“…Genetic disorders may also lead to NIHF and include a wide spectrum of diseases, including chromosomal aneuplodies (trisomies, monosomy X, triploidy), hematological diseases (α-thalassemia), monogenic syndromes (RASopathies, Kabuki syndrome), inborn errors of metabolism (lysosomal storage disease) and lymphatic dysplasia (Bellini et al, 2015;Mardy et al, 2019;McPherson, 2019;Moreno et al, 2013;Quinlan-Jones et al, 2019;Weissbach et al, 2019). Few familial cases of nonimmune hydrops fetalis have been described and in some of the cases with lymphatic dysplasia and/or lymphangiectasia bi-allelic variants in CCBE1, ADAMTS3, FAT4, CAL-CRL, and PIEZO1 have been reported (Alders et al, 2009;Alders et al, 2014;Brouillard et al, 2017;Datkhaeva et al, 2018;Delabaere et al, 2008;Fotiou et al, 2015;Jacquemont, Barbarot, Boceno, Stalder, & David, 2000;Mackie et al, 2018;Njolstad, Reigstad, Westby, & Espeland, 1998;Stevenson, Pysher, Ward, & Carey, 2006;Wieacker, Muschke, Pollak, & Muller, 2005). However, even with conventional and state-of-the-art diagnostics like exome sequencing an underlying genetic defect remains undetermined in the majority of infants with hydrops (Lord et al, 2019;Yates et al, 2017).…”