ClinVar

Description

The c.-156C>T variant is located in the 5' untranslated region (5’ UTR) of the LDLR gene. This variant results from a C to T substitution 156 nucleotides upstream from the first translated codon, and is located in the sterol regulatory element (SRE-1). This variant was reported to occur in the homozygous state in an individual with features consistent with homozygous familial hypercholesterolemia (FH) including severe, early onset coronary artery disease, LDL-C of 377mg/dL, Achilles tendon xanthoma, periorbital xanthelasma, and sudden death who also had a family history of heart attack, sudden death, and hypercholesterolemia; a reportedly less severely affected sibling was heterozygous for the variant (Dedoussis GV et al. Hum. Mutat., 2004 Mar;23:285-6). This has also been detected in the heterozygous state in individuals with features consistent with heterozygous FH or individuals from FH cohorts; however, in some cases clinical details were limited (van der Graaf A et al. Circulation. 2011 Mar;123(11):1167-73; Durst R et al. Atherosclerosis, 2017 02;257:55-63; Leren TP et al. Atherosclerosis. 2021 Apr;322:61-66). This nucleotide position is highly conserved in available vertebrate species. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic.