Inverse PCR to perform long-distance haplotyping: main applications to improve preimplantation genetic diagnosis in hemophilia
Among other applications of long-distance haplotype phasing in clinical genetics, determination of linked DNA markers as surrogate for problematic structural variants (e.g., repeat-mediated rearrangements) is essential to perform diagnosis from low-quality DNA samples. We describe a next-of-kin-inde...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/103574 |
| Acceso en línea: | http://hdl.handle.net/11336/103574 |
| Access Level: | acceso abierto |
| Palabra clave: | F8 HEMA STR INV22 https://purl.org/becyt/ford/3.1 https://purl.org/becyt/ford/3 |
| Sumario: | Among other applications of long-distance haplotype phasing in clinical genetics, determination of linked DNA markers as surrogate for problematic structural variants (e.g., repeat-mediated rearrangements) is essential to perform diagnosis from low-quality DNA samples. We describe a next-of-kin-independent (physical) phasing approach based on inverse-PCR (iPCR) paired-end amplification (PI). This method enables typing the multialleles of the short tandem repeat (STR) F8Int21[CA]n at the F8-intron 21, as a surrogate DNA marker for the F8-intron 22 inversion (Inv22), the hemophilia A-causative hotspot, within the transmitted haplotype in informative carriers. We provide proof-of-concept by blindly validating the PI approach in 15 carrier mother/affected-son duos. Every F8Int21[CA]n STR allele determined in phase with the Inv22 allele in the female carriers from the informative duos was confirmed in the hemizygous proband (P = 0.00003). A second surrogate STR locus at the F8-IVS22 was obtained by the PI approach improving severe-HA preimplantation genetic diagnosis by augmenting heterozygosity in Inv22 carriers bypassing the requirement for family linkage analysis. The ability of the PI-assay to combine other marker pairs was demonstrated by haplotyping a SNV (F8:c.6118T > C) with a >28kb-distant F8-IVS22 STR. The PI approach has proven flexibility to target different marker pairs and has potential for multiplex characterization of iPCR products by massively parallel sequencing. |
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