6-32396201-C-T

Position:

• chr6-32396201-C-T

Variant summary

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

The NM_001304561.2(BTNL2):​c.916G>A​(p.Ala306Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,780 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BTNL2 NM_001304561.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.499

Genes affected

BTNL2 (HGNC:1142): (butyrophilin like 2) This gene encodes a major histocompatibility complex, class II associated, type I transmembrane protein which belongs to the butyrophilin-like B7 family of immunoregulators. It is thought to be involved in immune surveillance, serving as a negative T-cell regulator by decreasing T-cell proliferation and cytokine release. The encoded protein contains an N-terminal signal peptide, two pairs of immunoglobulin-like domains, separated by a heptad peptide sequence, and a C-terminal transmembrane domain. Naturally occurring mutations in this gene are associated with sarcoidosis, rheumatoid arthritis, ulcerative colitis, inflammatory bowel disease, myositis, type 1 diabetes, systemic lupus erythematosus, acute coronary syndrome, and prostate cancer. [provided by RefSeq, May 2017]

TSBP1-AS1 (HGNC:39756): (TSBP1 and BTNL2 antisense RNA 1)

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=0.093043715).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BTNL2	NM_001304561.2	c.916G>A	p.Ala306Thr	missense_variant	5/8	ENST00000454136.8
TSBP1-AS1	NR_136245.1	n.303-9253C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BTNL2	ENST00000454136.8	c.916G>A	p.Ala306Thr	missense_variant	5/8	5	NM_001304561.2	P1
TSBP1-AS1	ENST00000645134.1	n.627+5448C>T		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460780 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 726704

Gnomad4 AFR exome AF: 0.0000299

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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 27, 2022

The c.916G>A (p.A306T) alteration is located in exon 5 (coding exon 5) of the BTNL2 gene. This alteration results from a G to A substitution at nucleotide position 916, causing the alanine (A) at amino acid position 306 to be replaced by a threonine (T). 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	0.085
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	12
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0090	T;T;.
Eigen	Benign	-0.41
Eigen_PC	Benign	-0.55
FATHMM_MKL	Benign	0.049	N
M_CAP	Benign	0.0065	T
MetaRNN	Benign	0.093	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.6	.;L;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-1.2	.;N;N
REVEL	Benign	0.054
Sift	Benign	0.73	.;T;T
Sift4G	Benign	0.25	T;T;T
Polyphen		0.76	.;P;.
Vest4		0.048
MutPred		0.35		Gain of disorder (P = 0.1885);Gain of disorder (P = 0.1885);.;
MVP		0.65
MPC		0.39
ClinPred		0.40	T
GERP RS		0.11
Varity_R		0.044
gMVP		0.17

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

Other links and lift over

dbSNP: rs1776441449; hg19: chr6-32363978;