ClinVar Miner

Submissions for variant NM_000298.6(PKLR):c.1516G>A (p.Val506Ile) (rs8177988)

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Total submissions: 8
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Center for Pediatric Genomic Medicine,Children's Mercy Hospital and Clinics RCV000224042 SCV000280976 uncertain significance not provided 2015-02-06 criteria provided, single submitter clinical testing Converted during submission to Uncertain significance.
GeneDx RCV000224042 SCV000617805 uncertain significance not provided 2017-10-03 criteria provided, single submitter clinical testing The V506I variant in the PKLR gene, also called PK Mallorca, has been reported previously in the heterozygous state with a second PKLR variant in a patient with PK deficiency (Pissard et al., 2006). The V506I variant was also identified in the heterozygous state in a child with concomitant hereditary spherocytosis and chronic hemolytic anemia who harbored V506I in trans with variants in hereditary spherocytosis genes; this individual's mother with V506I in the heterozygous state was asymptomatic (Zarza et al., 2000). The V506I variant is observed in 217/30782 (0.7%) alleles from individuals of South African background, including five homozygous individuals, in the ExAC dataset (Lek et al., 2016). The V506I variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position where amino acids with similar properties to Valine are tolerated across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. We interpret V506I as a variant of uncertain significance.
ARUP Laboratories, Molecular Genetics and Genomics,ARUP Laboratories RCV000999757 SCV000885965 uncertain significance none provided 2020-06-30 criteria provided, single submitter clinical testing
Fulgent Genetics,Fulgent Genetics RCV000764981 SCV000896160 uncertain significance Adenosine triphosphate, elevated, of erythrocytes; Pyruvate kinase deficiency of red cells 2018-10-31 criteria provided, single submitter clinical testing
Invitae RCV000224042 SCV001117732 likely benign not provided 2019-12-31 criteria provided, single submitter clinical testing
Illumina Clinical Services Laboratory,Illumina RCV001095923 SCV001252102 likely benign Pyruvate kinase deficiency of red cells 2017-04-27 criteria provided, single submitter clinical testing This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign.
Mayo Clinic Laboratories, Mayo Clinic RCV000224042 SCV001713041 uncertain significance not provided 2021-01-12 criteria provided, single submitter clinical testing
Department of Pathology and Laboratory Medicine,Sinai Health System RCV000224042 SCV001549750 uncertain significance not provided no assertion criteria provided clinical testing The PKLR p.Val475Ile variant was identified in 1 of 112 proband chromosomes (frequency: 0.0089) from individuals or families with pyruvate-kinase deficiency (Pissard_2006_PMID:16704447). The variant was also identified in the heterozygous state in a patient with partial red blood cell pyruvate-kinase deficiency concomitant hereditary spherocytosis and chronic hemolytic anemia; the patient's unaffected mother also carried the V475I variant (Zarza_2000_PMID:10702808). The variant was identified in dbSNP (ID: rs8177988), ClinVar (classified as a VUS by ARUP Laboratories, GeneDx, Fulgent Genetics and Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics) and LOVD 3.0 (classified as a VUS and pathogenic). The variant was identified in control databases in 1201 of 282864 chromosomes (5 homozygous) at a frequency of 0.004246 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: South Asian in 221 of 30616 chromosomes (freq: 0.007218), European (non-Finnish) in 769 of 129180 chromosomes (freq: 0.005953), Other in 37 of 7224 chromosomes (freq: 0.005122), Latino in 93 of 35436 chromosomes (freq: 0.002624), Ashkenazi Jewish in 21 of 10368 chromosomes (freq: 0.002025), European (Finnish) in 31 of 25120 chromosomes (freq: 0.001234) and African in 29 of 24966 chromosomes (freq: 0.001162); it was not observed in the East Asian population. The p.Val475 residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; however, this information is not predictive enough to rule out pathogenicity. The variant occurs outside of the splicing consensus sequence and 3 of 4 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance.

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