1-111766501-C-G

Variant names:

• chr1-111766501-C-G
• rs197414
• NM_007204.5:c.2077C>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_007204.5(DDX20):​c.2077C>G​(p.Arg693Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000112 in 1,613,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R693S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: DDX20 NM_007204.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.02

Genes affected

DDX20 (HGNC:2743): (DEAD-box helicase 20) DEAD box proteins, characterized by the conserved motif Asp-Glu-Ala-Asp (DEAD), are putative RNA helicases. They are implicated in a number of cellular processes involving alteration of RNA secondary structure such as translation initiation, nuclear and mitochondrial splicing, and ribosome and spliceosome assembly. Based on their distribution patterns, some members of this family are believed to be involved in embryogenesis, spermatogenesis, and cellular growth and division. This gene encodes a DEAD box protein, which has an ATPase activity and is a component of the survival of motor neurons (SMN) complex. This protein interacts directly with SMN, the spinal muscular atrophy gene product, and may play a catalytic role in the function of the SMN complex on RNPs. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06944972).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DDX20	NM_007204.5	c.2077C>G	p.Arg693Gly	missense_variant	Exon 11 of 11	ENST00000369702.5	NP_009135.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DDX20	ENST00000369702.5	c.2077C>G	p.Arg693Gly	missense_variant	Exon 11 of 11	1	NM_007204.5	ENSP00000358716.4

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151956 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000386

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000109 AC: 16 AN: 1461848 Hom.: 0 Cov.: 34 AF XY: 0.0000124 AC XY: 9 AN XY: 727220

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000353

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 151956 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74218

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.68
CADD	Benign	7.6
DANN	Benign	0.92
DEOGEN2	Benign	0.13	T;.
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.40	N
LIST_S2	Benign	0.40	T;T
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.069	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N;.
PrimateAI	Benign	0.19	T
PROVEAN	Benign	-1.9	N;N
REVEL	Benign	0.081
Sift	Benign	0.34	T;T
Sift4G	Benign	0.37	T;T
Polyphen		0.0030	B;B
Vest4		0.069
MutPred		0.082		Gain of catalytic residue at P689 (P = 0.0721);.;
MVP		0.66
MPC		0.10
ClinPred		0.14	T
GERP RS		4.1
Varity_R		0.099
gMVP		0.090

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

LitVar

Other links and lift over

dbSNP: rs197414; hg19: chr1-112309123;