Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities
Abstract Background Mosaicism for chromosome rearrangements is common in preimplantation diagnoses, yet is rare in prenatal diagnoses as well as in other groups of patients referred to cytogenetic testing. Consequently, there is a lack of detailed studies on this kind of mosaicism in all groups of p...
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| Format: | Article |
| Language: | English |
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BMC
2017-12-01
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| Series: | Molecular Cytogenetics |
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| Online Access: | http://link.springer.com/article/10.1186/s13039-017-0346-0 |
| _version_ | 1818244084575240192 |
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| author | Natalia V. Kovaleva Philip D. Cotter |
| author_facet | Natalia V. Kovaleva Philip D. Cotter |
| author_sort | Natalia V. Kovaleva |
| collection | DOAJ |
| description | Abstract Background Mosaicism for chromosome rearrangements is common in preimplantation diagnoses, yet is rare in prenatal diagnoses as well as in other groups of patients referred to cytogenetic testing. Consequently, there is a lack of detailed studies on this kind of mosaicism in all groups of patients. Previous reports have identified a deficit of males among asymptomatic carriers of N/unbalanced Rea. Three mechanisms were proposed for explaining this phenomenon, including a high instability in the early female embryonic development, a male-specific selection against abnormal cells in the early embryo development, or a high intrauterine lethality of male carriers. To address these possibilities, we have performed a meta-analysis of male-to-female ratio (sex ratio, SR) in prenatally diagnosed and in spontaneously aborted carriers of mosaic Rea. Results One hundred and twenty one prenatally detected cases of normal cell line/autosome rearrangement mosaicism (N/Rea) with known carriers’ sex were identified from the literature. Carriers of N/unbalanced Rea presented with 38 abnormal and 28 normal/apparently normal outcomes while carriers of N/balanced Rea presented with 24 normal and 3 abnormal outcomes. 58% of carriers of N/unbalanced Rea with an abnormal outcome displayed a high proportion (> 50%) of amniocytes with the abnormality compared to 25% of carriers with normal/apparently normal outcome. More female carriers of N/unbalanced Rea were identified with an abnormal outcome (15 M/23F) in contrast to a notable male predominance (18 M/10F) among those with normal outcome. Additionally, among spontaneously aborted carriers of N/unbalanced Rea, there was a strong female predominance (7 M/23F). Conclusion Previous reports have identified a deficit of male among asymptomatic carriers of N/unbalanced Rea. The current data suggests a male-specific selection against chromosomal abnormalities. |
| first_indexed | 2024-12-12T14:11:24Z |
| format | Article |
| id | doaj.art-eca725de04bd4704a81a94337bbb6b24 |
| institution | Directory Open Access Journal |
| issn | 1755-8166 |
| language | English |
| last_indexed | 2024-12-12T14:11:24Z |
| publishDate | 2017-12-01 |
| publisher | BMC |
| record_format | Article |
| series | Molecular Cytogenetics |
| spelling | doaj.art-eca725de04bd4704a81a94337bbb6b242022-12-22T00:22:04ZengBMCMolecular Cytogenetics1755-81662017-12-011011510.1186/s13039-017-0346-0Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalitiesNatalia V. Kovaleva0Philip D. Cotter1Academy of Molecular MedicineDepartment of Pediatrics, University of California San FranciscoAbstract Background Mosaicism for chromosome rearrangements is common in preimplantation diagnoses, yet is rare in prenatal diagnoses as well as in other groups of patients referred to cytogenetic testing. Consequently, there is a lack of detailed studies on this kind of mosaicism in all groups of patients. Previous reports have identified a deficit of males among asymptomatic carriers of N/unbalanced Rea. Three mechanisms were proposed for explaining this phenomenon, including a high instability in the early female embryonic development, a male-specific selection against abnormal cells in the early embryo development, or a high intrauterine lethality of male carriers. To address these possibilities, we have performed a meta-analysis of male-to-female ratio (sex ratio, SR) in prenatally diagnosed and in spontaneously aborted carriers of mosaic Rea. Results One hundred and twenty one prenatally detected cases of normal cell line/autosome rearrangement mosaicism (N/Rea) with known carriers’ sex were identified from the literature. Carriers of N/unbalanced Rea presented with 38 abnormal and 28 normal/apparently normal outcomes while carriers of N/balanced Rea presented with 24 normal and 3 abnormal outcomes. 58% of carriers of N/unbalanced Rea with an abnormal outcome displayed a high proportion (> 50%) of amniocytes with the abnormality compared to 25% of carriers with normal/apparently normal outcome. More female carriers of N/unbalanced Rea were identified with an abnormal outcome (15 M/23F) in contrast to a notable male predominance (18 M/10F) among those with normal outcome. Additionally, among spontaneously aborted carriers of N/unbalanced Rea, there was a strong female predominance (7 M/23F). Conclusion Previous reports have identified a deficit of male among asymptomatic carriers of N/unbalanced Rea. The current data suggests a male-specific selection against chromosomal abnormalities.http://link.springer.com/article/10.1186/s13039-017-0346-0Segmental somatic mosaicismNon-centromeric autosomal rearrangementGenomic imbalanceSex ratioMaternal agePaternal age |
| spellingShingle | Natalia V. Kovaleva Philip D. Cotter Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities Molecular Cytogenetics Segmental somatic mosaicism Non-centromeric autosomal rearrangement Genomic imbalance Sex ratio Maternal age Paternal age |
| title | Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities |
| title_full | Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities |
| title_fullStr | Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities |
| title_full_unstemmed | Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities |
| title_short | Mosaicism for structural non-centromeric autosomal rearrangement in prenatal diagnoses: evidence for sex-specific selection against chromosomal abnormalities |
| title_sort | mosaicism for structural non centromeric autosomal rearrangement in prenatal diagnoses evidence for sex specific selection against chromosomal abnormalities |
| topic | Segmental somatic mosaicism Non-centromeric autosomal rearrangement Genomic imbalance Sex ratio Maternal age Paternal age |
| url | http://link.springer.com/article/10.1186/s13039-017-0346-0 |
| work_keys_str_mv | AT nataliavkovaleva mosaicismforstructuralnoncentromericautosomalrearrangementinprenataldiagnosesevidenceforsexspecificselectionagainstchromosomalabnormalities AT philipdcotter mosaicismforstructuralnoncentromericautosomalrearrangementinprenataldiagnosesevidenceforsexspecificselectionagainstchromosomalabnormalities |