PIGG variant pathogenicity assessment reveals characteristic features within 19 families

Camille Tremblay-Laganière; Reza Maroofian; Thi Tuyet Mai Nguyen; Ehsan Ghayoor Karimiani; Salman Kirmani; Fizza Akbar; Shahnaz Ibrahim; Bushra Afroze; Mohammad Doosti; Farah Ashrafzadeh; Meisam Babaei; Stephanie Efthymiou; Marilena Christoforou; Tipu Sultan; Roger L. Ladda; Heather M. McLaughlin; Rebecca Truty; Sonal Mahida; Julie S. Cohen; Kristin Baranano; Fatima Y. Ismail; Millan S. Patel; Anna Lehman; Andrew C. Edmondson; Amanda Nagy; Melissa A. Walker; Saadet Mercimek-Andrews; Yuta Maki; Rani Sachdev; Rebecca Macintosh; Elizabeth E. Palmer; Grazia M.S. Mancini; Tahsin Stefan Barakat; Robert Steinfeld; Christina T. Rüsch; Georg M. Stettner; Matias Wagner; Saskia B. Wortmann; Usha Kini; Angela F. Brady; Karen L. Stals; Naila Ismayilova; Sian Ellard; Danilo Bernardo; Kimberly Nugent; Scott D. McLean; Stylianos E. Antonarakis; Henry Houlden; Taroh Kinoshita; Philippe M. Campeau; Yoshiko Murakami

doi:10.1038/s41436-021-01215-9

PIGG variant pathogenicity assessment reveals characteristic features within 19 families

Camille Tremblay-Laganière, Reza Maroofian, Thi Tuyet Mai Nguyen, Ehsan Ghayoor Karimiani, Salman Kirmani, Fizza Akbar, Shahnaz Ibrahim, Bushra Afroze, Mohammad Doosti, Farah Ashrafzadeh, Meisam Babaei, Stephanie Efthymiou, Marilena Christoforou, Tipu Sultan, Roger L. Ladda, Heather M. McLaughlin, Rebecca Truty, Sonal Mahida, Julie S. Cohen, Kristin BarananoFatima Y. Ismail, Millan S. Patel, Anna Lehman, Andrew C. Edmondson, Amanda Nagy, Melissa A. Walker, Saadet Mercimek-Andrews, Yuta Maki, Rani Sachdev, Rebecca Macintosh, Elizabeth E. Palmer, Grazia M.S. Mancini, Tahsin Stefan Barakat, Robert Steinfeld, Christina T. Rüsch, Georg M. Stettner, Matias Wagner, Saskia B. Wortmann, Usha Kini, Angela F. Brady, Karen L. Stals, Naila Ismayilova, Sian Ellard, Danilo Bernardo, Kimberly Nugent, Scott D. McLean, Stylianos E. Antonarakis, Henry Houlden, Taroh Kinoshita, Philippe M. Campeau, Yoshiko Murakami

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Abstract

Purpose: Phosphatidylinositol Glycan Anchor Biosynthesis, class G (PIGG) is an ethanolamine phosphate transferase catalyzing the modification of glycosylphosphatidylinositol (GPI). GPI serves as an anchor on the cell membrane for surface proteins called GPI-anchored proteins (GPI-APs). Pathogenic variants in genes involved in the biosynthesis of GPI cause inherited GPI deficiency (IGD), which still needs to be further characterized. Methods: We describe 22 individuals from 19 unrelated families with biallelic variants in PIGG. We analyzed GPI-AP surface levels on granulocytes and fibroblasts for three and two individuals, respectively. We demonstrated enzymatic activity defects for PIGG variants in vitro in a PIGG/PIGO double knockout system. Results: Phenotypic analysis of reported individuals reveals shared PIGG deficiency–associated features. All tested GPI-APs were unchanged on granulocytes whereas CD73 level in fibroblasts was decreased. In addition to classic IGD symptoms such as hypotonia, intellectual disability/developmental delay (ID/DD), and seizures, individuals with PIGG variants of null or severely decreased activity showed cerebellar atrophy, various neurological manifestations, and mitochondrial dysfunction, a feature increasingly recognized in IGDs. Individuals with mildly decreased activity showed autism spectrum disorder. Conclusion: This in vitro system is a useful method to validate the pathogenicity of variants in PIGG and to study PIGG physiological functions.

Original language	English
Pages (from-to)	1873-1881
Number of pages	9
Journal	Genetics in Medicine
Volume	23
Issue number	10
DOIs	https://doi.org/10.1038/s41436-021-01215-9
Publication status	Published - Oct 2021

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Tremblay-Laganière, C., Maroofian, R., Nguyen, T. T. M., Karimiani, E. G., Kirmani, S., Akbar, F., Ibrahim, S., Afroze, B., Doosti, M., Ashrafzadeh, F., Babaei, M., Efthymiou, S., Christoforou, M., Sultan, T., Ladda, R. L., McLaughlin, H. M., Truty, R., Mahida, S., Cohen, J. S., ... Murakami, Y. (2021). PIGG variant pathogenicity assessment reveals characteristic features within 19 families. Genetics in Medicine, 23(10), 1873-1881. https://doi.org/10.1038/s41436-021-01215-9

