ClinVar Miner

Submissions for variant NM_000518.4(HBB):c.-102G>T

dbSNP: rs1554918277
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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV000587333 SCV000697072 uncertain significance not provided 2017-06-30 criteria provided, single submitter clinical testing Variant summary: The HBB c.-102G>T variant (alternatively also known as -52G>T) results into substitution of a non-conserved nucleotide with MutationTaster predicting a benign outcome. The variant is located in between CCAAT and TATA elements in the HBB gene promoter. This area is known as the direct repeat element (DRE) region, and has been shown to be an important regulator element for transcription. Another variant c.-100G>A has been identified in this region in association with beta thalassemia (classified as VUS-possibly pathogenic by LCA). Although the variant position/region is not covered in ExAC and NHLBI ESP, it is covered in gnomAD database and is absent in 30976 control chromosomes. This variant has been reported in two unrelated Omani subjects in compound heterozygous state with Hb S (i.e. p.Glu7Val) with possible indication of a very mild beta+ thalassemia (Hassan_2014). Other two subjects were heterozygous carrier for this variant, who also carried c.-alfa3.7 in homozygous and heterozygous state, respectively, had borderline/elevated Hb A2, alfa-thalassemia (alfa-thal) and hypochromic red cell indices. Taken together, this variant is classified as VUS-possibly pathogenic.

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