chr9-132670065-G-A

Position:

• chr9-132670065-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000480876.3(DDX31):​c.-131C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000709 in 1,410,226 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: DDX31 ENST00000480876.3 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.32

Genes affected

DDX31 (HGNC:16715): (DEAD-box helicase 31) 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 DEAD box protein family are believed to be involved in embryogenesis, spermatogenesis, and cellular growth and division. This gene encodes a member of this family. The function of this member has not been determined. Alternative splicing of this gene generates multiple transcript variants encoding different isoforms. [provided by RefSeq, Apr 2016]

GTF3C4 (HGNC:4667): (general transcription factor IIIC subunit 4) Predicted to enable enzyme activator activity. Predicted to contribute to DNA binding activity. Predicted to be involved in 5S class rRNA transcription by RNA polymerase III and tRNA transcription by RNA polymerase III. Located in mitochondrion and nucleoplasm. Part of transcription factor TFIIIC complex. [provided by Alliance of Genome Resources, Apr 2022]

DDX31 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.058734745).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GTF3C4	NR_133925.1	n.31G>A		non_coding_transcript_exon_variant	1/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DDX31	ENST00000480876.3	c.-131C>T		5_prime_UTR_premature_start_codon_gain_variant	1/7	1		ENSP00000479697.2
DDX31	ENST00000480876.3	c.-131C>T		5_prime_UTR_variant	1/7	1		ENSP00000479697.2
DDX31	ENST00000310532.7	c.-131C>T		5_prime_UTR_premature_start_codon_gain_variant	1/15	2		ENSP00000310539.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.09e-7 AC: 1 AN: 1410226 Hom.: 0 Cov.: 32 AF XY: 0.00000144 AC XY: 1 AN XY: 696414

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: 9.21e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

May 30, 2024

The c.185C>T (p.P62L) alteration is located in exon 1 (coding exon 1) of the DDX31 gene. This alteration results from a C to T substitution at nucleotide position 185, causing the proline (P) at amino acid position 62 to be replaced by a leucine (L). 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	-0.23	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	6.8
DANN	Benign	0.77
DEOGEN2	Benign	0.0013	T;T;.;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.092	N
LIST_S2	Benign	0.54	.;T;T;T
M_CAP	Benign	0.0091	T
MetaRNN	Benign	0.059	T;T;T;T
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	0.0	N;N;N;N
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.34	N;N;N;.
REVEL	Benign	0.029
Sift	Uncertain	0.029	D;D;D;.
Sift4G	Uncertain	0.025	D;D;T;D
Polyphen		0.015	B;B;.;B
Vest4		0.12
MutPred		0.28		Gain of sheet (P = 0.0043);Gain of sheet (P = 0.0043);Gain of sheet (P = 0.0043);Gain of sheet (P = 0.0043);
MVP		0.25
MPC		0.15
ClinPred		0.13	T
GERP RS		-2.7
Varity_R		0.047
gMVP		0.055

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: chr9-135545452;