8-144515862-C-A

Position:

chr8-144515862-C-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_004260.4(RECQL4):c.1160G>T(p.Gly387Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000639 in 1,612,984 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 10/13 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00045 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

RECQL4
NM_004260.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: -0.403

Variant links:

Genes affected

RECQL4 (HGNC:9949): (RecQ like helicase 4) The protein encoded by this gene is a DNA helicase that belongs to the RecQ helicase family. DNA helicases unwind double-stranded DNA into single-stranded DNAs and may modulate chromosome segregation. This gene is predominantly expressed in thymus and testis. Mutations in this gene are associated with Rothmund-Thomson, RAPADILINO and Baller-Gerold syndromes. [provided by RefSeq, Jan 2010]

RECQL4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.014786035).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RECQL4	NM_004260.4 linkuse as main transcript	c.1160G>T	p.Gly387Val	missense_variant	6/21	ENST00000617875.6	NP_004251.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
RECQL4	ENST00000617875.6 linkuse as main transcript	c.1160G>T	p.Gly387Val	missense_variant	6/21	1	NM_004260.4	ENSP00000482313	P1
RECQL4	ENST00000621189.4 linkuse as main transcript	c.89G>T	p.Gly30Val	missense_variant	5/20	1		ENSP00000483145
RECQL4	ENST00000532846.2 linkuse as main transcript	c.47G>T	p.Gly16Val	missense_variant	2/9	5		ENSP00000476551
RECQL4	ENST00000524998.1 linkuse as main transcript	c.683G>T	p.Gly228Val	missense_variant	4/4	3		ENSP00000476579

Frequencies

GnomAD3 genomes

AF:

0.000447

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000809

AC:

AN:

247096

Hom.:

AF XY:

0.0000891

AC XY:

AN XY:

134608

show subpopulations

Gnomad AFR exome

AF:

0.000984

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000897

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000240

AC:

AN:

1460630

Hom.:

Cov.:

AF XY:

0.0000179

AC XY:

AN XY:

726570

show subpopulations

Gnomad4 AFR exome

AF:

0.000717

Gnomad4 AMR exome

AF:

0.0000895

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:

0.00000270

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.000446

AC:

AN:

152354

Hom.:

Cov.:

AF XY:

0.000483

AC XY:

AN XY:

74494

show subpopulations

Gnomad4 AFR

AF:

0.00144

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000526

Hom.:

Bravo

AF:

0.000476

ESP6500AA

AF:

0.000501

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000124

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 03, 2023	Has not been previously published as pathogenic or benign in association with a RECQL4-related disorder to our knowledge, but was identified in an individual with a chondrosarcoma (Ballinger et al., 2016); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 27498913) -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jul 27, 2021

DNA sequence analysis of the RECQL4 gene demonstrated a sequence change, c.1160G>T, in exon 6 results in an amino acid change, p.Gly387Val. This sequence change does not appear to have been previously described in individuals with RECQL4-related disorders and has also been described in the gnomAD database with a population frequency of 0.14% in the African subpopulation (dbSNP rs369815468). The p.Gly387Val change affects a highly conserved amino acid residue located in a domain of the RECQL4 protein that is not known to be functional. The p.Gly387Val substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD). Due to these contrasting evidences and the lack of functional studies, the clinical significance of the p.Gly387Val change remains unknown at this time. -

Baller-Gerold syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 02, 2023

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 387 of the RECQL4 protein (p.Gly387Val). This variant is present in population databases (rs369815468, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with RECQL4-related conditions. ClinVar contains an entry for this variant (Variation ID: 406906). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt RECQL4 protein function with a negative predictive value of 80%. 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. -

RECQL4-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 20, 2024

The RECQL4 c.1160G>T variant is predicted to result in the amino acid substitution p.Gly387Val. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.14% of alleles in individuals of African descent in gnomAD (http://gnomad.broadinstitute.org/variant/8-145741246-C-A) and is interpreted as uncertain in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/406906/). Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.33

CADD

Benign

8.5

DANN

Benign

0.78

DEOGEN2

Benign

0.098

T;T

FATHMM_MKL

Benign

0.14

LIST_S2

Benign

0.71

T;T

M_CAP

Benign

0.022

MetaRNN

Benign

0.015

T;T

PrimateAI

Benign

0.23

Sift4G

Uncertain

0.0050

D;D

Polyphen

0.90

.;P

Vest4

0.25

MVP

0.74

GERP RS

-2.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.027

gMVP

0.33

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over