rs373957300

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PP3_ModeratePP5

The NM_001519.4(BRF1):c.776C>T(p.Thr259Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,613,762 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 14/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T259T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

BRF1
NM_001519.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4U:1

Conservation

PhyloP100: 9.51

Publications

5 publications found

Variant links:

Genes affected

BRF1 (HGNC:11551): (BRF1 RNA polymerase III transcription initiation factor subunit) This gene encodes one of the three subunits of the RNA polymerase III transcription factor complex. This complex plays a central role in transcription initiation by RNA polymerase III on genes encoding tRNA, 5S rRNA, and other small structural RNAs. The gene product belongs to the TF2B family. Several alternatively spliced variants encoding different isoforms, that function at different promoters transcribed by RNA polymerase III, have been identified. [provided by RefSeq, Jun 2011]

BRF1 Gene-Disease associations (from GenCC):

cerebellar-facial-dental syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet, PanelApp Australia, Ambry Genetics
colorectal adenoma
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

BRF1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.911

PP5

Variant 14-105228832-G-A is Pathogenic according to our data. Variant chr14-105228832-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 161424.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRF1	NM_001519.4 link	c.776C>T	p.Thr259Met	missense_variant	Exon 7 of 18	ENST00000547530.7	NP_001510.2	Q92994-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRF1	ENST00000547530.7 link	c.776C>T	p.Thr259Met	missense_variant	Exon 7 of 18	1	NM_001519.4	ENSP00000448387.2		Q92994-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000159

AC:

AN:

251300

AF XY:

0.00000736

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:

0.000139

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000889

AC:

AN:

1461544

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727050

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.0000447

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000941

AC:

AN:

53140

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111960

Other (OTH)

AF:

0.0000166

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

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

AF:

0.0000263

AC:

AN:

152218

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74366

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41464

American (AMR)

AF:

0.000131

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68040

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.412

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.0000540

Hom.:

Bravo

AF:

0.0000189

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:4Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Cerebellar-facial-dental syndrome

Pathogenic:3

Dec 04, 2014

Institute of Human Genetics, University of Ulm

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:research

- -

Jan 05, 2015

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

May 10, 2021

Tgen's Center for Rare Childhood Disorders, Translational Genomics Research Institute (tgen)

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:research

The p.Thr259Met variant was found in a research study in a compound heterozygous state with the variant c.793_794delACinsCATTTA, p.Thr265HisfsX5 (T265HfsX5). The six year old female displayed failure to thrive, microcephaly, dysmorphic facial features, short stature, global developmental delays, anemia, osteopenia, hypotonia, seizures, cerebellar ataxia, sensorineural hearing loss and a bicuspid aortic valve. Bilateral progressive fetal nuclear cataracts with a cortical radial â€œriderâ€ and numerous vacuoles were also seen. The p.Thr259Met variant was previously described in affected siblings in a compound heterozygous state by Borck et al. (2015). -

Inborn genetic diseases

Pathogenic:1

Apr 26, 2021

Ambry Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.776C>T (p.T259M) alteration is located in coding exon 7 of the BRF1 gene. This alteration results from a C to T substitution at nucleotide position 776, causing the threonine (T) at amino acid position 259 to be replaced by a methionine (M). Based on data from the Genome Aggregation Database (gnomAD) database, the BRF1 c.776C>T alteration was observed in 0.0021% (6/282678) of total alleles studied, with a frequency of 0.012% (3/25070) in the European (Finnish) subpopulation. This alteration was observed to occur in trans with another missense variant in two individuals from one family who presented with clinical features of cerebrofaciodental syndrome including microcephaly, short stature, mild intellectual disability, facial dysmorphism, dental anomalies, scoliosis, delayed bone age, cardiac anomalies, and brain anomalies (Borck, 2015). The p.T259 amino acid is conserved in available vertebrate species. Yeast cells with the p.T259M alteration were observed to decrease promoter binding of Pol III at several tRNA sites and decrease transcription output as compared to yeast with wildtype protein (Borck, 2015). The p.T259M alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, this alteration is classified as likely pathogenic. -

not provided

Uncertain:1

Oct 06, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. Experimental studies in zebrafish, yeast and in vitro have shown that this missense change partially disrupts BRF1 protein function (PMID: 25561519). This variant has been reported to segregate with short stature, microcephaly, intellectual disability and characteristic facial dysmorphology in a single family (PMID: 25561519). ClinVar contains an entry for this variant (Variation ID: 161424). This variant is present in population databases (rs373957300, ExAC 0.003%). This sequence change replaces threonine with methionine at codon 259 of the BRF1 protein (p.Thr259Met). The threonine residue is highly conserved and there is a moderate physicochemical difference between threonine and methionine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.49

BayesDel_noAF

Pathogenic

0.49

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.88

.;D;.;.;D;.;D;.;.;D;D

Eigen

Pathogenic

0.95

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

1.0

D;D;D;D;D;D;D;D;D;D;D

M_CAP

Pathogenic

0.62

MetaRNN

Pathogenic

0.91

D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.59

MutationAssessor

Pathogenic

3.8

.;H;.;.;.;.;.;.;.;.;.

PhyloP100

9.5

PrimateAI

Pathogenic

0.82

PROVEAN

Pathogenic

-5.3

D;.;D;D;D;D;.;D;D;D;D

REVEL

Pathogenic

0.83

Sift

Uncertain

0.0010

D;.;D;D;D;D;.;D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D;D;D;D;.;.

Polyphen

1.0

.;D;D;.;.;.;.;.;.;.;.

Vest4

0.97

MVP

0.68

ClinPred

0.99

GERP RS

5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.84

gMVP

0.84

Mutation Taster

=1/99

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over