Genetic Variant RASA2:c.-15G>T (chr3-141487069-G-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

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

The NM_006506.5(RASA2):c.-15G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00008 in 1,261,914 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00028 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000053 ( 0 hom. )

Consequence

RASA2
NM_006506.5 5_prime_UTR_premature_start_codon_gain

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.773

Variant links:

Genes affected

RASA2 (HGNC:9872): (RAS p21 protein activator 2) The protein encoded by this gene is member of the GAP1 family of GTPase-activating proteins. The gene product stimulates the GTPase activity of normal RAS p21 but not its oncogenic counterpart. Acting as a suppressor of RAS function, the protein enhances the weak intrinsic GTPase activity of RAS proteins resulting in the inactive GDP-bound form of RAS, thereby allowing control of cellular proliferation and differentiation. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

RASA2 links:

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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 (BayesDel_noAF=-0.48).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RASA2	NM_006506.5 link	c.-15G>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 24	ENST00000286364.9	NP_006497.2	Q15283-2
RASA2	NM_006506.5 link	c.-15G>T		5_prime_UTR_variant	Exon 1 of 24	ENST00000286364.9	NP_006497.2	Q15283-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RASA2	ENST00000286364 link	c.-15G>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 24	1	NM_006506.5	ENSP00000286364.3		Q15283-2
RASA2	ENST00000286364 link	c.-15G>T		5_prime_UTR_variant	Exon 1 of 24	1	NM_006506.5	ENSP00000286364.3		Q15283-2

Frequencies

GnomAD3 genomes

AF:

0.000280

AC:

AN:

150044

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000946

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000664

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000194

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000484

GnomAD4 exome

AF:

0.0000531

AC:

AN:

1111870

Hom.:

Cov.:

AF XY:

0.0000408

AC XY:

AN XY:

538736

show subpopulations

Gnomad4 AFR exome

AF:

0.00205

Gnomad4 AMR exome

AF:

0.00

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:

0.0000140

Gnomad4 OTH exome

AF:

0.0000472

GnomAD4 genome

AF:

0.000280

AC:

AN:

150044

Hom.:

Cov.:

AF XY:

0.000191

AC XY:

AN XY:

73230

show subpopulations

Gnomad4 AFR

AF:

0.000946

Gnomad4 AMR

AF:

0.0000664

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000194

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000484

Alfa

AF:

0.0000540

Hom.:

Bravo

AF:

0.000438

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 06, 2020

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: RASA2 c.-15G>T is located in the untranslated mRNA region upstream of the initiation codon. 5/5 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00018 in 43946 control chromosomes (gnomAD, genomes dataset). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.-15G>T in individuals affected with Noonan Syndrome and Related Conditions and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.48

CADD

Benign

DANN

Benign

0.90

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