17-78708229-A-C

Variant names:

• chr17-78708229-A-C
• rs145550753
• NM_004762.6:c.138T>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004762.6(CYTH1):​c.138T>G​(p.Asn46Lys) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,368 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CYTH1 NM_004762.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.71
• Publications: 0 publications found

Genes affected

CYTH1 (HGNC:9501): (cytohesin 1) The protein encoded by this gene is a member of the PSCD family. Members of this family have identical structural organization that consists of an N-terminal coiled-coil motif, a central Sec7 domain, and a C-terminal pleckstrin homology (PH) domain. The coiled-coil motif is involved in homodimerization, the Sec7 domain contains guanine-nucleotide exchange protein activity, and the PH domain interacts with phospholipids and is responsible for association of PSCDs with membranes. Members of this family appear to mediate the regulation of protein sorting and membrane trafficking. This gene is highly expressed in natural killer and peripheral T cells, and regulates the adhesiveness of integrins at the plasma membrane of lymphocytes. A pseudogene of this gene has been defined on the X chromosome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2014]

ENSG00000294365 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16183507).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004762.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYTH1	NM_004762.6	MANE Select	c.138T>G	p.Asn46Lys	missense	Exon 3 of 14	NP_004753.1	Q15438-1
	CYTH1	NM_001365040.2		c.144T>G	p.Asn48Lys	missense	Exon 3 of 13	NP_001351969.1	K7ENQ8
	CYTH1	NM_017456.4		c.138T>G	p.Asn46Lys	missense	Exon 3 of 13	NP_059430.2	Q15438-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYTH1	ENST00000446868.8	TSL:5 MANE Select	c.138T>G	p.Asn46Lys	missense	Exon 3 of 14	ENSP00000389095.3	Q15438-1
	CYTH1	ENST00000589768.6	TSL:3	c.144T>G	p.Asn48Lys	missense	Exon 3 of 13	ENSP00000467052.2	K7ENQ8
	CYTH1	ENST00000591455.5	TSL:2	c.138T>G	p.Asn46Lys	missense	Exon 3 of 13	ENSP00000465665.1	Q15438-2

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152196 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461368 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727032

African (AFR) AF: 0.0000299 AC: 1 AN: 33416

American (AMR) AF: 0.00 AC: 0 AN: 44572

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

East Asian (EAS) AF: 0.00 AC: 0 AN: 39668

South Asian (SAS) AF: 0.00 AC: 0 AN: 86190

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53396

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111868

Other (OTH) AF: 0.00 AC: 0 AN: 60374

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000657 AC: 1 AN: 152196 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74352

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000241 AC: 1 AN: 41436

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5204

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68038

Other (OTH) AF: 0.00 AC: 0 AN: 2094

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	22
DANN	Benign	0.93
DEOGEN2	Benign	0.13	T
Eigen	Benign	-0.35
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.0098	T
MetaRNN	Benign	0.16	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.4	L
PhyloP100		3.7
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-0.43	N
REVEL	Benign	0.11
Sift	Benign	0.77	T
Sift4G	Benign	0.47	T
Polyphen		0.0	B
Vest4		0.48
MutPred		0.32		Gain of ubiquitination at N46 (P = 0.0077)
MVP		0.55
MPC		0.71
ClinPred		0.33	T
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.18
gMVP		0.18

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

Other links and lift over

dbSNP: rs145550753; hg19: chr17-76704311;