Autozygosity-driven exome analysis has been shown effective for identification of genes underlying recessive diseases especially in countries of the so-called Greater Middle East (GME), where high consanguinity unravels the phenotypic effects of recessive alleles and large family sizes facilitate homozygosity mapping. In Italy, as in most European countries, consanguinity is estimated low. Nonetheless, consanguineous Italian families are not uncommon in publications of genetic findings and are often key to new associations of genes with rare diseases. We collected 52 patients from 47 consanguineous families with suspected recessive diseases, 29 originated in GME countries and 18 of Italian descent. We performed autozygosity-driven exome analysis by detecting long runs of homozygosity (ROHs > 1.5 Mb) and by prioritizing candidate clinical variants within. We identified a pathogenic synonymous variant that had been previously missed in NARS2 and we increased an initial high diagnostic rate (47%) to 55% by matchmaking our candidate genes and including in the analysis shorter ROHs that may also happen to be autozygous. GME and Italian families contributed to diagnostic yield comparably. We found no significant difference either in the extension of the autozygous genome, or in the distribution of candidate clinical variants between GME and Italian families, while we showed that the average autozygous genome was larger and the mean number of candidate clinical variants was significantly higher (p = 0.003) in mutation-positive than in mutation-negative individuals, suggesting that these features influence the likelihood that the disease is autozygosity-related. We highlight the utility of autozygosity-driven genomic analysis also in countries and/or communities, where consanguinity is not widespread cultural tradition.

Palombo F., Graziano C., Al Wardy N., Nouri N., Marconi C., Magini P., et al. (2020). Autozygosity-driven genetic diagnosis in consanguineous families from Italy and the Greater Middle East. HUMAN GENETICS, 139(11), 1429-1441 [10.1007/s00439-020-02187-7].

Autozygosity-driven genetic diagnosis in consanguineous families from Italy and the Greater Middle East

Palombo F.;Marconi C.;Magini P.;Severi G.;La Morgia C.;Cordelli D. M.;Carelli V.;Pippucci T.;Seri M.
2020

Abstract

Autozygosity-driven exome analysis has been shown effective for identification of genes underlying recessive diseases especially in countries of the so-called Greater Middle East (GME), where high consanguinity unravels the phenotypic effects of recessive alleles and large family sizes facilitate homozygosity mapping. In Italy, as in most European countries, consanguinity is estimated low. Nonetheless, consanguineous Italian families are not uncommon in publications of genetic findings and are often key to new associations of genes with rare diseases. We collected 52 patients from 47 consanguineous families with suspected recessive diseases, 29 originated in GME countries and 18 of Italian descent. We performed autozygosity-driven exome analysis by detecting long runs of homozygosity (ROHs > 1.5 Mb) and by prioritizing candidate clinical variants within. We identified a pathogenic synonymous variant that had been previously missed in NARS2 and we increased an initial high diagnostic rate (47%) to 55% by matchmaking our candidate genes and including in the analysis shorter ROHs that may also happen to be autozygous. GME and Italian families contributed to diagnostic yield comparably. We found no significant difference either in the extension of the autozygous genome, or in the distribution of candidate clinical variants between GME and Italian families, while we showed that the average autozygous genome was larger and the mean number of candidate clinical variants was significantly higher (p = 0.003) in mutation-positive than in mutation-negative individuals, suggesting that these features influence the likelihood that the disease is autozygosity-related. We highlight the utility of autozygosity-driven genomic analysis also in countries and/or communities, where consanguinity is not widespread cultural tradition.
2020
Palombo F., Graziano C., Al Wardy N., Nouri N., Marconi C., Magini P., et al. (2020). Autozygosity-driven genetic diagnosis in consanguineous families from Italy and the Greater Middle East. HUMAN GENETICS, 139(11), 1429-1441 [10.1007/s00439-020-02187-7].
Palombo F.; Graziano C.; Al Wardy N.; Nouri N.; Marconi C.; Magini P.; Severi G.; La Morgia C.; Cantalupo G.; Cordelli D.M.; Gangarossa S.; Al Kindi M...espandi
File in questo prodotto:
File Dimensione Formato  
s00439-020-02187-7.pdf

accesso riservato

Tipo: Versione (PDF) editoriale
Licenza: Licenza per accesso riservato
Dimensione 717.3 kB
Formato Adobe PDF
717.3 kB Adobe PDF   Visualizza/Apri   Contatta l'autore
Palombo_2020_AM.pdf

accesso aperto

Tipo: Postprint
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione - Non commerciale - Non opere derivate (CCBYNCND)
Dimensione 533.2 kB
Formato Adobe PDF
533.2 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/794089
Citazioni
  • ???jsp.display-item.citation.pmc??? 5
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 8
social impact