Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM5
The NM_000414.4(HSD17B4):āc.1213C>Gā(p.Leu405Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000965 in 1,451,268 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L405P) has been classified as Pathogenic.
HSD17B4 (HGNC:5213): (hydroxysteroid 17-beta dehydrogenase 4) The protein encoded by this gene is a bifunctional enzyme that is involved in the peroxisomal beta-oxidation pathway for fatty acids. It also acts as a catalyst for the formation of 3-ketoacyl-CoA intermediates from both straight-chain and 2-methyl-branched-chain fatty acids. Defects in this gene that affect the peroxisomal fatty acid beta-oxidation activity are a cause of D-bifunctional protein deficiency (DBPD). An apparent pseudogene of this gene is present on chromosome 8. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, May 2014]
Loss of catalytic residue at L405 (P = 0.0651);.;Loss of catalytic residue at L405 (P = 0.0651);.;.;Loss of catalytic residue at L405 (P = 0.0651);.;.;.;.;.;