chr16-72112468-C-G

Position:

• chr16-72112468-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_014003.4(DHX38):​c.3655C>G​(p.Arg1219Gly) variant causes a missense change. The variant allele was found at a frequency of 0.0000048 in 1,459,832 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1219C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: DHX38 NM_014003.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.54

Genes affected

DHX38 (HGNC:17211): (DEAH-box helicase 38) 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. The protein encoded by this gene is a member of the DEAD/H box family of splicing factors. This protein resembles yeast Prp16 more closely than other DEAD/H family members. It is an ATPase and essential for the catalytic step II in pre-mRNA splicing process. [provided by RefSeq, Jul 2008]

PMFBP1 (HGNC:17728): (polyamine modulated factor 1 binding protein 1) Involved in spermatogenesis. Located in sperm connecting piece. Implicated in spermatogenic failure 31. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37389994).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DHX38	NM_014003.4	c.3655C>G	p.Arg1219Gly	missense_variant	27/27	ENST00000268482.8
DHX38	XM_011523484.3	c.3655C>G	p.Arg1219Gly	missense_variant	27/28
DHX38	XM_047434985.1	c.3655C>G	p.Arg1219Gly	missense_variant	27/28
DHX38	XM_017023913.3	c.3550C>G	p.Arg1184Gly	missense_variant	26/27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DHX38	ENST00000268482.8	c.3655C>G	p.Arg1219Gly	missense_variant	27/27	1	NM_014003.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000802 AC: 2 AN: 249304 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134966

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000480 AC: 7 AN: 1459832 Hom.: 0 Cov.: 31 AF XY: 0.00000551 AC XY: 4 AN XY: 726344

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: 0.0000696

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 20, 2022

This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 1219 of the DHX38 protein (p.Arg1219Gly). This variant is present in population databases (rs772203418, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with DHX38-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.46
BayesDel_addAF	Benign	-0.039	T
BayesDel_noAF	Benign	-0.11
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.29	T;T
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Pathogenic	0.97	D;D
M_CAP	Benign	0.0082	T
MetaRNN	Benign	0.37	T;T
MetaSVM	Benign	-1.2	T
MutationAssessor	Uncertain	2.0	M;.
MutationTaster	Benign	0.99	D;D;D
PrimateAI	Uncertain	0.67	T
PROVEAN	Uncertain	-3.6	D;.
REVEL	Benign	0.16
Sift	Benign	0.033	D;.
Sift4G	Uncertain	0.012	D;D
Polyphen		0.93	P;.
Vest4		0.51
MutPred		0.22		Loss of MoRF binding (P = 0.0304);.;
MVP		0.61
MPC		1.6
ClinPred		0.92	D
GERP RS		5.3
Varity_R		0.36
gMVP		0.54

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: rs772203418; hg19: chr16-72146367;