chr15-78619005-C-G

Variant names:

• chr15-78619005-C-G
• rs71581736
• NM_000743.5:c.83-90G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000743.5(CHRNA3):​c.83-90G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CHRNA3 NM_000743.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.130
• Publications: 3 publications found

Genes affected

CHRNA3 (HGNC:1957): (cholinergic receptor nicotinic alpha 3 subunit) This locus encodes a member of the nicotinic acetylcholine receptor family of proteins. Members of this family of proteins form pentameric complexes comprised of both alpha and beta subunits. This locus encodes an alpha-type subunit, as it contains characteristic adjacent cysteine residues. The encoded protein is a ligand-gated ion channel that likely plays a role in neurotransmission. Polymorphisms in this gene have been associated with an increased risk of smoking initiation and an increased susceptibility to lung cancer. Alternatively spliced transcript variants have been described. [provided by RefSeq, Nov 2009]

CHRNA3 Gene-Disease associations (from GenCC):

• urinary bladder, atony of

  Inheritance: AR Classification: STRONG Submitted by: Ambry Genetics, G2P

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNA3	NM_000743.5	c.83-90G>C		intron_variant	Intron 1 of 5	ENST00000326828.6	NP_000734.2
CHRNA3	NM_001166694.2	c.83-90G>C		intron_variant	Intron 1 of 5		NP_001160166.1
CHRNA3	NR_046313.2	n.285-90G>C		intron_variant	Intron 1 of 7
CHRNA3	XM_006720382.4	c.-119-90G>C		intron_variant	Intron 1 of 5		XP_006720445.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHRNA3	ENST00000326828.6	c.83-90G>C		intron_variant	Intron 1 of 5	1	NM_000743.5	ENSP00000315602.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1271134 Hom.: 0 Cov.: 18 AF XY: 0.00 AC XY: 0 AN XY: 635696

African (AFR) AF: 0.00 AC: 0 AN: 29606

American (AMR) AF: 0.00 AC: 0 AN: 39898

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21926

East Asian (EAS) AF: 0.00 AC: 0 AN: 38790

South Asian (SAS) AF: 0.00 AC: 0 AN: 75190

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40424

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3676

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 967824

Other (OTH) AF: 0.00 AC: 0 AN: 53800

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 4

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	4.3
DANN	Benign	0.47
PhyloP100		0.13
PromoterAI		-0.010	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs71581736; hg19: chr15-78911347;