rs550469990

Positions:

chr8-144513255-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBP6

The NM_004260.4(RECQL4):c.2426G>A(p.Gly809Glu) variant causes a missense change. The variant allele was found at a frequency of 0.000187 in 1,590,480 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00040 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00016 ( 0 hom. )

Consequence

RECQL4
NM_004260.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:3

Conservation

PhyloP100: 4.47

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:

RECQL4 (HGNC:):

RECQL4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.036753565).

BP6

Variant 8-144513255-C-T is Benign according to our data. Variant chr8-144513255-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 407006.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=4, Benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RECQL4	NM_004260.4 linkuse as main transcript	c.2426G>A	p.Gly809Glu	missense_variant	14/21	ENST00000617875.6	NP_004251.4	O94761

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
RECQL4	ENST00000617875.6 linkuse as main transcript	c.2426G>A	p.Gly809Glu	missense_variant	14/21	1	NM_004260.4	ENSP00000482313.2	O94761
RECQL4	ENST00000621189.4 linkuse as main transcript	c.1355G>A	p.Gly452Glu	missense_variant	13/20	1		ENSP00000483145.1	A0A087X072
RECQL4	ENST00000534626.6 linkuse as main transcript	c.634-117G>A		intron_variant		5		ENSP00000477457.1	V9GZ64
ENSG00000265393	ENST00000580385.1 linkuse as main transcript	n.272-351C>T		intron_variant		3

Frequencies

GnomAD3 genomes

AF:

0.000401

AC:

AN:

152124

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00222

Gnomad ASJ

AF:

0.00231

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000206

Gnomad OTH

AF:

0.00192

GnomAD3 exomes

AF:

0.000327

AC:

AN:

217010

Hom.:

AF XY:

0.000397

AC XY:

AN XY:

121052

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000269

Gnomad ASJ exome

AF:

0.00342

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000101

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000245

Gnomad OTH exome

AF:

0.000546

GnomAD4 exome

AF:

0.000164

AC:

236

AN:

1438238

Hom.:

Cov.:

AF XY:

0.000169

AC XY:

121

AN XY:

714510

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000544

Gnomad4 ASJ exome

AF:

0.00262

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000701

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000940

Gnomad4 OTH exome

AF:

0.000569

GnomAD4 genome

AF:

0.000401

AC:

AN:

152242

Hom.:

Cov.:

AF XY:

0.000349

AC XY:

AN XY:

74434

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00222

Gnomad4 ASJ

AF:

0.00231

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000206

Gnomad4 OTH

AF:

0.00190

Alfa

AF:

0.000640

Hom.:

Bravo

AF:

0.000737

ExAC

AF:

0.000271

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Rothmund-Thomson syndrome type 2

Uncertain:1Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	St. Jude Molecular Pathology, St. Jude Children's Research Hospital	Mar 04, 2021	The RECQL4 c.2426G>A (p.Gly809Glu) missense change is present in gnomAD at a maximum non-founder subpopulation frequency of 0.026% in gnomAD v2.1.1 (https://gnomad.broadinstitute.org/variant/8-145738638-C-T?dataset=gnomad_r2_1). In silico tools predict a deleterious effect of this variant on protein function (PP3), but to our knowledge these predictions have not been confirmed by functional assays. To our knowledge, this variant has not been reported in individuals with RECQL4-associated disorders. In summary, this variant meets criteria to be classified as of uncertain significance based on the ACMG/AMP criteria: PP3. -
Likely benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -

not specified

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Genetic Services Laboratory, University of Chicago

Jul 23, 2022

DNA sequence analysis of the RECQL4 gene demonstrated a sequence change, c.2426G>A, in exon 14 that results in an amino acid change, p.Gly809Glu. This sequence change does not appear to have been previously described in individuals with RECQL4-related disorders. This sequence change has been described in the gnomAD database with a frequency of 0.34% in the Ashkenazi Jewish subpopulation (dbSNP rs550469990). The p.Gly809Glu change affects a highly conserved amino acid residue located in a domain of the RECQL4 protein that is known to be functional. In-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL) provide contradictory results for the p.Gly809Glu substitution. Due to insufficient evidences and the lack of functional studies, the clinical significance of the p.Gly809Glu change remains unknown at this time. Homozygous or compound heterozygous pathogenic variants in RECQL4 have been identified in individuals with Baller-Gerold syndrome [OMIM #218600], which is characterized by craniosynostosis and radial aplasia. Biallelic pathogenic variants in RECQL4 are also associated with two additional overlapping conditions, Rothmund-Thompson syndrome [OMIM #268400] and RAPADILINO syndrome [OMIM #266280]. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 02, 2024

The p.G809E variant (also known as c.2426G>A), located in coding exon 14 of the RECQL4 gene, results from a G to A substitution at nucleotide position 2426. The glycine at codon 809 is replaced by glutamic acid, an amino acid with similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Sep 07, 2023

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

curation

Sema4, Sema4

Oct 15, 2021

- -

RECQL4-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jul 27, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Baller-Gerold syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 20, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.34

BayesDel_addAF

Benign

-0.0049

BayesDel_noAF

Uncertain

0.050

CADD

Uncertain

DANN

Benign

0.91

DEOGEN2

Benign

0.27

T;D

FATHMM_MKL

Uncertain

0.94

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Uncertain

0.20

MetaRNN

Benign

0.037

T;T

MutationAssessor

Pathogenic

3.7

.;H

PrimateAI

Uncertain

0.70

Sift4G

Uncertain

0.0040

D;D

Polyphen

1.0

.;D

Vest4

0.39

MVP

0.78

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

Varity_R

0.38

gMVP

0.73

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