4-168361209-A-G

Variant summary

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

The NM_001012967.3(DDX60L):c.4931T>C(p.Met1644Thr) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000351 in 1,426,400 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/19 in silico tools predict a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: DDX60L NM_001012967.3 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.86

Genes affected

DDX60L (HGNC:26429): (DExD/H-box 60 like) This gene encodes a member of the DExD/H-box helicase family of proteins, a subset of the super family 2 helicases. Members of the DExD/H-box helicase family share a conserved functional core comprised of two RecA-like globular domains. These domains contain conserved motifs that mediate ATP binding, ATP hydrolysis, nucleic acid binding, and RNA unwinding. In addition to functions in RNA metabolism, members of this family are involved in anti-viral immunity and act as cytosolic sensors of viral nucleic acids. The protein encoded by this gene has been shown to inhibit hepatitis C virus replication in response to interferon stimulation in cell culture. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2016]

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=0.18394753).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DDX60L	NM_001012967.3	c.4931T>C	p.Met1644Thr	missense_variant, splice_region_variant	37/38	ENST00000682922.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DDX60L	ENST00000682922.1	c.4931T>C	p.Met1644Thr	missense_variant, splice_region_variant	37/38		NM_001012967.3
DDX60L	ENST00000511577.5	c.4931T>C	p.Met1644Thr	missense_variant, splice_region_variant	37/38	5		P1
DDX60L	ENST00000510590.1	n.1907T>C		splice_region_variant, non_coding_transcript_exon_variant	8/9	2
DDX60L	ENST00000513103.1	n.231T>C		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000351 AC: 5 AN: 1426400 Hom.: 0 Cov.: 24 AF XY: 0.00000281 AC XY: 2 AN XY: 711028

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: 0.00000462

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

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 12, 2023

The c.4931T>C (p.M1644T) alteration is located in exon 37 (coding exon 36) of the DDX60L gene. This alteration results from a T to C substitution at nucleotide position 4931, causing the methionine (M) at amino acid position 1644 to be replaced by a threonine (T). 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	0.30
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
Cadd	Benign	17
Dann	Benign	0.54
Eigen	Benign	-0.41
Eigen_PC	Benign	-0.55
FATHMM_MKL	Benign	0.37	N
M_CAP	Benign	0.0079	T
MetaRNN	Benign	0.18	T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-2.4	N;N
REVEL	Benign	0.15
Sift	Uncertain	0.0060	D;D
Sift4G	Uncertain	0.010	D;D
Vest4		0.34
MutPred		0.54		Loss of stability (P = 0.0265);Loss of stability (P = 0.0265);
MVP		0.17
MPC		0.032
ClinPred		0.20	T
GERP RS		2.1
gMVP		0.37

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: rs1739055286; hg19: chr4-169282360;