chr8-27463708-G-A
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Variant summary
Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS2
The NM_000742.4(CHRNA2):c.735C>T(p.Tyr245Tyr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,461,588 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).
Frequency
Genomes: 𝑓 0.0 ( 0 hom., cov: 31)
Exomes 𝑓: 0.0000041 ( 0 hom. )
Failed GnomAD Quality Control
Consequence
CHRNA2
NM_000742.4 synonymous
NM_000742.4 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: -0.751
Genes affected
CHRNA2 (HGNC:1956): (cholinergic receptor nicotinic alpha 2 subunit) Nicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels formed by a pentameric arrangement of alpha and beta subunits to create distinct muscle and neuronal receptors. Neuronal receptors are found throughout the peripheral and central nervous system where they are involved in fast synaptic transmission. This gene encodes an alpha subunit that is widely expressed in the brain. The proposed structure for nAChR subunits is a conserved N-terminal extracellular domain followed by three conserved transmembrane domains, a variable cytoplasmic loop, a fourth conserved transmembrane domain, and a short C-terminal extracellular region. Mutations in this gene cause autosomal dominant nocturnal frontal lobe epilepsy type 4. Single nucleotide polymorphisms (SNPs) in this gene have been associated with nicotine dependence. [provided by RefSeq, Nov 2009]
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ACMG classification
Classification made for transcript
Verdict is Benign. Variant got -17 ACMG points.
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.72).
BP6
Variant 8-27463708-G-A is Benign according to our data. Variant chr8-27463708-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 543548.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
BP7
Synonymous conserved (PhyloP=-0.751 with no splicing effect.
BS2
High AC in GnomAdExome4 at 6 AD gene.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
CHRNA2 | NM_000742.4 | c.735C>T | p.Tyr245Tyr | synonymous_variant | 6/7 | ENST00000407991.3 | NP_000733.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
CHRNA2 | ENST00000407991.3 | c.735C>T | p.Tyr245Tyr | synonymous_variant | 6/7 | 5 | NM_000742.4 | ENSP00000385026.1 |
Frequencies
GnomAD3 genomes AF: 0.00 AC: 0AN: 128746Hom.: 0 Cov.: 31 FAILED QC
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GnomAD3 exomes AF: 0.0000119 AC: 3AN: 251362Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135862
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GnomAD4 exome AF: 0.00000411 AC: 6AN: 1461588Hom.: 0 Cov.: 33 AF XY: 0.00000413 AC XY: 3AN XY: 727066
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GnomAD4 genome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0AN: 128746Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0AN XY: 63056
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ClinVar
Significance: Likely benign
Submissions summary: Benign:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Autosomal dominant nocturnal frontal lobe epilepsy Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Dec 05, 2017 | - - |
not provided Benign:1
Likely benign, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Nov 01, 2022 | CHRNA2: BP4, BP7 - |
Computational scores
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at