16-56336824-C-T

Variant names:

• chr16-56336824-C-T
• rs546569747
• NM_020988.3:c.687C>T

Variant summary

Our verdict is Benign. The variant received -15 ACMG points: 0P and 15B. BP4_Moderate BP6_Very_Strong BP7 BS2

The NM_020988.3(GNAO1):​c.687C>T​(p.Ser229Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000144 in 1,613,196 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.000092 (0 hom., cov: 34)
  • Exomes 𝑓: 0.00015 (2 hom.)
• Consequence: GNAO1 NM_020988.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: 0.550
• Publications: 1 publications found

Genes affected

GNAO1 (HGNC:4389): (G protein subunit alpha o1) The protein encoded by this gene represents the alpha subunit of the Go heterotrimeric G-protein signal-transducing complex. Defects in this gene are a cause of early-onset epileptic encephalopathy. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2015]

GNAO1 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 17

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• movement disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
• neurodevelopmental disorder with involuntary movements

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Benign. The variant received -15 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.34).
• BP6: Variant 16-56336824-C-T is Benign according to our data. Variant chr16-56336824-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 415876.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.55 with no splicing effect.
• BS2: High AC in GnomAd4 at 14 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020988.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAO1	NM_020988.3	MANE Select	c.687C>T	p.Ser229Ser	synonymous	Exon 6 of 9	NP_066268.1
	GNAO1	NM_138736.3		c.687C>T	p.Ser229Ser	synonymous	Exon 6 of 8	NP_620073.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAO1	ENST00000262493.12	TSL:1 MANE Select	c.687C>T	p.Ser229Ser	synonymous	Exon 6 of 9	ENSP00000262493.6
	GNAO1	ENST00000262494.13	TSL:1	c.687C>T	p.Ser229Ser	synonymous	Exon 6 of 8	ENSP00000262494.7
	GNAO1	ENST00000638705.1	TSL:1	c.687C>T	p.Ser229Ser	synonymous	Exon 6 of 8	ENSP00000491223.1

Frequencies

GnomAD3 genomes AF: 0.0000920 AC: 14 AN: 152254 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.0000482

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000771

Gnomad SAS AF: 0.000621

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000284 AC: 71 AN: 249724 AF XY: 0.000377

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000436

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000885

Gnomad OTH exome AF: 0.000655

GnomAD4 exome AF: 0.000150 AC: 219 AN: 1460824 Hom.: 2 Cov.: 31 AF XY: 0.000202 AC XY: 147 AN XY: 726736

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44694

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.000227 AC: 9 AN: 39684

South Asian (SAS) AF: 0.00181 AC: 156 AN: 86202

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000117 AC: 13 AN: 1111872

Other (OTH) AF: 0.000679 AC: 41 AN: 60372

GnomAD4 genome AF: 0.0000919 AC: 14 AN: 152372 Hom.: 0 Cov.: 34 AF XY: 0.000107 AC XY: 8 AN XY: 74518

African (AFR) AF: 0.0000481 AC: 2 AN: 41596

American (AMR) AF: 0.00 AC: 0 AN: 15312

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.000772 AC: 4 AN: 5178

South Asian (SAS) AF: 0.000621 AC: 3 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000588 AC: 4 AN: 68036

Other (OTH) AF: 0.000473 AC: 1 AN: 2114

Alfa AF: 0.000130 Hom.: 0

Bravo AF: 0.0000907

Asia WGS AF: 0.00173 AC: 6 AN: 3478

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

ClinVar submissions as Germline

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Developmental and epileptic encephalopathy (1)
-	-	1	GNAO1-related disorder (1)
-	-	1	Inborn genetic diseases (1)
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.34
CADD	Benign	17
DANN	Benign	0.84
PhyloP100		0.55
PromoterAI		-0.074	Neutral
Mutation Taster		=98/2	polymorphism

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: rs546569747; hg19: chr16-56370736;