Submissions for variant NM_004004.6(GJB2):c.-6T>A (rs148136545)

Total submissions: 9

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
Laboratory for Molecular Medicine,Partners HealthCare Personalized Medicine	RCV000037809	SCV000061471	benign	not specified	2012-05-15	criteria provided, single submitter	clinical testing	-6T>A in Exon 02 of GJB2: This variant is not expected to have clinical signific ance because it has been identified in 1.5% (55/3738) of African American chromo somes from a broad population by the NHLBI Exome Sequencing Project (http://evs. gs.washington.edu/EVS; dbSNP rs148136545) and has been reported as benign based on an equal occurance in cases and controls (Tang 2006, Al-Qahtani, 2010, Shan 2 010).
EGL Genetic Diagnostics, Eurofins Clinical Diagnostics	RCV000037809	SCV000331239	benign	not specified	2016-05-31	criteria provided, single submitter	clinical testing
Illumina Clinical Services Laboratory,Illumina	RCV000351365	SCV000383052	benign	Hystrix-like ichthyosis with deafness	2018-01-13	criteria provided, single submitter	clinical testing	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
Illumina Clinical Services Laboratory,Illumina	RCV000311687	SCV000383054	uncertain significance	Deafness, autosomal recessive 1A	2018-01-13	criteria provided, single submitter	clinical testing	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Illumina Clinical Services Laboratory,Illumina	RCV000336963	SCV000383055	benign	Deafness, autosomal dominant 3a	2018-01-13	criteria provided, single submitter	clinical testing	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
Integrated Genetics/Laboratory Corporation of America	RCV000037809	SCV000698271	benign	not specified	2019-01-08	criteria provided, single submitter	clinical testing	Variant summary: GJB2 c.-6T>A is located in the untranslated mRNA region upstream of the initiation codon. The variant allele was found at a frequency of 0.0012 in 275934 control chromosomes, predominantly at a frequency of 0.012 within the African subpopulation in the gnomAD database, including 3 homozygotes. The observed variant frequency within African control individuals in the gnomAD database is approximately 36-fold of the estimated maximal expected allele frequency for a pathogenic variant in GJB2 causing Non-Syndromic Hearing Loss phenotype (0.00034), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African origin. The variant, c.-6T>A, has been reported in the literature in individuals affected with Non-Syndromic Hearing Loss, but also in controls (Gasmelseed_2004, Tang_2006, Shan_2010, Bosch_2014) and is considered by multiple authors a non-pathogenic common variant. These report(s) do not provide unequivocal conclusions about association of the variant with Non-Syndromic Hearing Loss. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two ClinVar submissions from other clinical diagnostic laboratories (evaluation after 2014) cite the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as benign.
ARUP Laboratories, Molecular Genetics and Genomics,ARUP Laboratories	RCV000586780	SCV000885511	benign	not provided	2017-08-30	criteria provided, single submitter	clinical testing
Athena Diagnostics Inc	RCV000586780	SCV001143675	benign	not provided	2019-02-11	criteria provided, single submitter	clinical testing
Molecular Genetics Laboratory,BC Children's and BC Women's Hospitals	RCV001374657	SCV001571588	benign	nonsyndromic sensorineural hearing loss	2021-03-04	no assertion criteria provided	clinical testing