Background Primary Hypobetalipoproteinemias (HBL) are a group of dominant and recessive monogenic genetic disorders caused by mutations in APOB, PCSK9, ANGPTL3, MTTP, Sar1b genes and characterized by plasma levels of total cholesterol (TC), low density lipoprotein-cholesterol (LDL-C) and apolipoprotein B (apoB) below the 5th percentile of the distribution in a given population. Mutations in the candidate genes account only for a small proportion of subjects with HBL suggesting a role for a polygenic contribution to the low cholesterol phenotype. Objective To explore the complex genetic architecture of HBL we compared two polygenic risk scores in order to assess the role of the polygenic burden and the differences in the clinical phenotype between monogenic and polygenic HBL; we studied a cohort of 170 subjects with primary HBL referred over a 25-year period to 2 Italian reference centers have been studied. Methods The genetic analyses have been based on: Sanger sequencing, in-house NGS customized panel and two scores, PRS1 and PRS2 for the polygenic burden. Results Sixty 60 (35%) and 63 (37%) subjects had a monogenic and polygenic HBL respectively. LDL-C plasma levels were significantly lower in monogenic HBL (30.87 ± 3.12 mg/dl) compared with the non-monogenic HBL (42.80 ± 2.18 mg/dl) (p<0.002) with no differences in the percentage of fatty liver. Conclusion Only PRS1 is effective in detecting polygenic HBL while PRS2 does not improve the polygenic diagnosis.

Comparison of two polygenic risk score to identify non-monogenic primary hypocholesterolemias in a large cohort of Italian hypocholesterolemic subjects / Cefalù, Angelo B.; Spina, Rossella; Noto, Davide; Rabacchi, Claudio; Giammanco, Antonina; Simone, Maria Luisa; Brucato, Federica; Scrimali, Chiara; Gueli-Alletti, Maria Grazia; Barbagallo, Carlo M.; Tarugi, Patrizia; Averna, Maurizio R.. - In: JOURNAL OF CLINICAL LIPIDOLOGY. - ISSN 1933-2874. - 16:4(2022), pp. 530-537. [10.1016/j.jacl.2022.04.009]

Comparison of two polygenic risk score to identify non-monogenic primary hypocholesterolemias in a large cohort of Italian hypocholesterolemic subjects

Rabacchi, Claudio;Simone, Maria Luisa;Tarugi, Patrizia
;
2022

Abstract

Background Primary Hypobetalipoproteinemias (HBL) are a group of dominant and recessive monogenic genetic disorders caused by mutations in APOB, PCSK9, ANGPTL3, MTTP, Sar1b genes and characterized by plasma levels of total cholesterol (TC), low density lipoprotein-cholesterol (LDL-C) and apolipoprotein B (apoB) below the 5th percentile of the distribution in a given population. Mutations in the candidate genes account only for a small proportion of subjects with HBL suggesting a role for a polygenic contribution to the low cholesterol phenotype. Objective To explore the complex genetic architecture of HBL we compared two polygenic risk scores in order to assess the role of the polygenic burden and the differences in the clinical phenotype between monogenic and polygenic HBL; we studied a cohort of 170 subjects with primary HBL referred over a 25-year period to 2 Italian reference centers have been studied. Methods The genetic analyses have been based on: Sanger sequencing, in-house NGS customized panel and two scores, PRS1 and PRS2 for the polygenic burden. Results Sixty 60 (35%) and 63 (37%) subjects had a monogenic and polygenic HBL respectively. LDL-C plasma levels were significantly lower in monogenic HBL (30.87 ± 3.12 mg/dl) compared with the non-monogenic HBL (42.80 ± 2.18 mg/dl) (p<0.002) with no differences in the percentage of fatty liver. Conclusion Only PRS1 is effective in detecting polygenic HBL while PRS2 does not improve the polygenic diagnosis.
2022
16
4
530
537
Comparison of two polygenic risk score to identify non-monogenic primary hypocholesterolemias in a large cohort of Italian hypocholesterolemic subjects / Cefalù, Angelo B.; Spina, Rossella; Noto, Davide; Rabacchi, Claudio; Giammanco, Antonina; Simone, Maria Luisa; Brucato, Federica; Scrimali, Chiara; Gueli-Alletti, Maria Grazia; Barbagallo, Carlo M.; Tarugi, Patrizia; Averna, Maurizio R.. - In: JOURNAL OF CLINICAL LIPIDOLOGY. - ISSN 1933-2874. - 16:4(2022), pp. 530-537. [10.1016/j.jacl.2022.04.009]
Cefalù, Angelo B.; Spina, Rossella; Noto, Davide; Rabacchi, Claudio; Giammanco, Antonina; Simone, Maria Luisa; Brucato, Federica; Scrimali, Chiara; Gueli-Alletti, Maria Grazia; Barbagallo, Carlo M.; Tarugi, Patrizia; Averna, Maurizio R.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1276640
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