5-74721215-A-C
Variant summary
Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_StrongBP6_ModerateBS1BS2
The NM_032380.5(GFM2):c.*440T>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000718 in 1,426,670 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).
Frequency
Genomes: 𝑓 0.0036 ( 2 hom., cov: 32)
Exomes 𝑓: 0.00037 ( 4 hom. )
Consequence
GFM2
NM_032380.5 3_prime_UTR
NM_032380.5 3_prime_UTR
Scores
2
Clinical Significance
Conservation
PhyloP100: 0.317
Genes affected
HEXB (HGNC:4879): (hexosaminidase subunit beta) Hexosaminidase B is the beta subunit of the lysosomal enzyme beta-hexosaminidase that, together with the cofactor GM2 activator protein, catalyzes the degradation of the ganglioside GM2, and other molecules containing terminal N-acetyl hexosamines. Beta-hexosaminidase is composed of two subunits, alpha and beta, which are encoded by separate genes. Both beta-hexosaminidase alpha and beta subunits are members of family 20 of glycosyl hydrolases. Mutations in the alpha or beta subunit genes lead to an accumulation of GM2 ganglioside in neurons and neurodegenerative disorders termed the GM2 gangliosidoses. Beta subunit gene mutations lead to Sandhoff disease (GM2-gangliosidosis type II). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2014]
GFM2 (HGNC:29682): (GTP dependent ribosome recycling factor mitochondrial 2) Eukaryotes contain two protein translational systems, one in the cytoplasm and one in the mitochondria. Mitochondrial translation is crucial for maintaining mitochondrial function and mutations in this system lead to a breakdown in the respiratory chain-oxidative phosphorylation system and to impaired maintenance of mitochondrial DNA. This gene encodes one of the mitochondrial translation elongation factors, which is a GTPase that plays a role at the termination of mitochondrial translation by mediating the disassembly of ribosomes from messenger RNA . Its role in the regulation of normal mitochondrial function and in disease states attributed to mitochondrial dysfunction is not known. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2013]
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ACMG classification
Classification made for transcript
Verdict is Benign. Variant got -14 ACMG points.
BP4
?
Computational evidence support a benign effect (BayesDel_noAF=-0.82).
BP6
?
Variant 5-74721215-A-C is Benign according to our data. Variant chr5-74721215-A-C is described in ClinVar as [Likely_benign]. Clinvar id is 354139.Status of the report is criteria_provided_single_submitter, 1 stars.
BS1
?
Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00363 (553/152314) while in subpopulation AFR AF= 0.0128 (534/41582). AF 95% confidence interval is 0.0119. There are 2 homozygotes in gnomad4. There are 268 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
BS2
?
High Homozygotes in GnomAd at 2 AR gene
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
HEXB | NM_000521.4 | c.*40A>C | 3_prime_UTR_variant | 14/14 | ENST00000261416.12 | ||
GFM2 | NM_032380.5 | c.*440T>G | 3_prime_UTR_variant | 21/21 | ENST00000296805.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
HEXB | ENST00000261416.12 | c.*40A>C | 3_prime_UTR_variant | 14/14 | 1 | NM_000521.4 | P1 | ||
GFM2 | ENST00000296805.8 | c.*440T>G | 3_prime_UTR_variant | 21/21 | 1 | NM_032380.5 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00361 AC: 550AN: 152196Hom.: 2 Cov.: 32
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GnomAD3 exomes AF: 0.000938 AC: 234AN: 249540Hom.: 2 AF XY: 0.000754 AC XY: 102AN XY: 135222
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GnomAD4 exome AF: 0.000370 AC: 472AN: 1274356Hom.: 4 Cov.: 18 AF XY: 0.000306 AC XY: 197AN XY: 644318
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ClinVar
Significance: Likely benign
Submissions summary: Benign:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Sandhoff disease Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 13, 2018 | 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 likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. - |
Computational scores
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BayesDel_noAF
Benign
Cadd
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RBP_binding_hub_radar
RBP_regulation_power_radar
Splicing
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Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at