The NM_000152.5:c.736del (p.Leu246PhefsTer22) variant in GAA is a frameshift variant predicted to cause a premature stop codon leading to nonsense mediated decay in a gene in which loss-of-function is an established disease mechanism (PVS1). The variant is absent in gnomAD v2.1.1. (PM2_Supporting). One patient with limb girdle muscular dystrophy was reported to be compound heterozygous for c.736delC and another variant in GAA that has been classified by the ClinGen LD VCEP as pathogenic, c.546G>A; the phase is unknown. However, because no aditional information is available to support the diagnosis of Pompe disease, such as GAA deficiency, there is insufficient evidence to apply PM3 at this time. . There is a ClinVar entry for this variant (Variation ID: 288505. In summary, this variant meets the criteria to be classified as likely pathogenic for Pompe disease. GAA-specific ACMG/AMP criteria applied, as specified by the ClinGen LSD VCEP Specifications Version 2.0): PVS1, PM2_Supporting. (Classification approved by the ClinGen Lysosomal Diseases VCEP on July 18, 2023).