Genetic Variant GNAL:c.723-6594C>G (chr18-11855801-C-G) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBS1BS2

The NM_182978.4(GNAL):c.723-6594C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00211 in 151,950 control chromosomes in the GnomAD database, including 2 homozygotes. 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: 𝑓 0.0021 ( 2 hom., cov: 32)

Consequence

GNAL
NM_182978.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.208

Publications

2 publications found

Variant links:

Genes affected

GNAL (HGNC:4388): (G protein subunit alpha L) This gene encodes a stimulatory G protein alpha subunit which mediates odorant signaling in the olfactory epithelium. This protein couples dopamine type 1 receptors and adenosine A2A receptors and is widely expressed in the central nervous system. Mutations in this gene have been associated with dystonia 25 and this gene is located in a susceptibility region for bipolar disorder and schizophrenia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2013]

GNAL Gene-Disease associations (from GenCC):

dystonia 25
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics

GNAL links:

ENSG00000296678 (HGNC:):

ENSG00000296678 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.91).

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00211 (320/151950) while in subpopulation AFR AF = 0.0075 (310/41356). AF 95% confidence interval is 0.00681. There are 2 homozygotes in GnomAd4. There are 147 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 320 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein
GNAL	NM_182978.4 link	c.723-6594C>G	intron_variant	Intron 5 of 11	ENST00000334049.11	NP_892023.1
GNAL	NM_001369387.1 link	c.492-6594C>G	intron_variant	Intron 5 of 11	ENST00000423027.8	NP_001356316.1
GNAL	NM_001142339.3 link	c.492-6594C>G	intron_variant	Intron 6 of 12		NP_001135811.1
GNAL	NM_001261443.2 link	c.492-6594C>G	intron_variant	Intron 6 of 12		NP_001248372.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNAL	ENST00000334049.11 link	c.723-6594C>G		intron_variant	Intron 5 of 11	1	NM_182978.4	ENSP00000334051.5
GNAL	ENST00000423027.8 link	c.492-6594C>G		intron_variant	Intron 5 of 11	1	NM_001369387.1	ENSP00000408489.2

Frequencies

GnomAD3 genomes

AF:

0.00209

AC:

318

AN:

151832

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00747

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000621

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00144

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome

AF:

0.00211

AC:

320

AN:

151950

Hom.:

Cov.:

AF XY:

0.00198

AC XY:

147

AN XY:

74264

show subpopulations

African (AFR)

AF:

0.00750

AC:

310

AN:

41356

American (AMR)

AF:

0.000131

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5142

South Asian (SAS)

AF:

0.000622

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

67978

Other (OTH)

AF:

0.00142

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.523

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

2009

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.91

CADD

Benign

0.52

(source)

DANN

Benign

0.39

PhyloP100

-0.21

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

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