@article{c79f12f115af4622821199621dae7990,

title = "PIGG variant pathogenicity assessment reveals characteristic features within 19 families",

abstract = "Purpose: Phosphatidylinositol Glycan Anchor Biosynthesis, class G (PIGG) is an ethanolamine phosphate transferase catalyzing the modification of glycosylphosphatidylinositol (GPI). GPI serves as an anchor on the cell membrane for surface proteins called GPI-anchored proteins (GPI-APs). Pathogenic variants in genes involved in the biosynthesis of GPI cause inherited GPI deficiency (IGD), which still needs to be further characterized. Methods: We describe 22 individuals from 19 unrelated families with biallelic variants in PIGG. We analyzed GPI-AP surface levels on granulocytes and fibroblasts for three and two individuals, respectively. We demonstrated enzymatic activity defects for PIGG variants in vitro in a PIGG/PIGO double knockout system. Results: Phenotypic analysis of reported individuals reveals shared PIGG deficiency–associated features. All tested GPI-APs were unchanged on granulocytes whereas CD73 level in fibroblasts was decreased. In addition to classic IGD symptoms such as hypotonia, intellectual disability/developmental delay (ID/DD), and seizures, individuals with PIGG variants of null or severely decreased activity showed cerebellar atrophy, various neurological manifestations, and mitochondrial dysfunction, a feature increasingly recognized in IGDs. Individuals with mildly decreased activity showed autism spectrum disorder. Conclusion: This in vitro system is a useful method to validate the pathogenicity of variants in PIGG and to study PIGG physiological functions.",

author = "Camille Tremblay-Lagani{\`e}re and Reza Maroofian and Nguyen, {Thi Tuyet Mai} and Karimiani, {Ehsan Ghayoor} and Salman Kirmani and Fizza Akbar and Shahnaz Ibrahim and Bushra Afroze and Mohammad Doosti and Farah Ashrafzadeh and Meisam Babaei and Stephanie Efthymiou and Marilena Christoforou and Tipu Sultan and Ladda, {Roger L.} and McLaughlin, {Heather M.} and Rebecca Truty and Sonal Mahida and Cohen, {Julie S.} and Kristin Baranano and Ismail, {Fatima Y.} and Patel, {Millan S.} and Anna Lehman and Edmondson, {Andrew C.} and Amanda Nagy and Walker, {Melissa A.} and Saadet Mercimek-Andrews and Yuta Maki and Rani Sachdev and Rebecca Macintosh and Palmer, {Elizabeth E.} and Mancini, {Grazia M.S.} and Barakat, {Tahsin Stefan} and Robert Steinfeld and R{\"u}sch, {Christina T.} and Stettner, {Georg M.} and Matias Wagner and Wortmann, {Saskia B.} and Usha Kini and Brady, {Angela F.} and Stals, {Karen L.} and Naila Ismayilova and Sian Ellard and Danilo Bernardo and Kimberly Nugent and McLean, {Scott D.} and Antonarakis, {Stylianos E.} and Henry Houlden and Taroh Kinoshita and Campeau, {Philippe M.} and Yoshiko Murakami",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to the American College of Medical Genetics and Genomics.",

year = "2021",

month = oct,

doi = "10.1038/s41436-021-01215-9",

language = "English",

volume = "23",

pages = "1873--1881",

journal = "Genetics in Medicine",

issn = "1098-3600",

publisher = "Elsevier BV",

number = "10",

}

Tremblay-Laganière, C, Maroofian, R, Nguyen, TTM, Karimiani, EG, Kirmani, S , Akbar, F, Ibrahim, S, Afroze, B, Doosti, M, Ashrafzadeh, F, Babaei, M, Efthymiou, S, Christoforou, M, Sultan, T, Ladda, RL, McLaughlin, HM, Truty, R, Mahida, S, Cohen, JS, Baranano, K, Ismail, FY, Patel, MS, Lehman, A, Edmondson, AC, Nagy, A, Walker, MA, Mercimek-Andrews, S, Maki, Y, Sachdev, R, Macintosh, R, Palmer, EE, Mancini, GMS, Barakat, TS, Steinfeld, R, Rüsch, CT, Stettner, GM, Wagner, M, Wortmann, SB, Kini, U, Brady, AF, Stals, KL, Ismayilova, N, Ellard, S, Bernardo, D, Nugent, K, McLean, SD, Antonarakis, SE, Houlden, H, Kinoshita, T, Campeau, PM & Murakami, Y 2021, 'PIGG variant pathogenicity assessment reveals characteristic features within 19 families', Genetics in Medicine, vol. 23, no. 10, pp. 1873-1881. https://doi.org/10.1038/s41436-021-01215-9

TY - JOUR

T1 - PIGG variant pathogenicity assessment reveals characteristic features within 19 families

AU - Tremblay-Laganière, Camille

AU - Maroofian, Reza

AU - Nguyen, Thi Tuyet Mai

AU - Karimiani, Ehsan Ghayoor

AU - Kirmani, Salman

AU - Akbar, Fizza

AU - Ibrahim, Shahnaz

AU - Afroze, Bushra

AU - Doosti, Mohammad

AU - Ashrafzadeh, Farah

AU - Babaei, Meisam

AU - Efthymiou, Stephanie

AU - Christoforou, Marilena

AU - Sultan, Tipu

AU - Ladda, Roger L.

