Genetic Variant NF1:p.Thr123Thr (chr17-31163266-C-G) – ACMG Classification: Benign (-21 pts)

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_001042492.3(NF1):c.369C>G(p.Thr123Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000369 in 1,614,134 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. T123T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00036 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00037 ( 7 hom. )

Consequence

NF1
NM_001042492.3 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:15

Conservation

PhyloP100: -0.148

Publications

10 publications found

Variant links:

Genes affected

NF1 (HGNC:7765): (neurofibromin 1) This gene product appears to function as a negative regulator of the ras signal transduction pathway. Mutations in this gene have been linked to neurofibromatosis type 1, juvenile myelomonocytic leukemia and Watson syndrome. The mRNA for this gene is subject to RNA editing (CGA>UGA->Arg1306Term) resulting in premature translation termination. Alternatively spliced transcript variants encoding different isoforms have also been described for this gene. [provided by RefSeq, Jul 2008]

NF1 Gene-Disease associations (from GenCC):

neurofibromatosis type 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp
neurofibromatosis-Noonan syndrome
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
Moyamoya disease
Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
hereditary pheochromocytoma-paraganglioma
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial ovarian cancer
Inheritance: Unknown Classification: NO_KNOWN Submitted by: ClinGen

NF1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.006127566).

BP6

Variant 17-31163266-C-G is Benign according to our data. Variant chr17-31163266-C-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 184262.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-0.148 with no splicing effect.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.000361 (55/152280) while in subpopulation EAS AF = 0.00964 (50/5188). AF 95% confidence interval is 0.00751. There are 1 homozygotes in GnomAd4. There are 32 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 55 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001042492.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
NF1	NM_001042492.3	MANE Select	c.369C>G	p.Thr123Thr	synonymous	Exon 4 of 58	NP_001035957.1	P21359-1
NF1	NM_000267.4		c.369C>G	p.Thr123Thr	synonymous	Exon 4 of 57	NP_000258.1
NF1	NM_001128147.3		c.369C>G	p.Thr123Thr	synonymous	Exon 4 of 15	NP_001121619.1	P21359-5

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
NF1	ENST00000358273.9	TSL:1 MANE Select	c.369C>G	p.Thr123Thr	synonymous	Exon 4 of 58	ENSP00000351015.4	P21359-1
NF1	ENST00000356175.7	TSL:1	c.369C>G	p.Thr123Thr	synonymous	Exon 4 of 57	ENSP00000348498.3	P21359-2
NF1	ENST00000431387.8	TSL:1	c.369C>G	p.Thr123Thr	synonymous	Exon 4 of 15	ENSP00000412921.4	P21359-5

Frequencies

GnomAD3 genomes

AF:

0.000361

AC:

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00962

Gnomad SAS

AF:

0.000828

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000852

AC:

214

AN:

251314

AF XY:

0.000817

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0111

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000816

GnomAD4 exome

AF:

0.000369

AC:

540

AN:

1461854

Hom.:

Cov.:

AF XY:

0.000356

AC XY:

259

AN XY:

727236

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0125

AC:

498

AN:

39694

South Asian (SAS)

AF:

0.000162

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111992

Other (OTH)

AF:

0.000431

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

Heterozygous variant carriers

102

136

170

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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:

0.000361

AC:

AN:

152280

Hom.:

Cov.:

AF XY:

0.000430

AC XY:

AN XY:

74456

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41550

American (AMR)

AF:

0.0000654

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00964

AC:

AN:

5188

South Asian (SAS)

AF:

0.000829

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10610

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68024

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.0000427

Hom.:

Bravo

AF:

0.000502

ExAC

AF:

0.000881

AC:

107

Asia WGS

AF:

0.00289

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Neurofibromatosis, type 1 (4)

not provided (3)

Hereditary cancer-predisposing syndrome (2)

Neurofibromatosis, type 1;C0349639:Juvenile myelomonocytic leukemia;C0553586:Café-au-lait macules with pulmonary stenosis;C1834235:Neurofibromatosis, familial spinal;C2931482:Neurofibromatosis-Noonan syndrome (2)

Café-au-lait macules with pulmonary stenosis (1)

Neurofibromatosis-Noonan syndrome (1)

Neurofibromatosis, familial spinal (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.30

BayesDel_noAF

Benign

-0.52

CADD

Benign

8.0

(source)

DANN

Benign

0.62

FATHMM_MKL

Benign

0.52

LIST_S2

Benign

0.41

MetaRNN

Benign

0.0061

PhyloP100

-0.15

GERP RS

-1.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=98/2

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over