rs777256889

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_004260.4(RECQL4):c.1472G>A(p.Arg491Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000012 in 1,412,788 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R491W) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

RECQL4
NM_004260.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.74

Publications

1 publications found

Variant links:

COSMIC-nc: COSV106056826

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 Gene-Disease associations (from GenCC):

Baller-Gerold syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, G2P, Orphanet
Rothmund-Thomson syndrome
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
Rothmund-Thomson syndrome type 2
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp, G2P
osteosarcoma
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
rapadilino syndrome
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp

RECQL4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.33124954).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RECQL4	NM_004260.4 link	c.1472G>A	p.Arg491Gln	missense_variant	Exon 8 of 21	ENST00000617875.6	NP_004251.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
RECQL4	ENST00000617875.6 link	c.1472G>A	p.Arg491Gln	missense_variant	Exon 8 of 21	1	NM_004260.4	ENSP00000482313.2
RECQL4	ENST00000621189.4 link	c.401G>A	p.Arg134Gln	missense_variant	Exon 7 of 20	1		ENSP00000483145.1
RECQL4	ENST00000532846.2 link	c.356G>A	p.Arg119Gln	missense_variant	Exon 4 of 9	5		ENSP00000476551.1
RECQL4	ENST00000688394.1 link	n.495G>A		non_coding_transcript_exon_variant	Exon 2 of 4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000173

AC:

AN:

173252

AF XY:

0.0000323

show subpopulations

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000278

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000120

AC:

AN:

1412788

Hom.:

Cov.:

AF XY:

0.0000143

AC XY:

AN XY:

698330

show subpopulations

African (AFR)

AF:

0.0000311

AC:

AN:

32128

American (AMR)

AF:

0.00

AC:

AN:

37110

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25364

East Asian (EAS)

AF:

0.00

AC:

AN:

36594

South Asian (SAS)

AF:

0.0000124

AC:

AN:

80562

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48776

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5716

European-Non Finnish (NFE)

AF:

0.0000138

AC:

AN:

1087860

Other (OTH)

AF:

0.00

AC:

AN:

58678

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000678

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.00000848

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Nov 22, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.R491Q variant (also known as c.1472G>A), located in coding exon 8 of the RECQL4 gene, results from a G to A substitution at nucleotide position 1472. The arginine at codon 491 is replaced by glutamine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Rothmund-Thomson syndrome;C0265308:Baller-Gerold syndrome;C1849453:Rapadilino syndrome

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Baller-Gerold syndrome

Uncertain:1

Apr 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 491 of the RECQL4 protein (p.Arg491Gln). This variant is present in population databases (rs777256889, gnomAD 0.004%). 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: 406983). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.066

BayesDel_noAF

Benign

-0.21

CADD

Benign

(source)

DANN

Benign

0.86

DEOGEN2

Benign

0.090

T;T

FATHMM_MKL

Uncertain

0.86

LIST_S2

Uncertain

0.88

D;D

M_CAP

Benign

0.037

MetaRNN

Benign

0.33

T;T

PhyloP100

2.7

PrimateAI

Benign

0.36

Sift4G

Uncertain

0.053

T;D

Polyphen

0.99

.;D

Vest4

0.40

MVP

0.74

GERP RS

3.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.27

gMVP

0.61

Mutation Taster

=75/25

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over