3-47848237-C-T

Variant names:

• chr3-47848237-C-T
• rs753242774
• NM_138615.3:c.2344C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_138615.3(DHX30):​c.2344C>T​(p.Arg782Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R782P) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DHX30 NM_138615.3 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 1.39
• Publications: 9 publications found

Genes affected

DHX30 (HGNC:16716): (DExH-box helicase 30) 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. The family member encoded by this gene is a mitochondrial nucleoid protein that associates with mitochondrial DNA. It has also been identified as a component of a transcriptional repressor complex that functions in retinal development, and it is required to optimize the function of the zinc-finger antiviral protein. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Feb 2013]

DHX30 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with severe motor impairment and absent language

  Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 3 uncertain in NM_138615.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-47848238-G-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2444127.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.984
• PP5: Variant 3-47848237-C-T is Pathogenic according to our data. Variant chr3-47848237-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 375373.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_138615.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DHX30	NM_138615.3	MANE Select	c.2344C>T	p.Arg782Trp	missense	Exon 15 of 22	NP_619520.1
	DHX30	NM_001330990.2		c.2260C>T	p.Arg754Trp	missense	Exon 16 of 23	NP_001317919.1
	DHX30	NM_014966.4		c.2227C>T	p.Arg743Trp	missense	Exon 16 of 23	NP_055781.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DHX30	ENST00000445061.6	TSL:1 MANE Select	c.2344C>T	p.Arg782Trp	missense	Exon 15 of 22	ENSP00000405620.1
	DHX30	ENST00000395745.6	TSL:1	n.*2244C>T		non_coding_transcript_exon	Exon 16 of 23	ENSP00000379094.2
	DHX30	ENST00000395745.6	TSL:1	n.*2244C>T		3_prime_UTR	Exon 16 of 23	ENSP00000379094.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neurodevelopmental disorder with severe motor impairment and absent language Pathogenic:5

Feb 27, 2023

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Jun 11, 2020

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.1.1, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss-of-function is a known mechanism of disease for this gene. (N) 0107 - This gene is known to be associated with autosomal dominant disease. (N) 0200 - Variant is predicted to result in a missense amino acid change from arginine to tryptophan (exon 15). (N) 0251 - Variant is heterozygous. (N) 0301 - Variant is absent from gnomAD. (P) 0501 - Missense variant consistently predicted to be damaging by multiple in silico tools or highly conserved with a major amino acid change. (P) 0602 - Variant is located in a hotspot region or cluster of pathogenic variants, (helicase nucleic acid-binding motif VI; PMID: 29100085).(P) 0801 - Strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported as pathogenic and de novo in multiple patients with a neurodevelopmental disorder (ClinVar, PMID: 28327206, PMID: 29100085). (P) 1002 - Moderate functional evidence supporting abnormal protein function. Transfected HEK293 cells demonstrate that this mutation results in significantly reduced ATPase activity and protein translation (PMID: 29100085). (P) 1203 - Variant shown to be de novo in proband (parental status confirmed). (P) Legend: (P) - Pathogenic, (N) - Neutral, (B) - Benign

Dec 31, 2017

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Oct 02, 2021

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Same nucleotide change resulting in same amino acid change has been previously reported as de novoo and observed in at least four similarly affected unrelated individuals (3billion dataset, ClinVar ID: VCV000375373.4, PMID: 29100085 and 28327206, PS2 and PS4). It is not observed in the gnomAD v2.1.1 dataset (PM2). The variant was observed as assumed (i.e. paternity and maternity not confirmed) de novoo (3billion dataset, PM6). Missense changes are a common disease-causing mechanism (PP2). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: :0.959, 3Cnet: 0.889, PP3). Therefore, this variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline.

May 28, 2019

Mendelics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

not provided Pathogenic:1

Jan 23, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies demonstrate R782W impaired ATPase activity as well as increased the propensity of stress granule formation which lead to a global decrease in protein synthesis (Lessel et al., 2017); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 28327206, 29100085, 31216405, 34020708)

Hirsutism;C0151611:EEG abnormality;C0349588:Short stature;C0557874:Global developmental delay;C1858120:Generalized hypotonia;C2315100:Failure to thrive;C3714756:Intellectual disability;C4551563:Microcephaly Pathogenic:1

Lupski Lab, Baylor-Hopkins CMG, Baylor College of Medicine

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

This variant was identified as de novo in 2 unrelated individuals with intellectual disability, microcephaly, and short stature.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.52
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.89	D
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.76	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.1	H
PhyloP100		1.4
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-7.3	D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.87
MutPred		0.87		Loss of methylation at R782 (P = 0.0104)
MVP		0.97
MPC		2.1
ClinPred		1.0	D
GERP RS		2.7
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.7
Varity_R		0.83
gMVP		1.0
Mutation Taster		=1/99	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs753242774; hg19: chr3-47889727; COSMIC: COSV53136286; COSMIC: COSV53136286;