chr1-21598474-T-C

Position:

• chr1-21598474-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002885.4(RAP1GAP):​c.1805A>G​(p.His602Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: RAP1GAP NM_002885.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.50

Genes affected

RAP1GAP (HGNC:9858): (RAP1 GTPase activating protein) This gene encodes a type of GTPase-activating-protein (GAP) that down-regulates the activity of the ras-related RAP1 protein. RAP1 acts as a molecular switch by cycling between an inactive GDP-bound form and an active GTP-bound form. The product of this gene, RAP1GAP, promotes the hydrolysis of bound GTP and hence returns RAP1 to the inactive state whereas other proteins, guanine nucleotide exchange factors (GEFs), act as RAP1 activators by facilitating the conversion of RAP1 from the GDP- to the GTP-bound form. In general, ras subfamily proteins, such as RAP1, play key roles in receptor-linked signaling pathways that control cell growth and differentiation. RAP1 plays a role in diverse processes such as cell proliferation, adhesion, differentiation, and embryogenesis. Alternative splicing results in multiple transcript variants encoding distinct proteins. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15060687).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RAP1GAP	NM_002885.4	c.1805A>G	p.His602Arg	missense_variant	22/25	ENST00000374765.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RAP1GAP	ENST00000374765.9	c.1805A>G	p.His602Arg	missense_variant	22/25	1	NM_002885.4	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 01, 2022

The c.1997A>G (p.H666R) alteration is located in exon 22 (coding exon 22) of the RAP1GAP gene. This alteration results from a A to G substitution at nucleotide position 1997, causing the histidine (H) at amino acid position 666 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.098
BayesDel_addAF	Uncertain	0.073	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	23
DANN	Benign	0.96
Eigen	Benign	-0.23
Eigen_PC	Benign	-0.14
FATHMM_MKL	Benign	0.76	D
LIST_S2	Uncertain	0.93	D;D;D;D;D
M_CAP	Benign	0.063	D
MetaRNN	Benign	0.15	T;T;T;T;T
MetaSVM	Benign	-0.37	T
MutationTaster	Benign	0.90	D;D;D;D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-1.1	N;N;N;N;.
REVEL	Benign	0.21
Sift	Pathogenic	0.0	D;T;T;T;.
Sift4G	Benign	0.34	T;T;T;T;T
Polyphen		0.40, 0.029	.;.;B;B;.
Vest4		0.48
MutPred		0.21		.;.;Loss of ubiquitination at K603 (P = 0.0353);.;.;
MVP		0.35
ClinPred		0.75	D
GERP RS		2.2
Varity_R		0.18
gMVP		0.19

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-21924967;