chr17-63787140-C-T

Position:

• chr17-63787140-C-T

Variant summary

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

The NM_203499.3(DDX42):​c.91C>T​(p.Leu31Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DDX42 NM_203499.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.09

Genes affected

DDX42 (HGNC:18676): (DEAD-box helicase 42) This gene encodes a member of the Asp-Glu-Ala-Asp (DEAD) box protein family. Members of this protein family are putative RNA helicases, and 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. Members of this family are believed to be involved in embryogenesis, spermatogenesis, and cellular growth and division. Two transcript variants encoding the same protein have been identified for this gene. [provided by RefSeq, Jul 2008]

DDX42 (HGNC:):

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=0.1880058).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DDX42	NM_203499.3	c.91C>T	p.Leu31Phe	missense_variant	2/18	ENST00000389924.7	NP_987095.1
DDX42	NM_007372.3	c.91C>T	p.Leu31Phe	missense_variant	3/19		NP_031398.2
DDX42	XM_047435281.1	c.91C>T	p.Leu31Phe	missense_variant	4/20		XP_047291237.1
DDX42	XM_047435282.1	c.91C>T	p.Leu31Phe	missense_variant	5/21		XP_047291238.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DDX42	ENST00000389924.7	c.91C>T	p.Leu31Phe	missense_variant	2/18	5	NM_203499.3	ENSP00000374574.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461890 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

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 Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 24, 2022

The c.91C>T (p.L31F) alteration is located in exon 3 (coding exon 1) of the DDX42 gene. This alteration results from a C to T substitution at nucleotide position 91, causing the leucine (L) at amino acid position 31 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	0.0040	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.046	.;T;T;T
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.88	D;.;.;D
M_CAP	Benign	0.0088	T
MetaRNN	Benign	0.19	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.9	.;L;L;L
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-1.2	.;.;.;N
REVEL	Benign	0.13
Sift	Uncertain	0.0030	.;.;.;D
Sift4G	Benign	0.15	T;T;T;T
Polyphen		0.92	.;P;P;P
Vest4		0.41, 0.41, 0.41
MVP		0.53
MPC		1.5
ClinPred		0.70	D
GERP RS		5.4
Varity_R		0.11
gMVP		0.27

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-61864500;