TY - JOUR
T1 - Small supernumerary marker chromosomes
T2 - A legacy of trisomy rescue?
AU - Kurtas, Nehir Edibe
AU - Xumerle, Luciano
AU - Leonardelli, Lorena
AU - Delledonne, Massimo
AU - Brusco, Alfredo
AU - Chrzanowska, Krystyna
AU - Schinzel, Albert
AU - Larizza, Daniela
AU - Guerneri, Silvana
AU - Natacci, Federica
AU - Bonaglia, Maria Clara
AU - Reho, Paolo
AU - Manolakos, Emmanouil
AU - Mattina, Teresa
AU - Soli, Fiorenza
AU - Provenzano, Aldesia
AU - Al-Rikabi, Ahmed H.
AU - Errichiello, Edoardo
AU - Nazaryan-Petersen, Lusine
AU - Giglio, Sabrina
AU - Tommerup, Niels
AU - Liehr, Thomas
AU - Zuffardi, Orsetta
PY - 2019/2/1
Y1 - 2019/2/1
N2 - We studied by a whole genomic approach and trios genotyping, 12 de novo, nonrecurrent small supernumerary marker chromosomes (sSMC), detected as mosaics during pre- or postnatal diagnosis and associated with increased maternal age. Four sSMCs contained pericentromeric portions only, whereas eight had additional non-contiguous portions of the same chromosome, assembled together in a disordered fashion by repair-based mechanisms in a chromothriptic event. Maternal hetero/isodisomy was detected with a paternal origin of the sSMC in some cases, whereas in others two maternal alleles in the sSMC region and biparental haplotypes of the homologs were detected. In other cases, the homologs were biparental while the sSMC had the same haplotype of the maternally inherited chromosome. These findings strongly suggest that most sSMCs are the result of a multiple-step mechanism, initiated by maternal meiotic nondisjunction followed by postzygotic anaphase lagging of the supernumerary chromosome and its subsequent chromothripsis.
AB - We studied by a whole genomic approach and trios genotyping, 12 de novo, nonrecurrent small supernumerary marker chromosomes (sSMC), detected as mosaics during pre- or postnatal diagnosis and associated with increased maternal age. Four sSMCs contained pericentromeric portions only, whereas eight had additional non-contiguous portions of the same chromosome, assembled together in a disordered fashion by repair-based mechanisms in a chromothriptic event. Maternal hetero/isodisomy was detected with a paternal origin of the sSMC in some cases, whereas in others two maternal alleles in the sSMC region and biparental haplotypes of the homologs were detected. In other cases, the homologs were biparental while the sSMC had the same haplotype of the maternally inherited chromosome. These findings strongly suggest that most sSMCs are the result of a multiple-step mechanism, initiated by maternal meiotic nondisjunction followed by postzygotic anaphase lagging of the supernumerary chromosome and its subsequent chromothripsis.
KW - chromothripsis
KW - evolutionary trade-off
KW - maternal meiotic nondisjunction
KW - small supernumerary marker chromosome (sSMC)
KW - whole genome paired-end sequencing (WGS)
U2 - 10.1002/humu.23683
DO - 10.1002/humu.23683
M3 - Journal article
C2 - 30412329
AN - SCOPUS:85056877249
SN - 1059-7794
VL - 401
SP - 193
EP - 200
JO - Human Mutation
JF - Human Mutation
IS - 2
ER -