AU - McLaughlin, Heather M.

AU - Truty, Rebecca

AU - Mahida, Sonal

AU - Cohen, Julie S.

AU - Baranano, Kristin

AU - Ismail, Fatima Y.

AU - Patel, Millan S.

AU - Lehman, Anna

AU - Edmondson, Andrew C.

AU - Nagy, Amanda

AU - Walker, Melissa A.

AU - Mercimek-Andrews, Saadet

AU - Maki, Yuta

AU - Sachdev, Rani

AU - Macintosh, Rebecca

AU - Palmer, Elizabeth E.

AU - Mancini, Grazia M.S.

AU - Barakat, Tahsin Stefan

AU - Steinfeld, Robert

AU - Rüsch, Christina T.

AU - Stettner, Georg M.

AU - Wagner, Matias

AU - Wortmann, Saskia B.

AU - Kini, Usha

AU - Brady, Angela F.

AU - Stals, Karen L.

AU - Ismayilova, Naila

AU - Ellard, Sian

AU - Bernardo, Danilo

AU - Nugent, Kimberly

AU - McLean, Scott D.

AU - Antonarakis, Stylianos E.

AU - Houlden, Henry

AU - Kinoshita, Taroh

AU - Campeau, Philippe M.

AU - Murakami, Yoshiko

PY - 2021/10

Y1 - 2021/10

N2 - Purpose: Phosphatidylinositol Glycan Anchor Biosynthesis, class G (PIGG) is an ethanolamine phosphate transferase catalyzing the modification of glycosylphosphatidylinositol (GPI). GPI serves as an anchor on the cell membrane for surface proteins called GPI-anchored proteins (GPI-APs). Pathogenic variants in genes involved in the biosynthesis of GPI cause inherited GPI deficiency (IGD), which still needs to be further characterized. Methods: We describe 22 individuals from 19 unrelated families with biallelic variants in PIGG. We analyzed GPI-AP surface levels on granulocytes and fibroblasts for three and two individuals, respectively. We demonstrated enzymatic activity defects for PIGG variants in vitro in a PIGG/PIGO double knockout system. Results: Phenotypic analysis of reported individuals reveals shared PIGG deficiency–associated features. All tested GPI-APs were unchanged on granulocytes whereas CD73 level in fibroblasts was decreased. In addition to classic IGD symptoms such as hypotonia, intellectual disability/developmental delay (ID/DD), and seizures, individuals with PIGG variants of null or severely decreased activity showed cerebellar atrophy, various neurological manifestations, and mitochondrial dysfunction, a feature increasingly recognized in IGDs. Individuals with mildly decreased activity showed autism spectrum disorder. Conclusion: This in vitro system is a useful method to validate the pathogenicity of variants in PIGG and to study PIGG physiological functions.

AB - Purpose: Phosphatidylinositol Glycan Anchor Biosynthesis, class G (PIGG) is an ethanolamine phosphate transferase catalyzing the modification of glycosylphosphatidylinositol (GPI). GPI serves as an anchor on the cell membrane for surface proteins called GPI-anchored proteins (GPI-APs). Pathogenic variants in genes involved in the biosynthesis of GPI cause inherited GPI deficiency (IGD), which still needs to be further characterized. Methods: We describe 22 individuals from 19 unrelated families with biallelic variants in PIGG. We analyzed GPI-AP surface levels on granulocytes and fibroblasts for three and two individuals, respectively. We demonstrated enzymatic activity defects for PIGG variants in vitro in a PIGG/PIGO double knockout system. Results: Phenotypic analysis of reported individuals reveals shared PIGG deficiency–associated features. All tested GPI-APs were unchanged on granulocytes whereas CD73 level in fibroblasts was decreased. In addition to classic IGD symptoms such as hypotonia, intellectual disability/developmental delay (ID/DD), and seizures, individuals with PIGG variants of null or severely decreased activity showed cerebellar atrophy, various neurological manifestations, and mitochondrial dysfunction, a feature increasingly recognized in IGDs. Individuals with mildly decreased activity showed autism spectrum disorder. Conclusion: This in vitro system is a useful method to validate the pathogenicity of variants in PIGG and to study PIGG physiological functions.

UR - http://www.scopus.com/inward/record.url?scp=85107468505&partnerID=8YFLogxK

U2 - 10.1038/s41436-021-01215-9

DO - 10.1038/s41436-021-01215-9

M3 - Article

C2 - 34113002

AN - SCOPUS:85107468505

SN - 1098-3600

VL - 23

SP - 1873

EP - 1881

JO - Genetics in Medicine

JF - Genetics in Medicine

IS - 10

ER -

PIGG variant pathogenicity assessment reveals characteristic features within 19 families

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