Genetic Variant FAM221B:p.Arg264Gln (chr9-35819952-C-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_001012446.4(FAM221B):c.791G>A(p.Arg264Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000799 in 1,614,078 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 0.00041 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000046 ( 0 hom. )

Consequence

FAM221B
NM_001012446.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.507

Variant links:

Genes affected

FAM221B (HGNC:30762): (family with sequence similarity 221 member B)

FAM221B links:

ENSG00000285645 (HGNC:):

ENSG00000285645 links:

TMEM8B (HGNC:21427): (transmembrane protein 8B) Involved in cell-matrix adhesion. Located in cell surface and plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

TMEM8B links:

Genome browser will be placed here

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 (MetaRNN=0.01970768).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAM221B	NM_001012446.4 link	c.791G>A	p.Arg264Gln	missense_variant	Exon 4 of 7	ENST00000423537.7	NP_001012448.2	A6H8Z2-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
FAM221B	ENST00000423537.7 link	c.791G>A	p.Arg264Gln	missense_variant	Exon 4 of 7	1	NM_001012446.4	ENSP00000415299.2	A6H8Z2-1
ENSG00000285645	ENST00000650284.1 link	n.-19G>A		non_coding_transcript_exon_variant	Exon 3 of 10			ENSP00000498023.1	A0A3B3IU11
ENSG00000285645	ENST00000650284.1 link	n.-19G>A		5_prime_UTR_variant	Exon 3 of 10			ENSP00000498023.1	A0A3B3IU11

Frequencies

GnomAD3 genomes

AF:

0.000408

AC:

AN:

152112

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00145

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:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000132

AC:

AN:

249560

Hom.:

AF XY:

0.0000739

AC XY:

AN XY:

135402

show subpopulations

Gnomad AFR exome

AF:

0.00168

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000111

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.0000458

AC:

AN:

1461848

Hom.:

Cov.:

AF XY:

0.0000344

AC XY:

AN XY:

727230

show subpopulations

Gnomad4 AFR exome

AF:

0.00155

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000630

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.000407

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.000336

AC XY:

AN XY:

74414

show subpopulations

Gnomad4 AFR

AF:

0.00144

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000195

Hom.:

Bravo

AF:

0.000472

ESP6500AA

AF:

0.00157

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000116

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 01, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.791G>A (p.R264Q) alteration is located in exon 4 (coding exon 3) of the FAM221B gene. This alteration results from a G to A substitution at nucleotide position 791, causing the arginine (R) at amino acid position 264 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.49

BayesDel_noAF

Benign

-0.49

CADD

Benign

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.024

T;.

Eigen

Uncertain

0.26

Eigen_PC

Benign

0.18

FATHMM_MKL

Benign

0.24

LIST_S2

Benign

0.78

T;T

M_CAP

Benign

0.014

MetaRNN

Benign

0.020

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.4

M;.

PrimateAI

Benign

0.32

PROVEAN

Uncertain

-3.6

D;D

REVEL

Benign

0.14

Sift

Benign

0.049

D;D

Sift4G

Pathogenic

0.0

D;.

Polyphen

1.0

D;.

Vest4

0.36

MVP

0.17

MPC

0.25

ClinPred

0.13

GERP RS

3.6

Varity_R

0.24

gMVP

0.58

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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