A homozygous Gly470Ala variant in PEX6 causes severe Zellweger spectrum disorder

Author:

Galarreta Carolina I.1ORCID,Wong Karen2,Carmichael Jason1,Woods Jeremy1,Tise Christina G.3ORCID,Niehaus Annie D.3,Schildt Alison J.3,Verscaj Courtney P.3,Cusmano‐Ozog Kristina P.4

Affiliation:

1. Medical Genetics and Metabolism Department Valley Children's Hospital Madera California USA

2. Department of Pediatrics Valley Children's Hospital Madera California USA

3. Division of Medical Genetics, Department of Pediatrics Lucile Packard Children's Hospital and Stanford University Stanford California USA

4. Department of Pathology Stanford University Stanford California USA

Abstract

AbstractZellweger spectrum disorder (ZSD) is a group of autosomal recessive disorders caused by biallelic pathogenic variants in any one of the 13 PEX genes essential for peroxisomal biogenesis. We report a cohort of nine infants who presented at birth with severe neonatal features suggestive of ZSD and found to be homozygous for a variant in PEX6 (NM_000287.4:c.1409G > C[p.Gly470Ala]). All were of Mixtec ancestry and identified by the California Newborn Screening (NBS) Program to have elevated C26:0‐lysophosphatidylcholine but no reportable variants in ABCD1. The clinical and biochemical features of this cohort are described within. Gly470Ala may represent a founder variant in the Mixtec population of Central California. ZSD should be considered in patients who present at birth with severe hypotonia and enlarged fontanelles, especially in the setting of an abnormal NBS, Mixtec ancestry, or family history of infant death. There is a need to further characterize the natural history of ZSD, the Gly470Ala variant, and expand upon possible genotype–phenotype correlations.

Publisher

Wiley

Subject

Genetics (clinical),Genetics

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