent-of-origin-dependent expression of IGF2 and H19 is controlled by the imprinting center 1 (IC1) consisting of a methylation-sensitive chromatin insulator. IC1 is normally methylated on the paternal chromosome and nonmethylated on the maternal chromosome. We found that 22 cases in a large cohort of patients affected by Beckwith-Wiedemann syndrome (BWS) had IC1 methylated on both parental chromosomes, resulting in biallelic activation of IGF2 and biallelic silencing of H19. These individuals had marked macrosomia and high incidence of Wilms' tumor. A subset of these patients had 1.4- to 1.8-kb deletions with hypermethylation of the remaining IC1 region and fully penetrant BWS phenotype when transmitted maternally. Another subset of individuals with IC1 hypermethylation had a similar clinical phenotype but no mutation in the local vicinity. All these cases were sporadic and in at least two families affected and unaffected members shared the same maternal IC1 allele but not the abnormal maternal epigenotype. Similarly, no IC1 deletion was detected in 10 nonsyndromic Wilms' tumors with IC1 hypermethylation. In conclusion, methylation defects at the IGF2-H19 locus can result from inherited mutations of the imprinting center and have high recurrence risk or arise independently from the sequence context and not transmitted to the progeny.
| Original language | English |
|---|---|
| Title of host publication | Endocrine Development |
| Pages | 1-9 |
| Number of pages | 9 |
| Volume | 14 |
| DOIs | |
| Publication status | Published - 2009 |
Publication series
| Name | Endocrine Development |
|---|---|
| Volume | 14 |
| ISSN (Print) | 14217082 |
| ISSN (Electronic) | 16622979 |
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ASJC Scopus subject areas
- Endocrinology, Diabetes and Metabolism
- Pediatrics, Perinatology, and Child Health
- Endocrinology
- Endocrine and Autonomic Systems
Cite this
Inherited and sporadic epimutations at the IGF2-H19 locus in beckwith-wiedemann syndrome and wilms' tumor. / Riccio, Andrea; Sparago, Angela; Verde, Gaetano; De Crescenzo, Agostina; Citro, Valentina; Cubellis, Maria Vittoria; Ferrero, Giovanni Battista; Silengo, Margherita Cirillo; Russo, Silvia; Larizza, Lidia; Cerrato, Flavia.
Endocrine Development. Vol. 14 2009. p. 1-9 (Endocrine Development; Vol. 14).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Inherited and sporadic epimutations at the IGF2-H19 locus in beckwith-wiedemann syndrome and wilms' tumor
AU - Riccio, Andrea
AU - Sparago, Angela
AU - Verde, Gaetano
AU - De Crescenzo, Agostina
AU - Citro, Valentina
AU - Cubellis, Maria Vittoria
AU - Ferrero, Giovanni Battista
AU - Silengo, Margherita Cirillo
AU - Russo, Silvia
AU - Larizza, Lidia
AU - Cerrato, Flavia
PY - 2009
Y1 - 2009
N2 - The parent-of-origin-dependent expression of IGF2 and H19 is controlled by the imprinting center 1 (IC1) consisting of a methylation-sensitive chromatin insulator. IC1 is normally methylated on the paternal chromosome and nonmethylated on the maternal chromosome. We found that 22 cases in a large cohort of patients affected by Beckwith-Wiedemann syndrome (BWS) had IC1 methylated on both parental chromosomes, resulting in biallelic activation of IGF2 and biallelic silencing of H19. These individuals had marked macrosomia and high incidence of Wilms' tumor. A subset of these patients had 1.4- to 1.8-kb deletions with hypermethylation of the remaining IC1 region and fully penetrant BWS phenotype when transmitted maternally. Another subset of individuals with IC1 hypermethylation had a similar clinical phenotype but no mutation in the local vicinity. All these cases were sporadic and in at least two families affected and unaffected members shared the same maternal IC1 allele but not the abnormal maternal epigenotype. Similarly, no IC1 deletion was detected in 10 nonsyndromic Wilms' tumors with IC1 hypermethylation. In conclusion, methylation defects at the IGF2-H19 locus can result from inherited mutations of the imprinting center and have high recurrence risk or arise independently from the sequence context and not transmitted to the progeny.
AB - The parent-of-origin-dependent expression of IGF2 and H19 is controlled by the imprinting center 1 (IC1) consisting of a methylation-sensitive chromatin insulator. IC1 is normally methylated on the paternal chromosome and nonmethylated on the maternal chromosome. We found that 22 cases in a large cohort of patients affected by Beckwith-Wiedemann syndrome (BWS) had IC1 methylated on both parental chromosomes, resulting in biallelic activation of IGF2 and biallelic silencing of H19. These individuals had marked macrosomia and high incidence of Wilms' tumor. A subset of these patients had 1.4- to 1.8-kb deletions with hypermethylation of the remaining IC1 region and fully penetrant BWS phenotype when transmitted maternally. Another subset of individuals with IC1 hypermethylation had a similar clinical phenotype but no mutation in the local vicinity. All these cases were sporadic and in at least two families affected and unaffected members shared the same maternal IC1 allele but not the abnormal maternal epigenotype. Similarly, no IC1 deletion was detected in 10 nonsyndromic Wilms' tumors with IC1 hypermethylation. In conclusion, methylation defects at the IGF2-H19 locus can result from inherited mutations of the imprinting center and have high recurrence risk or arise independently from the sequence context and not transmitted to the progeny.
UR - http://www.scopus.com/inward/record.url?scp=65549151250&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=65549151250&partnerID=8YFLogxK
U2 - 10.1159/000207461
DO - 10.1159/000207461
M3 - Conference contribution
C2 - 19293570
AN - SCOPUS:65549151250
SN - 9783805590419
VL - 14
T3 - Endocrine Development
SP - 1
EP - 9
BT - Endocrine Development
ER -